使用PHP和jQuery preloading图像 - 逗号分隔的数组？ [英] Preloading images using PHP and jQuery - Comma seperated array?

问题描述

所以我建立一个网站，将使用大量GIF动画的的鼠标悬停。将有大量的图片，我只想要加载，将任何给定的页面上使用的图像。它使用Word preSS所以我可以使用条件标签来只放了，我需要的某一页上的图像的URL的。

So I'm building a website that will use a lot of animated GIF's on mouse hover. There will be a lot of images, and I only want to load the images that will be used on any given page. It's using WordPress so I can use the conditional tags to only put out the URL's of the images I need on a certain page.

我的问题是如何分辨哪些图像需要的是preloaded浏览器/服务器。我决定一个HTML5数据属性添加到包含的元素。

My problem was how to tell the browser/server which images needed to be preloaded. I decided to add a HTML5 data attribute to the containing element.

例如，我将有一个DIV与此PHP中的：

For example, I would have a DIV with this PHP in it:

<div id="home-container" class="preload" data-preload="<?php echo preloadImages(); ?>"></div>

这将调用该函数在PHP中：

Which would call this function in PHP:

function preloadImages() {
    global $post;
    $templateURL = get_template_directory_uri();
    $images = array();

    if( is_page('test') )
        $images[] = "'".$templateURL."/images/gifs-static/button-info-tab-close-off.gif'";
        $images[] = "'".$templateURL."/images/gifs-animated/button-info-tab-close.gif'";
    }

    return implode(", ", $images);
}

所以输出会是这样的：

So the output would be this:

<div id="home-container" class="preload" data-preload="'http://example.com/images/gifs-static/button-info-tab-close-off.gif', 'http://example.com/images/gifs-animated/button-info-tab-close.gif'"></div>

然后我运行这段JavaScript：

And then I run this JavaScript:

jQuery('.preload').each(function(){

        var images = [
            // Comma seperated list
            jQuery(this).data('preload')
        ];

        jQuery(images).each(function() {
            jQuery('<img />').attr('src', this).addClass('preloaded').appendTo('body').hide();
        });
});

问题是，JavaScript的不喜欢逗号分隔的列表。如果我只是在写的网址，它工作正常。那么，有没有更好的办法在这些网址通过？或一般的更好的办法？

The problem is that the JavaScript does not like the comma separated list. If I just write in the URLs, it works fine. So is there a better way to pass in those URLs? Or a better way in general?

谢谢！

推荐答案

您需要的deliminator逗号分割的URL字符串到一个数组：

You need to split the string of URLs by the deliminator commas into an array:

    var images = jQuery(this).data('preload').split(',');

的jQuery（本）。数据（'preLOAD'）返回一个字符串，你可以使用 .split（）到字符串分割成一个数组：的https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Split

jQuery(this).data('preload') is returning a string, and you can use .split() to split that string into an array: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/Split

你也可以让你的循环运行快一点通过使用 $每（）：

Also you can make your loop run a little faster by using $.each():

jQuery('.preload').each(function(){

        var images = [
            // Comma seperated list
            jQuery(this).data('preload')
        ];

        jQuery.each(images, function() {
            jQuery('<img />').attr('src', this).addClass('preloaded').appendTo('body').hide();
        });
});

请注意，你不应该有比在数据属性分开不同的URL逗号以外的任何：

Note that you shouldn't have anything other than the commas that separate the different urls in the data-attribute:

<div id="home-container" class="preload" data-preload="http://example.com/images/gifs-static/button-info-tab-close-off.gif,http://example.com/images/gifs-animated/button-info-tab-close.gif"></div>

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