如何从 jQuery 选择器获取 DOM 元素? [英] How to get a DOM Element from a jQuery selector?

问题描述

我很难找到从 jQuery 选择器中获取实际 DOMElement 的方法.

I'm having an impossibly hard time finding out to get the actual DOMElement from a jQuery selector.

示例代码:

<input type="checkbox" id="bob" />
var checkbox = $("#bob").click(function() { //some code  } )

在另一段代码中，我试图确定复选框的选中值.

and in another piece of code I'm trying to determine the checked value of the checkbox.

  if ( checkbox.eq(0).SomeMethodToGetARealDomElement().checked )
    //do something.

拜托，我不想这样做:

  if ( checkbox.eq(0).is(":checked"))
    //do something

这让我绕过了复选框，但其他时候我需要真正的 DOMElement.

That gets me around the checkbox, but other times I've needed the real DOMElement.

推荐答案

您可以通过以下方式访问原始 DOM 元素:

You can access the raw DOM element with:

$("table").get(0);

或者更简单:

$("table")[0];

然而(根据我的经验)实际上并没有很多你需要它.以复选框为例:

There isn't actually a lot you need this for however (in my experience). Take your checkbox example:

$(":checkbox").click(function() {
  if ($(this).is(":checked")) {
    // do stuff
  }
});

更jquery'ish"并且(恕我直言)更简洁.如果你想给它们编号怎么办?

is more "jquery'ish" and (imho) more concise. What if you wanted to number them?

$(":checkbox").each(function(i, elem) {
  $(elem).data("index", i);
});
$(":checkbox").click(function() {
  if ($(this).is(":checked") && $(this).data("index") == 0) {
    // do stuff
  }
});

其中一些功能也有助于掩盖浏览器中的差异.某些属性可能不同.典型的例子是 AJAX 调用.要在原始 Javascript 中正确执行此操作，XmlHttpRequest 大约有 7 种回退情况.

Some of these features also help mask differences in browsers too. Some attributes can be different. The classic example is AJAX calls. To do this properly in raw Javascript has about 7 fallback cases for XmlHttpRequest.

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