问题描述
我使用以下代码将字符串解析为 DOM:
I am using the following code to parse a string into DOM:
var doc = new DOMParser().parseFromString(string, 'text/xml');
其中 string
类似于 <!DOCTYPE html><html><head></head><body>content</body></html>
.
typeof doc
给了我 object
.如果我执行类似 doc.querySelector('body')
的操作,我会返回一个 DOM 对象.但是,如果我尝试访问任何属性,就像通常一样,它会给我 undefined
:
typeof doc
gives me object
. If I do something like doc.querySelector('body')
I get a DOM object back. But if I try to access any properties, like you normally can, it gives me undefined
:
doc.querySelector('body').innerHTML; // undefined
其他属性也是如此,例如id
.另一方面,属性检索运行良好 doc.querySelector('body').getAttribute('id');
.
The same goes for other properties, e.g. id
. The attribute retrieval on the other hand goes fine doc.querySelector('body').getAttribute('id');
.
有什么神奇的功能可以访问这些属性吗?
Is there a magic function to have access to those properties?
推荐答案
您当前的方法失败,因为没有为给定的 XML 文档定义 HTML 属性.如果您提供 text/html
MIME 类型,该方法应该可以工作.
Your current method fails, because HTML properties are not defined for the given XML document. If you supply the text/html
MIME-type, the method should work.
var string = '<!DOCTYPE html><html><head></head><body>content</body></html>';
var doc = new DOMParser().parseFromString(string, 'text/html');
doc.body.innerHTML; // or doc.querySelector('body').innerHTML
// ^ Returns "content"
下面的代码为尚不原生支持的浏览器启用 text/html
MIME 类型.检索自 Mozilla 开发者网络:
The code below enables the text/html
MIME-type for browsers which do not natively support it yet. Is retrieved from the Mozilla Developer Network:
/*
* DOMParser HTML extension
* 2012-02-02
*
* By Eli Grey, http://eligrey.com
* Public domain.
* NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
*/
/*! @source https://gist.github.com/1129031 */
/*global document, DOMParser*/
(function(DOMParser) {
"use strict";
var DOMParser_proto = DOMParser.prototype
, real_parseFromString = DOMParser_proto.parseFromString;
// Firefox/Opera/IE throw errors on unsupported types
try {
// WebKit returns null on unsupported types
if ((new DOMParser).parseFromString("", "text/html")) {
// text/html parsing is natively supported
return;
}
} catch (ex) {}
DOMParser_proto.parseFromString = function(markup, type) {
if (/^s*text/htmls*(?:;|$)/i.test(type)) {
var doc = document.implementation.createHTMLDocument("")
, doc_elt = doc.documentElement
, first_elt;
doc_elt.innerHTML = markup;
first_elt = doc_elt.firstElementChild;
if (doc_elt.childElementCount === 1
&& first_elt.localName.toLowerCase() === "html") {
doc.replaceChild(first_elt, doc_elt);
}
return doc;
} else {
return real_parseFromString.apply(this, arguments);
}
};
}(DOMParser));
这篇关于JavaScript DOMParser 访问innerHTML 等属性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!