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，我只想将其内容加载到移动设备上。

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

不知道为什么这被否决了。一个简单的 jQuery 插件就可以解决问题：

(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，但我想您可能需要进行的唯一更改涉及对 $.ajax 的调用。

Answer 2

尝试给 html 元素一个默认样式 display:none;以及在 JS 移动检测（实际上是手持）脚本中返回的 id，例如：

if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
  $('#yourID').removeAttr('style');
}

我个人会使用像 Mobile Detect (https://github.com/serbanghita/Mobile-Detect) 这样的服务器端 PHP 类，并将设备类型（无论是移动设备还是平板电脑）放入会话中，以便在您想要的任何地方使用它。

Answer 3

第一个解决方案是使用单独的 ajax 请求来加载特定内容，前提是设备恰好是移动设备。

   if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|OperaMini/i.test(navigator.userAgent)){
    ...#Ajax request here to load the section content
   }

如果需要，第二种方法可以在后端处理。发送到服务器的请求可用于获取有关用户代理的信息。如果是轨道

request.env["HTTP_USER_AGENT"]

用于检测使用的用户代理。这可用于与上述移动设备进行比较。仅当请求来自移动设备时，才能呈现部分内容。

<% if mobile? %>
 <section>
 </section>
<% end %>

Answer 4

此代码检查所有可能的移动设备

var mobile = (function (b) {
    var a = navigator.userAgent || navigator.vendor || window.opera;
    if (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4))) return true;
})();

    if (mobile === true){
     // show mobile content here
     // example:
     $.ajax({
     url: "mobilecontent.html"
     }).done(function() {
       $('#mobilecontainer').html(data);
     });
}

代码与detectmobilebrowsers略有不同