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Viewing file:     utils.domManipulation.js (6.12 KB)      -rw-r--r--

(function () {
    var none = [0, "", ""],
        table = [1, "<table>", "</table>"],
        tbody = [2, "<table><tbody>", "</tbody></table>"],
        tr = [3, "<table><tbody><tr>", "</tr></tbody></table>"],
        select = [1, "<select multiple='multiple'>", "</select>"],
        lookup = {
            'thead': table,
            'tbody': table,
            'tfoot': table,
            'tr': tbody,
            'td': tr,
            'th': tr,
            'option': select,
            'optgroup': select
        },

        // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.
        mayRequireCreateElementHack = ko.utils.ieVersion <= 8;

    function getWrap(tags) {
        var m = tags.match(/^<([a-z]+)[ >]/);
        return (m && lookup[m[1]]) || none;
    }

    function simpleHtmlParse(html, documentContext) {
        documentContext || (documentContext = document);
        var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;

        // Based on jQuery's "clean" function, but only accounting for table-related elements.
        // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly

        // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
        // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
        // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
        // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.

        // Trim whitespace, otherwise indexOf won't work as expected
        var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div"),
            wrap = getWrap(tags),
            depth = wrap[0];

        // Go to html and back, then peel off extra wrappers
        // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
        var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
        if (typeof windowContext['innerShiv'] == "function") {
            // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding
            // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv
            // somehow shims the native APIs so it just works anyway)
            div.appendChild(windowContext['innerShiv'](markup));
        } else {
            if (mayRequireCreateElementHack) {
                // The document.createElement('my-element') trick to enable custom elements in IE6-8
                // only works if we assign innerHTML on an element associated with that document.
                documentContext.appendChild(div);
            }

            div.innerHTML = markup;

            if (mayRequireCreateElementHack) {
                div.parentNode.removeChild(div);
            }
        }

        // Move to the right depth
        while (depth--)
            div = div.lastChild;

        return ko.utils.makeArray(div.lastChild.childNodes);
    }

    function jQueryHtmlParse(html, documentContext) {
        // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
        if (jQueryInstance['parseHTML']) {
            return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
        } else {
            // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
            var elems = jQueryInstance['clean']([html], documentContext);

            // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
            // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
            // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
            if (elems && elems[0]) {
                // Find the top-most parent element that's a direct child of a document fragment
                var elem = elems[0];
                while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
                    elem = elem.parentNode;
                // ... then detach it
                if (elem.parentNode)
                    elem.parentNode.removeChild(elem);
            }

            return elems;
        }
    }

    ko.utils.parseHtmlFragment = function(html, documentContext) {
        return jQueryInstance ?
            jQueryHtmlParse(html, documentContext) :   // As below, benefit from jQuery's optimisations where possible
            simpleHtmlParse(html, documentContext);  // ... otherwise, this simple logic will do in most common cases.
    };

    ko.utils.setHtml = function(node, html) {
        ko.utils.emptyDomNode(node);

        // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
        html = ko.utils.unwrapObservable(html);

        if ((html !== null) && (html !== undefined)) {
            if (typeof html != 'string')
                html = html.toString();

            // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
            // for example <tr> elements which are not normally allowed to exist on their own.
            // If you've referenced jQuery we'll use that rather than duplicating its code.
            if (jQueryInstance) {
                jQueryInstance(node)['html'](html);
            } else {
                // ... otherwise, use KO's own parsing logic.
                var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
                for (var i = 0; i < parsedNodes.length; i++)
                    node.appendChild(parsedNodes[i]);
            }
        }
    };
})();

ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
ko.exportSymbol('utils.setHtml', ko.utils.setHtml);