added fallback mechanic to imageviewer.js
This commit is contained in:
partisan
parent
5881fa76e0
commit
d8ebe94657
3 changed files with 207 additions and 189 deletions
174
static/js/dynamicscrollingimages.js
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174
static/js/dynamicscrollingimages.js
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@ -0,0 +1,174 @@
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(function() {
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// Configuration
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const imageStatusInterval = 500; // Interval in milliseconds to check image status
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const scrollThreshold = 500; // Distance from bottom of the page to trigger loading
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let isFetching = false;
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let page = parseInt(document.getElementById('template-data').getAttribute('data-page')) || 1;
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let query = document.getElementById('template-data').getAttribute('data-query');
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let hardCacheEnabled = document.getElementById('template-data').getAttribute('data-hard-cache-enabled') === 'true';
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let noMoreImages = false; // Flag to indicate if there are no more images to load
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let imageElements = [];
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let imageIds = [];
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/**
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* Function to handle image load errors with retry logic
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* @param {HTMLElement} imgElement - The image element that failed to load
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* @param {number} retryCount - Number of retries left
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* @param {number} retryDelay - Delay between retries in milliseconds
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*/
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function handleImageError(imgElement, retryCount = 3, retryDelay = 1000) {
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if (retryCount > 0) {
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setTimeout(() => {
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imgElement.src = imgElement.getAttribute('data-full');
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imgElement.onerror = function() {
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handleImageError(imgElement, retryCount - 1, retryDelay);
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};
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}, retryDelay);
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} else {
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// After retries, hide the image container or set a fallback image
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console.warn('Image failed to load after retries:', imgElement.getAttribute('data-full'));
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imgElement.parentElement.style.display = 'none'; // Hide the image container
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// Alternatively, set a fallback image:
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// imgElement.src = '/static/images/fallback.svg';
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}
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}
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/**
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* Function to ensure the page is scrollable by loading more images if necessary
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*/
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function ensureScrollable() {
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if (noMoreImages) return; // Do not attempt if no more images are available
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// Check if the page is not scrollable
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if (document.body.scrollHeight <= window.innerHeight) {
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// If not scrollable, fetch the next page
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fetchNextPage();
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}
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}
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/**
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* Function to fetch the next page of images
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*/
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function fetchNextPage() {
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if (isFetching || noMoreImages) return;
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isFetching = true;
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page += 1;
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fetch(`/search?q=${encodeURIComponent(query)}&t=image&p=${page}&ajax=true`)
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.then(response => response.text())
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.then(html => {
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// Parse the returned HTML and extract image elements
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let parser = new DOMParser();
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let doc = parser.parseFromString(html, 'text/html');
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let newImages = doc.querySelectorAll('.image');
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if (newImages.length > 0) {
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let resultsContainer = document.querySelector('.images');
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newImages.forEach(imageDiv => {
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// Append new images to the container
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resultsContainer.appendChild(imageDiv);
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// Get the img element
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let img = imageDiv.querySelector('img');
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if (img) {
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if (hardCacheEnabled) {
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// Replace image with placeholder
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img.src = '/static/images/placeholder.svg';
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img.onerror = function() {
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handleImageError(img);
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};
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let id = img.getAttribute('data-id');
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if (id) { // Only include if ID is not empty
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imageElements.push(img);
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imageIds.push(id);
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}
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}
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}
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});
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if (hardCacheEnabled) {
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checkImageStatus();
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}
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// After appending new images, ensure the page is scrollable
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ensureScrollable();
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} else {
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// No more images to load
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noMoreImages = true;
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}
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isFetching = false;
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})
