javascript - 文字列をDOM要素に変換する方法

Question

これは以前に質問されて回答されたか、誰かが適切に回答する前に質問が閉じられた可能性があります。誰かがそれをグーグルで検索した場合に備えて、ここに答えがあります：

https://developer.mozilla.org/en-US/docs/DOM/DOMParser

var parser = new DOMParser();
var doc = parser.parseFromString(stringContainingXMLSource, "application/xml");
// returns a Document, but not a SVGDocument nor a HTMLDocument

parser = new DOMParser();
doc = parser.parseFromString(stringContainingXMLSource, "image/svg+xml");
// returns a SVGDocument, which also is a Document.

parser = new DOMParser();
doc = parser.parseFromString(stringContainingHTMLSource, "text/html");
// returns a HTMLDocument, which also is a Document.



/*
 * DOMParser HTML extension
 * 2012-09-04
 *
 * 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.body.innerHTML = markup;
            return doc;
        } else {
            return real_parseFromString.apply(this, arguments);
        }
    };
}(DOMParser));

Answer 1

https://developer.mozilla.org/en-US/docs/DOM/DOMParser

var parser = new DOMParser();
var doc = parser.parseFromString(stringContainingXMLSource, "application/xml");
// returns a Document, but not a SVGDocument nor a HTMLDocument

parser = new DOMParser();
doc = parser.parseFromString(stringContainingXMLSource, "image/svg+xml");
// returns a SVGDocument, which also is a Document.

parser = new DOMParser();
doc = parser.parseFromString(stringContainingHTMLSource, "text/html");
// returns a HTMLDocument, which also is a Document.

一部のブラウザはtext/htmlをサポートしていないため、text/htmlのサポートを追加するためのMDNサイトからの追加コードを次に示します。

/*
 * DOMParser HTML extension
 * 2012-09-04
 *
 * 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.body.innerHTML = markup;
            return doc;
        } else {
            return real_parseFromString.apply(this, arguments);
        }
    };
}(DOMParser));

IE8以下

IE8以下の一部のブラウザにはDOMParserがないため、次の方法で文字列をHTMLに解析できます。

var div=document.createElement("div");
div.innerHTML=HTMLString;
var anchors=div.getElementsByTagName("a");