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/**
* Copyright 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
'use strict';
var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
var DOMNamespaces = require('./DOMNamespaces');
var WHITESPACE_TEST = /^[ \r\n\t\f]/;
var NONVISIBLE_TEST = /<(!--|link|noscript|meta|script|style)[ \r\n\t\f\/>]/;
var createMicrosoftUnsafeLocalFunction = require('./createMicrosoftUnsafeLocalFunction');
// SVG temp container for IE lacking innerHTML
var reusableSVGContainer;
/**
* Set the innerHTML property of a node, ensuring that whitespace is preserved
* even in IE8.
*
* @param {DOMElement} node
* @param {string} html
* @internal
*/
var setInnerHTML = createMicrosoftUnsafeLocalFunction(function (node, html) {
// IE does not have innerHTML for SVG nodes, so instead we inject the
// new markup in a temp node and then move the child nodes across into
// the target node
if (node.namespaceURI === DOMNamespaces.svg && !('innerHTML' in node)) {
reusableSVGContainer = reusableSVGContainer || document.createElement('div');
reusableSVGContainer.innerHTML = '<svg>' + html + '</svg>';
var svgNode = reusableSVGContainer.firstChild;
while (svgNode.firstChild) {
node.appendChild(svgNode.firstChild);
}
} else {
node.innerHTML = html;
}
});
if (ExecutionEnvironment.canUseDOM) {
// IE8: When updating a just created node with innerHTML only leading
// whitespace is removed. When updating an existing node with innerHTML
// whitespace in root TextNodes is also collapsed.
// @see quirksmode.org/bugreports/archives/2004/11/innerhtml_and_t.html
// Feature detection; only IE8 is known to behave improperly like this.
var testElement = document.createElement('div');
testElement.innerHTML = ' ';
if (testElement.innerHTML === '') {
setInnerHTML = function (node, html) {
// Magic theory: IE8 supposedly differentiates between added and updated
// nodes when processing innerHTML, innerHTML on updated nodes suffers
// from worse whitespace behavior. Re-adding a node like this triggers
// the initial and more favorable whitespace behavior.
// TODO: What to do on a detached node?
if (node.parentNode) {
node.parentNode.replaceChild(node, node);
}
// We also implement a workaround for non-visible tags disappearing into
// thin air on IE8, this only happens if there is no visible text
// in-front of the non-visible tags. Piggyback on the whitespace fix
// and simply check if any non-visible tags appear in the source.
if (WHITESPACE_TEST.test(html) || html[0] === '<' && NONVISIBLE_TEST.test(html)) {
// Recover leading whitespace by temporarily prepending any character.
// \uFEFF has the potential advantage of being zero-width/invisible.
// UglifyJS drops U+FEFF chars when parsing, so use String.fromCharCode
// in hopes that this is preserved even if "\uFEFF" is transformed to
// the actual Unicode character (by Babel, for example).
// https://github.com/mishoo/UglifyJS2/blob/v2.4.20/lib/parse.js#L216
node.innerHTML = String.fromCharCode(0xfeff) + html;
// deleteData leaves an empty `TextNode` which offsets the index of all
// children. Definitely want to avoid this.
var textNode = node.firstChild;
if (textNode.data.length === 1) {
node.removeChild(textNode);
} else {
textNode.deleteData(0, 1);
}
} else {
node.innerHTML = html;
}
};
}
testElement = null;
}
module.exports = setInnerHTML;
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