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.catch(error => {
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console.error('Error fetching next page:', error);
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isFetching = false;
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});
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}
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/**
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* Function to check image status via AJAX
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*/
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function checkImageStatus() {
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if (!hardCacheEnabled) return;
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if (imageIds.length === 0) {
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// No images to check, do nothing
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return;
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}
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// Send AJAX request to check image status
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fetch(`/image_status?image_ids=${imageIds.join(',')}`)
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.then(response => response.json())
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.then(statusMap => {
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imageElements = imageElements.filter(img => {
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let id = img.getAttribute('data-id');
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if (statusMap[id]) {
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// Image is ready, update src
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img.src = statusMap[id];
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img.onerror = function() {
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handleImageError(img);
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};
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// Remove the image id from the list
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imageIds = imageIds.filter(imageId => imageId !== id);
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return false; // Remove img from imageElements
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}
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return true; // Keep img in imageElements
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});
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// After updating images, ensure the page is scrollable
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ensureScrollable();
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})
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.catch(error => {
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console.error('Error checking image status:', error);
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});
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}
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// Initialize imageElements and imageIds
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if (hardCacheEnabled) {
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imageElements = Array.from(document.querySelectorAll('img[data-id]'));
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imageIds = imageElements
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.map(img => img.getAttribute('data-id'))
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.filter(id => id); // Exclude empty IDs
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// Replace images with placeholders
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imageElements.forEach(img => {
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img.src = '/static/images/placeholder.svg';
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});
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// Start checking image status
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let imageStatusTimer = setInterval(checkImageStatus, imageStatusInterval);
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checkImageStatus(); // Initial check
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// After initial images are loaded, ensure the page is scrollable
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window.addEventListener('load', ensureScrollable);
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}
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// Infinite scrolling
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window.addEventListener('scroll', function() {
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if (isFetching || noMoreImages) return;
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if (window.innerHeight + window.scrollY >= document.body.offsetHeight - scrollThreshold) {
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// User scrolled near the bottom
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fetchNextPage();
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}
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});
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// Remove 'js-enabled' class from content
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document.getElementById('content').classList.remove('js-enabled');
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})();
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@ -60,10 +60,29 @@ document.addEventListener('DOMContentLoaded', function() {
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const imgElement = imageList[index];
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const imgElement = imageList[index];
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const parentImageDiv = imgElement.closest('.image');
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const parentImageDiv = imgElement.closest('.image');
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const fullImageUrl = imgElement.getAttribute('data-full'); // Use data-full for the full image URL
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const title = imgElement.alt || '';
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const sourceUrl = parentImageDiv.querySelector('.img_source').href || '#'; // Source webpage URL
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if (!parentImageDiv) {
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console.warn('Parent image div not found');
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return;
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}
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// Use the `data-full` attribute for the full image URL
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let fullImageUrl = imgElement.getAttribute('data-full') || imgElement.src;
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const title = imgElement.alt || 'Untitled';
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// Gracefully handle the source URL or other attributes
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const sourceElement = parentImageDiv.querySelector('.img_source');
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const sourceUrl = sourceElement ? sourceElement.href : null;
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// Fallback logic: if sourceUrl is null, use `data-proxy-full` or a meaningful default
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const proxyFullUrl = imgElement.getAttribute('data-proxy-full') || fullImageUrl;
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// Check if full image is missing, fallback to proxy size
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if (fullImageUrl === '/static/images/missing.svg') {
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fullImageUrl = proxyFullUrl;
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}
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// Elements in the viewer
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const viewerImage = document.getElementById('viewer-image');
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const viewerImage = document.getElementById('viewer-image');
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const viewerTitle = document.getElementById('viewer-title');
