jquery - 仅在模式打开后加载图像

Question

我有一个很大的盒子网格。每个框都会打开一个模式。每个模态里面都有图像。

问题是页面加载所有图像并且需要很长时间。如何让它仅在打开特定模式时加载模式的图像？也许还有一个旋转gif？

我正在使用 custombox.js 插件。

$(document).ready(function() {
    $('.info').on('click', function(e) {
        Custombox.open({
            target: $(this).data('href'),
            effect: 'push',
            speed: 500,
            overlayColor: '#2C3E50',
            overlayClose: false,
            //overlayEffect: '',
            //overlayOpacity: 1,
        });
        e.preventDefault();
    });
});

编辑:示例模式代码

<div id="modal57" class="modal">
    <div id="portfolioItemClose" class="close"><span></span>
    </div>
    <div class="portfolioTitle wow fadeInLeft" data-wow-delay=".5s" data-wow-duration=".3s">ikuw solutions
    </div>
    <div class="portfolioImageBodyContainer">
        <div class="portfolioImage wow rotateIn" data-wow-delay=".3s" data-wow-duration=".3s">
            <div id="gallery" class="">
                <div class="content">
                    <img data-src="../../../../../assets/images/portfolio/brochures-flyers/20150102_ikuw_flyer-tech_oracle-pl-sql-tips-techniques_1.jpg" class="image_1">
                    <img data-src="../../../../../assets/images/portfolio/brochures-flyers/20150102_ikuw_flyer-tech_oracle-pl-sql-tips-techniques_2.jpg" class="image_2" style="display:none;">
                </div>
            </div>
        </div>
        <div class="portfolioBody wow fadeInDown" data-wow-delay=".5s" data-wow-duration=".3s">
            <div class="portfolioClientDescriptionUsage">
                <div class="portfolioBodyClient wow fadeIn" data-wow-delay=".8s">ikuw solutions</div>
                <div class="portfolioBodyDescription wow fadeIn" data-wow-delay=".9s">PL/SQL tips &amp; techniques flyer</div>
                <div class="portfolioBodyUsage wow fadeIn" data-wow-delay="1s">students</div>
            </div>
            <div class="portfolioBodyText wow fadeIn" data-wow-delay="1.1s">[text]</div>
            <div class="portfolioBodyPDF wow fadeIn" data-wow-delay="1.1s"><a href="../../../../../assets/images/portfolio/brochures-flyers/20150102_ikuw_flyer-tech_oracle-pl-sql-tips-techniques.pdf" target="_blank">View full-scale PDF&nbsp;&nbsp;<span class="fa fa-angle-right"></span></a></div>
            <div class="portfolioBodyLine wow zoomIn" data-wow-delay="1.2s" data-wow-duration=".3s"></div>
            <div class="portfolioBodyVersions wow fadeIn" data-wow-delay="1.3s">pages</div>
            <div class="thumbnail">
                <div class="thumb wow bounceIn" data-wow-delay="1.5s"><a href="#" rel="1"><img data-src="../../../../../assets/images/portfolio/brochures-flyers/thumb_20150102_ikuw_flyer-tech_oracle-pl-sql-tips-techniques_1.jpg" id="thumb_1" class="fit"></a></div>
                <div class="thumb wow bounceIn" data-wow-delay="1.6s"><a href="#" rel="2"><img data-src="../../../../../assets/images/portfolio/brochures-flyers/thumb_20150102_ikuw_flyer-tech_oracle-pl-sql-tips-techniques_2.jpg" id="thumb_2" class="fit"></a></div>
            </div>
        </div>
    </div>
</div>

Answer 1

解决方案是在加载时删除所有模态框图像源并将其值保留在属性 data-src 中。然后，当您打开模态窗口时，您可以通过相应的 data-src 值将源设置为仅打开的模态图像。类似这样的事情:

$(document).ready(function () {
    // Considering that your modal divs have a class 'modal'
    $(".modal img").not(":visible").each(function () {
        $(this).data("src", this.src);
        this.src = "";
        // or remove the whole attribute with $(this).removeAttr("src")
    });

    // Set an attribute `data-sourcesAreSet` to each modal div in order to prevent setting the images sources if they are already set
    $(".modal").each(function () {
        $(this).data("sourcesAreSet", false);
    });

    $('.info').on('click', function (e) {

        var correspondingModal = $($(this).data('href'));

        // Only set the images sources if they are not already set.
        if (correspondingModal.data("sourcesAreSet") == false) {
            correspondingModal.find("img").each(function () {
                this.src = $(this).data("src");
                // or add the attribute with $(this).attr("src", $(this).data("src"))
            });
            correspondingModal.data("sourcesAreSet", true);
        }

        Custombox.open({
            target: $(this).data('href'),
            effect: 'push',
            speed: 500,
            overlayColor: '#2C3E50',
            overlayClose: false
        });
        e.preventDefault();
    });
});

以下是适用于上述代码的模式框示例:

<a data-href="#modal" class="info">Click here</a>

<div id="modal" class="modal-demo modal">
    <button type="button" class="close" onclick="Custombox.close();">
        <span>&times;</span><span class="sr-only">Close</span>
    </button>
    <h4 class="title">Modal title</h4>
    <div class="text">
        Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    <img src="Images/example.png" />
    </div>
</div>

如果您还想在加载图像时显示旋转 gif，您可以按照建议执行操作 in this answer对于每个图像，或者，您可以有一个与模态框一样大的 div，其中包含一个旋转 gif，您可以将其隐藏在自定义框的“完整”回调函数中，尽管我不太确定当所有图像都触发此函数时图片已完成加载。