如何在mootools lazyload中加載常規圖像

Question

大衛·沃爾什（David Walsh）的懶惰存在這個問題，有些人似乎對此感到困惑。

我不希望頁面上的每個圖像都延遲加載，而事實是，沒有'data-src'但僅帶有'src'的圖像根本不會加載。

我嘗試將“容器：窗口”選項替換為“容器：'mydiv”，但是延遲加載代碼仍適用於整個頁面。

您是否可以在代碼中添加一些內容，以便lazyload僅在看到帶有data-scr的圖像時才起作用？

    var LazyLoad = new Class({
        Implements: [Options,Events],

        /* additional options */
        options: {
            range: 200,
            elements: "img",
            container: window,
            mode: "vertical",
            realSrcAttribute: "data-src",
            useFade: true
        },

        /* initialize */
        initialize: function(options) {

            // Set the class options
            this.setOptions(options);

            // Elementize items passed in
            this.container = document.id(this.options.container);
            this.elements = $$(this.options.elements);

            // Set a variable for the "highest" value this has been
            this.largestPosition = 0;

            // Figure out which axis to check out
            var axis = (this.options.mode == "vertical" ? "y": "x");

            // Calculate the offset
            var offset = (this.container != window && this.container != document.body ? this.container : "");

            // Find elements remember and hold on to
            this.elements = this.elements.filter(function(el) {
                // Make opacity 0 if fadeIn should be done
                if(this.options.useFade) el.setStyle("opacity",0);
                // Get the image position
                var elPos = el.getPosition(offset)[axis];
                // If the element position is within range, load it
                if(elPos < this.container.getSize()[axis] + this.options.range) {
                    this.loadImage(el);
                    return false;
                }
                return true;
            },this);

            // Create the action function that will run on each scroll until all images are loaded
            var action = function(e) {

                // Get the current position
                var cpos = this.container.getScroll()[axis];

                // If the current position is higher than the last highest
                if(cpos > this.largestPosition) {

                    // Filter elements again
                    this.elements = this.elements.filter(function(el) {

                        // If the element is within range...
                        if((cpos + this.options.range + this.container.getSize()[axis]) >= el.getPosition(offset)[axis]) {

                            // Load the image!
                            this.loadImage(el);
                            return false;
                        }
                        return true;

                    },this);

                    // Update the "highest" position
                    this.largestPosition = cpos;
                }

                // relay the class" scroll event
                this.fireEvent("scroll");

                // If there are no elements left, remove the action event and fire complete
                if(!this.elements.length) {
                    this.container.removeEvent("scroll",action);
                    this.fireEvent("complete");
                }

            }.bind(this);

            // Add scroll listener
            this.container.addEvent("scroll",action);
        },
        loadImage: function(image) {
            // Set load event for fadeIn
            if(this.options.useFade) {
                image.addEvent("load",function(){
                    image.fade(1);
                });
            }
            // Set the SRC
            image.set("src",image.get(this.options.realSrcAttribute));
            // Fire the image load event
            this.fireEvent("load",[image]);
        }
    });

    /* do it! */
        window.addEvent("domready",function() {
            var lazyloader = new LazyLoad({/*
                onScroll: function() { console.warn("scroll!"); },
                onLoad: function(img) { console.warn("load!", img); },
                onComplete: function() { console.warn("complete!"); }
                */
            });
        });

和HTML

<img src="/images/lazy/blank.gif" data-src="/images/lazy/mypic.jpg"></img>

編輯：（此代碼替換'// Elementize傳入的項解決了該問題...但創建了另一個.... lazyload未在滾動上加載圖像。而是在加載頁面時全部加載）

 this.container = document.id(this.options.container);
 this.elements = document.id(this.container == window ? document.body :   
 this.container).getElements(this.options.elements);

Answer 1

好。 看代碼：

      // Elementize items passed in
        this.container = document.id(this.options.container);
        this.elements = $$(this.options.elements);

看起來好像沒有在引用該容器。

改成：

      // Elementize items passed in
        this.container = document.id(this.options.container);
        this.elements = this.container.getElements(this.options.elements);

並確保options.elements是一個明智的選擇器。