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const viewerTitle = document.getElementById('viewer-title');
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const viewerSourceButton = document.getElementById('viewer-source-button');
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const viewerSourceButton = document.getElementById('viewer-source-button');
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@ -71,13 +90,14 @@ document.addEventListener('DOMContentLoaded', function() {
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const proxySizeLink = document.getElementById('viewer-proxy-size-link');
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const proxySizeLink = document.getElementById('viewer-proxy-size-link');
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const viewerImageLink = document.getElementById('viewer-image-link');
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const viewerImageLink = document.getElementById('viewer-image-link');
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// Set the viewer image to the full image URL
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// Assign values to the viewer elements
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viewerImage.src = fullImageUrl;
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viewerImage.src = fullImageUrl; // Full-size image in the viewer
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viewerTitle.textContent = title;
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viewerTitle.textContent = title;
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viewerSourceButton.href = sourceUrl;
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fullSizeLink.href = sourceUrl; // Link to the source website
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viewerSourceButton.href = sourceUrl || proxyFullUrl; // Use proxy URL if source is missing
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proxySizeLink.href = fullImageUrl; // Link to the proxied full-size image
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fullSizeLink.href = sourceUrl || proxyFullUrl; // Link to source website or proxy
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viewerImageLink.href = fullImageUrl; // Make image clickable to open in new tab
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proxySizeLink.href = fullImageUrl; // Link to the proxied full-size image
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viewerImageLink.href = fullImageUrl; // Make image clickable to open in a new tab
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}
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}
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// Attach event listener to the document body
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// Attach event listener to the document body
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@ -152,182 +152,6 @@
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<script defer src="/static/js/autocomplete.js"></script>
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<script defer src="/static/js/autocomplete.js"></script>
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<script defer src="/static/js/imagetitletrim.js"></script>
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<script defer src="/static/js/imagetitletrim.js"></script>
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<script defer src="/static/js/imageviewer.js"></script>
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<script defer src="/static/js/imageviewer.js"></script>
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<!-- JavaScript to Load Images and Dynamic loading of the page -->
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<script defer src="/static/js/dynamicscrollingimages.js"></script>
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<script>
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(function() {
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// Configuration
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const imageStatusInterval = 500; // Interval in milliseconds to check image status
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const scrollThreshold = 500; // Distance from bottom of the page to trigger loading
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let isFetching = false;
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let page = parseInt(document.getElementById('template-data').getAttribute('data-page')) || 1;
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let query = document.getElementById('template-data').getAttribute('data-query');
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let hardCacheEnabled = document.getElementById('template-data').getAttribute('data-hard-cache-enabled') === 'true';
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let noMoreImages = false; // Flag to indicate if there are no more images to load
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let imageElements = [];
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let imageIds = [];
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/**
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* Function to handle image load errors with retry logic
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* @param {HTMLElement} imgElement - The image element that failed to load
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* @param {number} retryCount - Number of retries left
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* @param {number} retryDelay - Delay between retries in milliseconds
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*/
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function handleImageError(imgElement, retryCount = 3, retryDelay = 1000) {
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if (retryCount > 0) {
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setTimeout(() => {
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imgElement.src = imgElement.getAttribute('data-full');
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imgElement.onerror = function() {
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handleImageError(imgElement, retryCount - 1, retryDelay);
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};
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}, retryDelay);
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} else {
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// After retries, hide the image container or set a fallback image
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console.warn('Image failed to load after retries:', imgElement.getAttribute('data-full'));
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imgElement.parentElement.style.display = 'none'; // Hide the image container
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// Alternatively, set a fallback image:
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// imgElement.src = '/static/images/fallback.svg';
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}
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}
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/**
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* Function to ensure the page is scrollable by loading more images if necessary
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*/
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function ensureScrollable() {
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if (noMoreImages) return; // Do not attempt if no more images are available
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// Check if the page is not scrollable
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if (document.body.scrollHeight <= window.innerHeight) {
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// If not scrollable, fetch the next page
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fetchNextPage();
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}
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}
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/**
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* Function to fetch the next page of images
