Function morphdom

plugins/Sidebar/media/all.js:1375–1616

(fromNode, toNode, options)

}

function morphdom(fromNode, toNode, options) {
    if (!options) {
        options = {};
    }

    if (typeof toNode === 'string') {
        var newBodyEl = document.createElement('body');
        newBodyEl.innerHTML = toNode;
        toNode = newBodyEl.childNodes[0];
    }

    var savedEls = {}; // Used to save off DOM elements with IDs
    var unmatchedEls = {};
    var onNodeDiscarded = options.onNodeDiscarded || noop;
    var onBeforeMorphEl = options.onBeforeMorphEl || noop;
    var onBeforeMorphElChildren = options.onBeforeMorphElChildren || noop;

    function removeNodeHelper(node, nestedInSavedEl) {
        var id = node.id;
        // If the node has an ID then save it off since we will want
        // to reuse it in case the target DOM tree has a DOM element
        // with the same ID
        if (id) {
            savedEls[id] = node;
        } else if (!nestedInSavedEl) {
            // If we are not nested in a saved element then we know that this node has been
            // completely discarded and will not exist in the final DOM.
            onNodeDiscarded(node);
        }

        if (node.nodeType === 1) {
            var curChild = node.firstChild;
            while(curChild) {
                removeNodeHelper(curChild, nestedInSavedEl || id);
                curChild = curChild.nextSibling;
            }
        }
    }

    function walkDiscardedChildNodes(node) {
        if (node.nodeType === 1) {
            var curChild = node.firstChild;
            while(curChild) {


                if (!curChild.id) {
                    // We only want to handle nodes that don't have an ID to avoid double
                    // walking the same saved element.

                    onNodeDiscarded(curChild);

                    // Walk recursively
                    walkDiscardedChildNodes(curChild);
                }

                curChild = curChild.nextSibling;
            }
        }