mirror of
https://github.com/Jermolene/TiddlyWiki5
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140 lines
3.6 KiB
JavaScript
140 lines
3.6 KiB
JavaScript
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/*\
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title: $:/core/modules/widgets/select.js
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type: application/javascript
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module-type: widget
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Select widget:
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```
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<$select tiddler="MyTiddler" field="text">
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<$list filter="[tag[chapter]]">
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<option value=<<currentTiddler>>>
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<$view field="description"/>
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</option>
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</$list>
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</$select>
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```
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/widgets/widget.js").widget;
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var SelectWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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SelectWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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SelectWidget.prototype.render = function(parent,nextSibling) {
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this.parentDomNode = parent;
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this.computeAttributes();
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this.execute();
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this.renderChildren(parent,nextSibling);
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this.setSelectValue();
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$tw.utils.addEventListeners(this.getSelectDomNode(),[
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{name: "change", handlerObject: this, handlerMethod: "handleChangeEvent"}
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]);
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};
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/*
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Handle a change event
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*/
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SelectWidget.prototype.handleChangeEvent = function(event) {
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var value = this.getSelectDomNode().value;
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this.wiki.setText(this.selectTitle,this.selectField,this.selectIndex,value);
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};
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/*
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If necessary, set the value of the select element to the current value
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*/
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SelectWidget.prototype.setSelectValue = function() {
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var value = this.selectDefault;
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// Get the value
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if(this.selectIndex) {
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value = this.wiki.extractTiddlerDataItem(this.selectTitle,this.selectIndex);
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} else {
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var tiddler = this.wiki.getTiddler(this.selectTitle);
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if(tiddler) {
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if(this.selectField === "text") {
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// Calling getTiddlerText() triggers lazy loading of skinny tiddlers
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value = this.wiki.getTiddlerText(this.selectTitle);
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} else {
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if($tw.utils.hop(tiddler.fields,this.selectField)) {
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value = tiddler.getFieldString(this.selectField);
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}
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}
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} else {
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if(this.selectField === "title") {
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value = this.selectTitle;
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}
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}
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}
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// Assign it to the select element if it's different than the current value
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var domNode = this.getSelectDomNode();
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if(domNode.value !== value) {
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domNode.value = value;
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}
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};
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/*
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Get the DOM node of the select element
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*/
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SelectWidget.prototype.getSelectDomNode = function() {
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return this.children[0].domNodes[0];
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};
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/*
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Compute the internal state of the widget
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*/
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SelectWidget.prototype.execute = function() {
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// Get our parameters
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this.selectTitle = this.getAttribute("tiddler",this.getVariable("currentTiddler"));
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this.selectField = this.getAttribute("field","text");
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this.selectIndex = this.getAttribute("index");
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this.selectClass = this.getAttribute("class");
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this.selectDefault = this.getAttribute("default");
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// Make the child widgets
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var selectNode = {
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type: "element",
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tag: "select",
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children: this.parseTreeNode.children
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};
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if(this.selectClass) {
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$tw.utils.addAttributeToParseTreeNode(selectNode,"class",this.selectClass);
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}
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this.makeChildWidgets([selectNode]);
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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SelectWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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// If we're using a different tiddler/field/index then completely refresh ourselves
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if(changedAttributes.selectTitle || changedAttributes.selectField || changedAttributes.selectIndex) {
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this.refreshSelf();
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return true;
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// If the target tiddler value has changed, just update setting and refresh the children
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} else {
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if(changedTiddlers[this.selectTitle]) {
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this.setSelectValue();
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}
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return this.refreshChildren(changedTiddlers);
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}
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};
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exports.select = SelectWidget;
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})();
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