JavaScript DOMParser访问innerHTML等属性 [英] JavaScript DOMParser access innerHTML and other properties
问题描述
我正在使用以下代码来将字符串解析为DOM:
var doc new DOMParser()。parseFromString(string ,'text / xml');
其中 string
就像<!DOCTYPE html>< html>< head>< / head>< body> content< / body>< / html>
b
$ b
typeof doc
给我对象
。如果我做了像 doc.querySelector('body')
之类的东西,我会收到一个DOM对象。但是,如果我尝试访问任何属性,像你通常可以,它给我 undefined
:
doc.querySelector( '主体')的innerHTML。 // undefined
其他属性也是如此。 ID
。另一方面,属性检索变得很好 doc.querySelector('body')。getAttribute('id');
。
是否有一个魔术功能来访问这些属性?
您当前的方法失败,因为HTML属性没有为给定的XML文档定义。如果您提供 text / html
MIME类型,该方法应该可以工作。
var string ='<!DOCTYPE html>< html>< head>< / head>< body> content< / body>< / html>';
var doc = new DOMParser()。parseFromString(string,'text / html');
doc.body.innerHTML; //或doc.querySelector('body')。innerHTML
// ^返回内容
下面的代码为不支持本身的浏览器使用 text / html
MIME类型。从 Mozilla开发人员网络检索:
/ *
* DOMParser HTML扩展
* 2012-02-02
*
*由Eli Gray,http://eligrey.com
*公共领域。
*无明示或暗示的保证。使用您自己的风险。
* /
/ *! @source https://gist.github.com/1129031 * /
/ *全局文件,DOMParser * /
(function(DOMParser){
use strict;
var DOMParser_proto = DOMParser.prototype
,real_parseFromString = DOMParser_proto.parseFromString;
// Firefox / Opera / IE在不支持的类型上抛出错误
try {
// WebKit在不支持的类型上返回null
if((new DOMParser).parseFromString(,text / html)){
// text / html解析本身支持
返回;
}
} catch(ex){}
DOMParser_proto.parseFromString = function(标记,类型){
if(/ ^ \s * text \ / html\s *(?:; | $)/ 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));
I am using the following code to parse a string into DOM:
var doc new DOMParser().parseFromString(string, 'text/xml');
Where string
is just something like <!DOCTYPE html><html><head></head><body>content</body></html>
.
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
The same goes for other properties, e.g. id
. The attribute retrieval on the other hand goes fine doc.querySelector('body').getAttribute('id');
.
Is there a magic function to have access to those properties?
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"
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\/html\s*(?:;|$)/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));
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