jQuery 加载函数的回调

发布于 2024-10-26 10:13:08 字数 863 浏览 0 评论 0原文

我希望能够在创建元素（图像元素）时回调 .load() 函数。该代码的工作原理是通过以下代码加载新的图像元素：

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
    });
}).attr('src', loadurl);

但我希望能够在加载和替换图像后继续。这就是我需要它工作的方式：

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
    });
}).attr('src', loadurl);

$('.block-wrap input.imageheight').val($('.block-wrap img').height());
$('.block-wrap input.imagewidth').val($('.block-wrap img').width());

它返回第一个图像高度（不是已被替换的图像，它是加载旋转图像），所以我需要它能够在完全加载时检索图像高度和宽度到 DOM 中。太糟糕了 .replaceWith() 没有回调方法，但我无法在 .load() 上使用回调函数，因为它是一个函数，因此无法工作已通过 .load() 函数传递。

原文

I want to be able to do the callback of the .load() function when an element has been created - an image element. The code works by loading a new image element by this code:

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
    });
}).attr('src', loadurl);

But I want to be able to continue when the image has been loaded and replaced. This is how I need it to work:

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
    });
}).attr('src', loadurl);

$('.block-wrap input.imageheight').val($('.block-wrap img').height());
$('.block-wrap input.imagewidth').val($('.block-wrap img').width());

It returns the first image height (not the image that has been replaced which is a loading spinner image), so I need it to be able to retrieve the image height and width when it has fully loaded into the DOM. Too bad .replaceWith() does not have a callback method, but I cannot use a callback function on the .load() since it will not work due to it's a function that has been passed through the .load() function.

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不爱素颜 2024-11-02 10:13:09

它返回错误的图像尺寸，因为 $('.block-wrap img').height() 和 $('.block-wrap img').width() 在 .load() 完成之前被调用。

您可以将这两行放在 load 回调中（在 .replaceWith 之后），以便它们引用正确的图像。

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
        $('.block-wrap input.imageheight').val($('.block-wrap img').height());
        $('.block-wrap input.imagewidth').val($('.block-wrap img').width());
    });
}).attr('src', loadurl);

It's returning the wrong image dimensions, because $('.block-wrap img').height() and $('.block-wrap img').width() are being called before .load() finishes.

You can put those two lines inside the load callback (after the .replaceWith), so that they refer to the correct image.

$('<img />').load(function()
{
    var img = this;
    $('.block-wrap img').fadeOut('slow', function()
    {
        $(this).replaceWith(img);
        $('.block-wrap input.imageheight').val($('.block-wrap img').height());
        $('.block-wrap input.imagewidth').val($('.block-wrap img').width());
    });
}).attr('src', loadurl);

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别靠近我心 2024-11-02 10:13:08

我不是 100% 同意这一点，但是你不能在 ReplaceWith 的末尾添加一个加载事件吗？ IE：

$(this).replaceWith(img).load(function(){

   $('.block-wrap input.imageheight').val($('.block-wrap img').height());
   $('.block-wrap input.imagewidth').val($('.block-wrap img').width());

});

I'm not 100% on this but could you not add a load event to the end of replaceWith? I.E:

$(this).replaceWith(img).load(function(){

   $('.block-wrap input.imageheight').val($('.block-wrap img').height());
   $('.block-wrap input.imagewidth').val($('.block-wrap img').width());

});

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