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TiddlyWiki5/core/modules/widgets/element.js
Jermolene ba6edd42c1 Explicitly blacklist unsafe elements, starting with <script>
Are there are any other elements that might be considered unsafe?
2014-03-19 10:05:44 +00:00

81 lines
2.1 KiB
JavaScript
Executable File

/*\
title: $:/core/modules/widgets/element.js
type: application/javascript
module-type: widget
Element widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var ElementWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
ElementWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
ElementWidget.prototype.render = function(parent,nextSibling) {
this.parentDomNode = parent;
this.computeAttributes();
this.execute();
// Neuter blacklisted elements
var tag = this.parseTreeNode.tag;
if($tw.config.htmlUnsafeElements.indexOf(tag) !== -1) {
tag = "safe-" + tag;
}
var domNode = this.document.createElementNS(this.namespace,tag);
this.assignAttributes(domNode,{excludeEventAttributes: true});
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
/*
Compute the internal state of the widget
*/
ElementWidget.prototype.execute = function() {
// Select the namespace for the tag
var tagNamespaces = {
svg: "http://www.w3.org/2000/svg",
math: "http://www.w3.org/1998/Math/MathML",
body: "http://www.w3.org/1999/xhtml"
};
this.namespace = tagNamespaces[this.parseTreeNode.tag];
if(this.namespace) {
this.setVariable("namespace",this.namespace);
} else {
this.namespace = this.getVariable("namespace",{defaultValue: "http://www.w3.org/1999/xhtml"});
}
// Make the child widgets
this.makeChildWidgets();
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
ElementWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes(),
hasChangedAttributes = $tw.utils.count(changedAttributes) > 0;
if(hasChangedAttributes) {
// Update our attributes
this.assignAttributes(this.domNodes[0],{excludeEventAttributes: true});
}
return this.refreshChildren(changedTiddlers) || hasChangedAttributes;
};
exports.element = ElementWidget;
})();