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*/
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function fetchNextPage() {
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if (isFetching || noMoreImages) return;
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isFetching = true;
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page += 1;
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fetch(`/search?q=${encodeURIComponent(query)}&t=image&p=${page}&ajax=true`)
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.then(response => response.text())
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.then(html => {
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// Parse the returned HTML and extract image elements
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let parser = new DOMParser();
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let doc = parser.parseFromString(html, 'text/html');
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let newImages = doc.querySelectorAll('.image');
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if (newImages.length > 0) {
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let resultsContainer = document.querySelector('.images');
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newImages.forEach(imageDiv => {
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// Append new images to the container
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resultsContainer.appendChild(imageDiv);
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// Get the img element
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let img = imageDiv.querySelector('img');
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if (img) {
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if (hardCacheEnabled) {
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// Replace image with placeholder
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img.src = '/static/images/placeholder.svg';
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img.onerror = function() {
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handleImageError(img);
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};
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let id = img.getAttribute('data-id');
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if (id) { // Only include if ID is not empty
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imageElements.push(img);
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imageIds.push(id);
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}
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}
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}
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});
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if (hardCacheEnabled) {
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checkImageStatus();
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}
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// After appending new images, ensure the page is scrollable
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ensureScrollable();
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} else {
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// No more images to load
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noMoreImages = true;
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}
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isFetching = false;
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})
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.catch(error => {
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console.error('Error fetching next page:', error);
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isFetching = false;
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});
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}
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/**
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* Function to check image status via AJAX
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*/
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function checkImageStatus() {
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if (!hardCacheEnabled) return;
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if (imageIds.length === 0) {
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// No images to check, do nothing
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return;
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}
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// Send AJAX request to check image status
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fetch(`/image_status?image_ids=${imageIds.join(',')}`)
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.then(response => response.json())
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.then(statusMap => {
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imageElements = imageElements.filter(img => {
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let id = img.getAttribute('data-id');
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if (statusMap[id]) {
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// Image is ready, update src
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img.src = statusMap[id];
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img.onerror = function() {
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handleImageError(img);
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};
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// Remove the image id from the list
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imageIds = imageIds.filter(imageId => imageId !== id);
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return false; // Remove img from imageElements
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}
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return true; // Keep img in imageElements
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});
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// After updating images, ensure the page is scrollable
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ensureScrollable();
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})
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.catch(error => {
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console.error('Error checking image status:', error);
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});
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}
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// Initialize imageElements and imageIds
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if (hardCacheEnabled) {
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imageElements = Array.from(document.querySelectorAll('img[data-id]'));
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imageIds = imageElements
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|
||||||
.map(img => img.getAttribute('data-id'))
|
|
||||||
.filter(id => id); // Exclude empty IDs
|
|
||||||
|
|
||||||
// Replace images with placeholders
|
|
||||||
imageElements.forEach(img => {
|
|
||||||
img.src = '/static/images/placeholder.svg';
|
|
||||||
});
|
|
||||||
|
|
||||||
// Start checking image status
|
|
||||||
let imageStatusTimer = setInterval(checkImageStatus, imageStatusInterval);
|
|
||||||
checkImageStatus(); // Initial check
|
|
||||||
|
|
||||||
// After initial images are loaded, ensure the page is scrollable
|
|
||||||
window.addEventListener('load', ensureScrollable);
|
|
||||||
}
|
|
||||||
|
|
||||||
// Infinite scrolling
|
|
||||||
window.addEventListener('scroll', function() {
|
|
||||||
if (isFetching || noMoreImages) return;
|
|
||||||
|
|
||||||
if (window.innerHeight + window.scrollY >= document.body.offsetHeight - scrollThreshold) {
|
|
||||||
// User scrolled near the bottom
|
|
||||||
fetchNextPage();
|
|
||||||
}
|
|
||||||
});
|
|
||||||
|
|
||||||
// Remove 'js-enabled' class from content
|
|
||||||
document.getElementById('content').classList.remove('js-enabled');
|
|
||||||
})();
|
|
||||||
</script>
|
|
||||||
</body>
|
</body>
|
||||||
</html>
|
</html>
|
||||||
Loading…
Add table
Reference in a new issue