Add checkbox widget and fix up task management example

core/modules/new_widgets/checkbox.js

@@ -0,0 +1,113 @@
+/*\
+title: $:/core/modules/new_widgets/checkbox.js
+type: application/javascript
+module-type: new_widget
+
+Checkbox widget
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
+
+var CheckboxWidget = function(parseTreeNode,options) {
+	this.initialise(parseTreeNode,options);
+};
+
+/*
+Inherit from the base widget class
+*/
+CheckboxWidget.prototype = new Widget();
+
+/*
+Render this widget into the DOM
+*/
+CheckboxWidget.prototype.render = function(parent,nextSibling) {
+	// Save the parent dom node
+	this.parentDomNode = parent;
+	// Compute our attributes
+	this.computeAttributes();
+	// Execute our logic
+	this.execute();
+	// Create our elements
+	this.labelDomNode = this.document.createElement("label");
+	this.inputDomNode = this.document.createElement("input");
+	this.inputDomNode.setAttribute("type","checkbox");
+	if(this.getValue()) {
+		this.inputDomNode.setAttribute("checked","true");
+	}
+	this.labelDomNode.appendChild(this.inputDomNode);
+	this.spanDomNode = this.document.createElement("span");
+	this.labelDomNode.appendChild(this.spanDomNode);
+	// Add a click event handler
+	$tw.utils.addEventListeners(this.inputDomNode,[
+		{name: "change", handlerObject: this, handlerMethod: "handleChangeEvent"}
+	]);
+	// Insert the label into the DOM and render any children
+	parent.insertBefore(this.labelDomNode,nextSibling);
+	this.renderChildren(this.spanDomNode,null);
+	this.domNodes.push(this.labelDomNode);
+};
+
+CheckboxWidget.prototype.getValue = function() {
+	var tiddler = this.wiki.getTiddler(this.checkboxTitle);
+	return tiddler ? tiddler.hasTag(this.checkboxTag) : false;
+};
+
+CheckboxWidget.prototype.handleChangeEvent = function(event) {
+	var checked = this.inputDomNode.checked,
+		tiddler = this.wiki.getTiddler(this.checkboxTitle);
+	if(tiddler && tiddler.hasTag(this.checkboxTag) !== checked) {
+		var newTags = tiddler.fields.tags.slice(0),
+			pos = newTags.indexOf(this.checkboxTag);
+		if(pos !== -1) {
+			newTags.splice(pos,1);
+		}
+		if(checked) {
+			newTags.push(this.checkboxTag);
+		}
+		this.wiki.addTiddler(new $tw.Tiddler(tiddler,{tags: newTags}));
+	}
+};
+
+/*
+Compute the internal state of the widget
+*/
+CheckboxWidget.prototype.execute = function() {
+	// Get the parameters from the attributes
+	this.checkboxTitle = this.getAttribute("title",this.getVariable("tiddlerTitle"));
+	this.checkboxTag = this.getAttribute("tag");
+	this.checkboxClass = this.getAttribute("class");
+	// 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
+*/
+CheckboxWidget.prototype.refresh = function(changedTiddlers) {
+	var changedAttributes = this.computeAttributes();
+	if(changedAttributes.title || changedAttributes.tag || changedAttributes["class"] || changedTiddlers[this.checkboxTitle]) {
+		this.refreshSelf();
+		return true;
+	}
+	return this.refreshChildren(changedTiddlers);
+};
+
+/*
+Remove any DOM nodes created by this widget or its children
+*/
+CheckboxWidget.prototype.removeChildDomNodes = function() {
+	$tw.utils.each(this.domNodes,function(domNode) {
+		domNode.parentNode.removeChild(domNode);
+	});
+	this.domNodes = [];
+};
+
+exports.checkbox = CheckboxWidget;
+
+})();

editions/tw5.com/tiddlers/samples/Tasks/TaskManagementExample.tid

@@ -10,7 +10,7 @@ TiddlyWiki5 can be used as a simple task management system without further custo
 
 <$list filter="[!has[draft.of]tag[task]!tag[done]sort[created]]">
 
-<$checkbox tag="done"> <$view field="title" format="link"/></$checkbox>
+<$checkbox tag="done"> <$link to={{!!title}}><$view field="title"/></$link></$checkbox>
 
 </$list>
 
@@ -18,6 +18,6 @@ TiddlyWiki5 can be used as a simple task management system without further custo
 
 <$list filter="[!has[draft.of]tag[task]tag[done]sort[created]]">
 
-<$checkbox tag="done"> ~~<$view field="title" format="link"/>~~</$checkbox>
+<$checkbox tag="done"> ~~<$link to={{!!title}}><$view field="title"/></$link>~~</$checkbox>
 
 </$list>