jQuery遍历每个div

问题描述

我敢肯定，这对于您的jQuery难题将是一个非常简单的答案，而且我也很高兴，它涉及某种循环.

I'm pretty sure this will be a really easy answer for you jQuery whizzes, and I'm also pretty such it involves a loop of some kind.

我试图在两个单独的div上执行基本相同的计算，但是根据找到的图像数为每个id分配不同的CSS宽度值.我正在执行的计算实际上与我的问题无关，但是无论如何我还是把它们放在了一起，因为这是我正在使用的实际代码.

I'm trying to perform essentially the same calculation on two separate divs, but assigning a different CSS width value to each id based on the number of images found. The calculations I'm performing are irrelevant to my problem really, but I put them in anyway because it's the actual code I'm working with.

这里是标记...

<div id ='test1' class='target'>
  <div class='scrolling'>
    <img/>
    <img/>
    <img/>
  </div>
</div>

<div id ='test2' class='target'>
  <div class='scrolling'>
    <img/>
    <img/>
    <img/>
  </div>
</div>

下面是我当前使用的jQuery，它可以正常工作，但是效率低下，因为我必须为添加的每个div编写另一段代码.我该如何对其进行标准化，以使其遍历每个具有目标类的div?谢谢

Below is my current jQuery, which works fine, but it's inefficient because I have to write another chunk of code for every div added. How can I standardise this so that it runs through every div with the class of target? Thanks

/* Measure the width of each image. */
test1 = $('#div1 .scrolling img').width();
test2 = $('#div2 .scrolling img').width();

/* Find out how many images there are. */
test1img = $('#div1 .scrolling img').length;
test2img = $('#div2 .scrolling img').length;

/* Do the maths. */
final1 = (test1 * test1img)*1.2;
final2 = (test2 * test2img)*1.2;

/* Apply the maths to the CSS. */
$('#div1 .scrolling').width(final1);
$('#div2 .scrolling').width(final2);

推荐答案

像这样:

$(".target").each(function(){
    var images = $(this).find(".scrolling img");
    var width = images.width();
    var imgLength = images.length;
    $(this).find(".scrolling").width( width * imgLength * 1.2 );
});

$(this)表示将循环通过的当前.target.在此.target中，我正在寻找.scrolling img并获取宽度.然后继续前进...

The $(this) refers to the current .target which will be looped through. Within this .target I'm looking for the .scrolling img and get the width. And then keep on going...

具有不同宽度的图像

如果要计算所有图像的宽度(当它们具有不同的宽度时)，可以这样:

If you want to calculate the width of all images (when they have different widths) you can do it like this:

// Get the total width of a collection.
$.fn.getTotalWidth = function(){
    var width = 0;
    this.each(function(){
        width += $(this).width();
    });
    return width;
}

$(".target").each(function(){
    var images = $(this).find(".scrolling img");
    var width = images.getTotalWidth();
    $(this).find(".scrolling").width( width * 1.2 );
});

这篇关于jQuery遍历每个div的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！