浏览器下载页面时是否可以显示Twitter Bootstrap Progress栏?

时间:2013-03-04 20:32:25

标签: javascript jquery twitter-bootstrap

我有一个包含大量大图片的网站,我想在加载所有内容时显示一个Twitter引导进度条。

有可能这样做吗? jquery是否有办法跟踪页面加载的进度?

我想显示一个进度条,直到所有的css,js和图像等都被下载。

1 个答案:

答案 0 :(得分:1)

您可以尝试这样的事情:

HTML

<div class="progress progress-striped active">
    <div class="bar"></div>
</div>

<div class="imagelist">
    <img src="http://studio7designs.com/wp-content/uploads/green-grass.jpeg"/>
    <img src="http://studio7designs.com/wp-content/uploads/rowboat-600x398.jpg"/>
    <img src="http://studio7designs.com/wp-content/uploads/blue-wheat-grass.jpeg"/>
    <img src="http://studio7designs.com/wp-content/uploads/rocks.jpg"/>
    <img src="http://studio7designs.com/wp-content/uploads/sun-grass-golden.jpg"/>
    <img src="http://studio7designs.com/wp-content/uploads/blue-water-photo.jpg"/>
    <img src="http://studio7designs.com/wp-content/uploads/flight.jpg"/>
</div>

的Javascript

$.fn.imagesLoaded = function (callback, onEach) {
    var elems = this.filter('img'),
        len = elems.length,
        blank = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";

    elems.bind('load.imgloaded', function () {
        if(typeof onEach === 'function'){
            onEach(len, elems.length); // runs on every image load
        }

        if (--len <= 0 && this.src !== blank) {
            elems.unbind('load.imgloaded');
            callback.call(elems, this);
        }
    }).each(function () {
        // cached images don't fire load sometimes, so we reset src.
        if (this.complete || this.complete === undefined) {
            var src = this.src;
            // webkit hack from http://groups.google.com/group/jquery-dev/browse_thread/thread/eee6ab7b2da50e1f
            // data uri bypasses webkit log warning (thx doug jones)
            this.src = blank;
            this.src = src;
        }
    });

    return this;
};

$(document).ready(function () {
    var progress = $('.progress');
    var progressbar = progress.children('.bar');

    $('.imagelist img').imagesLoaded(function () {
        progressbar.width('100%');
        progress.fadeOut();
    }, function (left, total) {
        progressbar.width((total - left) / total * 100 + '%');
    });
});

我使用了Paul Irish编写的.imagesLoaded()代码,并添加了每次加载图像时触发的附加回调。因此,对于每个加载的图像,进度条都会进行。

它并不完全准确,因为它不会跟踪加载任何特定文件的数量,并且我不完全确定可以在不使此代码复杂化的情况下进行,因此进度条仅在加载图像时而不是在加载时更改它正在加载。

我希望这会有所帮助。