取得标记名为< div>的孩子仅在javascript中 [英] Get children with tagname as <div> only in javascript

问题描述

我有一个HTML:

<div id="xyz">

 <svg>......</svg>
 <img>....</img>
 <div id = "a"> hello </div>
 <div id = "b"> hello
      <div id="b1">I m a grand child</div>     
 </div>
 <div id = "c"> hello </div>

</div>

我想在javascript变量中获得所有带有id为xyz的父元素的标签为div的孩子.

I want to get all the children with tags as "div" of the parent element with id = xyz in a javascript variable.

这样我的输出应该是:

"<div id = "a"> hello </div>
 <div id = "b"> hello
      <div id="b1">I m a grand child</div>     
 </div>
 <div id = "c"> hello </div>"

推荐答案

您可以使用querySelectorAll:

var childDivs = document.querySelectorAll('#xyz div')

将div转换为字符串(用于存储或警报)的方法可能是:

A method to transform the divs to a string (to store or to alert) could be:

var divsHtml = function () {
    var divhtml = [],
        i = -1,
        divs = document.querySelectorAll('#xyz div');
    while (i++ < divs.length) {
        divs[i] && divhtml.push(divs[i].outerHTML);
    }
    return divhtml.join('');
}();

如果您需要与旧版浏览器(ic IE< 8)兼容，请使用@ Cerbrus '方法来检索div，或使用垫片.

If you need compatibility for older browsers (i.c. IE<8) use @Cerbrus' method to retrieve the divs, or use a shim.

为避免重复列出(嵌套的)div，您可能要使用

To avoid double listing of (nested) divs, you may want to use

var divsHtml = function () {
    var divhtml = [],
        i = -1,
        divs = document.querySelector('#xyz').childNodes;
    while (i++ < divs.length) {
        divs[i] &&
        /div/i.test(divs[i].tagName) &&
        divhtml.push(divs[i].outerHTML);
        /* ^ this can also be written as:
          if(divs[i] && /div/i.test(divs[i].tagName) {
              divhtml.push(divs[i].outerHTML)
          }
        */
    }
    return divhtml.join('');
}();

这是 jsfiddle

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