javascript - 仅在移动设备上加载部分内容

Question

使用的技术:Bootstrap 3.1.1、jQuery 1.11

目标:我有一个部分，我只想在移动设备上加载它的内容。

如果我只使用 Bootstrap 的 visible-sm 和 hidden-lg 类，内容仍会加载到更大的设备/尺寸上，从而产生开销。

我的部分代码如下。我只想在移动设备上加载和显示它的内容。我知道可见类和隐藏类显示和隐藏，但我只想在移动设备上加载它——这是关键。没有开销。

<section id="category-icons" class="row visible-xs visible-sm hidden-md hidden-lg">
    <div class="container White_BG">
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Hand Tools" target="_blank"><img class="img-responsive" src="/images/art/Handtools-cat-sprite.png"></a>         
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Field Production" target="_blank"><img class="img-responsive" src="/images/art/Fieldproduction-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Pruning Tools" target="_blank"><img class="img-responsive" src="/images/art/Pruning-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Material Handling" target="_blank"><img class="img-responsive" src="/images/art/materialhandling-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Safety Equipment" target="_blank"><img class="img-responsive" src="/images/art/safetyequipment-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Sprayers & Spreaders" target="_blank"><img class="img-responsive" src="/images/art/sprayers-spreaders-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Watering & Irrigation" target="_blank"><img class="img-responsive" src="/images/art/watering-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Marking & Tagging" target="_blank"><img class="img-responsive" src="/images/art/markingtagging-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Herbicides & Pesticides" target="_blank"><img class="img-responsive" src="/images/art/herbicides-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Greenhouse Production" target="_blank"><img class="img-responsive" src="/images/art/greenhouse-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Fertilizers & Treatments" target="_blank"><img class="img-responsive" src="/images/art/fertilizers-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Container Production" target="_blank"><img class="img-responsive" src="/images/art/containerproduction-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Pest Control" target="_blank"><img class="img-responsive" src="/images/art/pestcontrol-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Power Equipment" target="_blank"><img class="img-responsive" src="/images/art/powerequipment-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Work Wear" target="_blank"><img class="img-responsive" src="/images/art/workwear-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Turf & Landscape" target="_blank"><img class="img-responsive" src="/images/art/turf-landscape-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Arborist Equipment" target="_blank"><img class="img-responsive" src="/images/art/arborists-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Measuring & Surveying" target="_blank"><img class="img-responsive" src="/images/art/measuring-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Maintenance Supplies" target="_blank"><img class="img-responsive" src="/images/art/maintenance-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Snow Removal" target="_blank"><img class="img-responsive" src="/images/art/snowremoval-cat-sprite.png"></a>
        </div>
        <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
            <a href="/hand-tools/c/P01/" title="Used, Scratch, Dented Items" target="_blank"><img class="img-responsive" src="/images/art/useditems-cat-sprite.png"></a>
        </div>
    </div>
</section>

Answer 1

不确定为什么这会被否决。一个简单的 jQuery 插件就可以做到这一点:

(function(global, $) {

if (!global.matchMedia) {
    throw new Error("This browser does not support matchMedia()");
}

$.fn.lazyLoad = function(overrides) {
    var options = $.extend({}, $.fn.lazyLoad.defaults, overrides || {});

    this.find("[data-lazyload-url]").each(function() {
        var url = this.getAttribute("data-lazyload-url"),
            media = this.getAttribute("data-lazyload-media"),
            $target = $(this).addClass(options.loadingClass);

        if (!media || global.matchMedia(media)) {
            $.ajax(url)
            .done(function(data) {
                $target.html(data);
            })
            .fail(function(xhr, status, error) {
                $target.html("Error: " + xhr.status);
            })
            .always(function() {
                $target.removeClass(options.loadingClass);
            });
        }
    });
};

$.fn.lazyLoad.defaults = {
    loadingClass: "loading"
};

})(this, jQuery);

并使用它:

$(document).lazyLoad();

一些示例 HTML:

<body>
    <div data-lazyload-url="/foo/bar">
        Load for every browser
    </div>
    <div data-lazyload-url="/baz" data-lazyload-media="screen and max-width: 500px">
        Load for 500px and smaller viewports
    </div>
</body>

这使用了最新版本的 jQuery，但我认为您可能需要进行的唯一更改涉及对 $.ajax 的调用。