combox下拉列表多选（Ext.ux.form.LovCombo）
Ext.ux.form.LovCombo继承自Ext.form.ComboBox,实现了下拉列表的多选Ext.ux.form.LovCombo的js源码为：
// add RegExp.escape if it has not been already added if('function' !== typeof RegExp.escape) { RegExp.escape = function(s) { if('string' !== typeof s) { return s; } // Note: if pasting from forum, precede ]/\ with backslash manually return s.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1'); }; // eo function escape } // create namespace Ext.ns('Ext.ux.form'); /** * * @class Ext.ux.form.LovCombo * @extends Ext.form.ComboBox */Ext.ux.form.LovCombo = Ext.extend(Ext.form.ComboBox, { // {{{ // configuration options /** * @cfg {String} checkField name of field used to store checked state. * It is automatically added to existing fields. * Change it only if it collides with your normal field. */ checkField:'checked', /** * @cfg {String} separator separator to use between values and texts */ separator:',', /** * @cfg {String/Array} tpl Template for items. * Change it only if you know what you are doing. */ // }}} // {{{ initComponent:function() { // template with checkbox if(!this.tpl) { this.tpl = '<tpl for=".">' +'<div class="x-combo-list-item">' +'<img src="' + Ext.BLANK_IMAGE_URL + '" ' +'class="ux-lovcombo-icon ux-lovcombo-icon-' +'{}">' +'<div class="ux-lovcombo-item-text">{' + (this.displayField || 'text' )+ '}</div>' +'</div>' +'</tpl>'; } // call parent Ext.ux.form.LovCombo.superclass.initComponent.apply(this, arguments); // install internal event handlers this.on({ scope:this ,beforequery:this.onBeforeQuery ,blur:this.onRealBlur }); // remove selection from input field this.onLoad = this.onLoad.createSequence(function() { if(this.el) { var v = this.el.dom.value; this.el.dom.value = ''; this.el.dom.value = v; } }); }, // e/o function initComponent // }}} // {{{ /** * Disables default tab key bahavior * @private */ initEvents:function() { Ext.ux.form.LovCombo.superclass.initEvents.apply(this, arguments); // disable default tab handling - does no good this.keyNav.tab = false; }, // eo function initEvents // }}} // {{{ /** * clears value */ clearValue:function() { this.value = ''; this.setRawValue(this.value); this.store.clearFilter(); this.store.each(function(r) { r.set(this.checkField, false); }, this); if(this.hiddenField) { this.hiddenField.value = ''; } this.applyEmptyText(); }, // eo function clearValue // }}} // {{{ /** * @return {String} separator (plus space) separated list of selected displayFields * @private */ getCheckedDisplay:function() { var re = new RegExp(this.separator, "g"); return this.getCheckedValue(this.displayField).replace(re, this.separator + ' '); }, // eo function getCheckedDisplay // }}} // {{{ /** * @return {String} separator separated list of selected valueFields * @private */ getCheckedValue:function(field) { field = field || this.valueField; var c = []; // store may be filtered so get all records var snapshot = this.store.snapshot || this.store.data; snapshot.each(function(r) { if(r.get(this.checkField)) { c.push(r.get(field)); } }, this); return c.join(this.separator); }, // eo function getCheckedValue // }}} // {{{ /** * beforequery event handler - handles multiple selections * @param {Object} qe query event * @private */ onBeforeQuery:function(qe) { qe.query = qe.query.replace(new RegExp(this.getCheckedDisplay() + '[ ' + this.separator + ']*'), ''); }, // eo function onBeforeQuery // }}} // {{{ /** * blur event handler - runs only when real blur event is fired */ onRealBlur:function() { this.list.hide(); var rv = this.getRawValue(); var rva = rv.split(new RegExp(RegExp.escape(this.separator) + ' *')); var va = []; var snapshot = this.store.snapshot || this.store.data; // iterate through raw values and records and check/uncheck items Ext.each(rva, function(v) { snapshot.each(function(r) { if(v === r.get(this.displayField)) { va.push(r.get(this.valueField)); } }, this); }, this); this.setValue(va.join(this.separator)); this.store.clearFilter(); }, // eo function onRealBlur // }}} // {{{ /** * Combo's onSelect override * @private * @param {Ext.data.Record} record record that has been selected in the list * @param {Number} index index of selected (clicked) record */ onSelect:function(record, index) { if(this.fireEvent('beforeselect', this, record, index) !== false){ // toggle checked field record.set(this.checkField, !record.get(this.checkField)); //record.set(this.displayField, !record.get(this.checkField)); // display full list if(this.store.isFiltered()) { this.doQuery(this.allQuery); } // set (update) value and fire event this.setValue(this.getCheckedValue()); this.fireEvent('select', this, record, index); } }, // eo function onSelect // }}} // {{{ /** * Sets the value of the LovCombo * @param {Mixed} v value */ setValue:function(v) { if(v) { v = '' + v; if(this.valueField) { this.store.clearFilter();//个人注释掉的，感觉没什么用 /*this.store.each(function(r) {var re='(^|' + this.separator + ')' + RegExp.escape(r.get(this.valueField))+'(' + this.separator + '|$)'; var checked = !(!v.match(re)); r.set(this.checkField, checked); }, this);*/ this.value = this.getCheckedValue(); this.setRawValue(this.getCheckedDisplay()); if(this.hiddenField) { this.hiddenField.value = this.value; } } else { this.value = v; this.setRawValue(v); if(this.hiddenField) { this.hiddenField.value = v; } } if(this.el) { this.el.removeClass(this.emptyClass); } } else { this.clearValue(); } }, // eo function setValue // }}} // {{{ /** * Selects all items */ selectAll:function() { this.store.each(function(record){ // toggle checked field record.set(this.checkField, true); }, this); //display full list this.doQuery(this.allQuery); this.setValue(this.getCheckedValue()); }, // eo full selectAll // }}} // {{{ /** * Deselects all items. Synonym for clearValue */ deselectAll:function() { this.clearValue(); } // eo full deselectAll // }}} }); // eo extend // register xtype Ext.reg('lovcombo', Ext.ux.form.LovCombo); // eof
CSS样式：
.ux-lovcombo-icon { width:16px; height:16px; float:left; background-position: -1px -1px ! important; background-repeat:no-repeat ! important; } .ux-lovcombo-icon-checked { background: transparent url(../../resources/images/default/menu/checked.gif); } .ux-lovcombo-icon-unchecked { background: transparent url(../../resources/images/default/menu/unchecked.gif); }
示例：
Ext.onReady(function(){ var lc = new Ext.ux.form.LovCombo({ id:'lovcombo', renderTo:'lovcomboct', width:300, hideOnSelect:false, maxHeight:200, readOnly:true, editable:false, store:new Ext.data.SimpleStore({ id:0, fields:[{name:'id',type:'int'}, 'privGroup'], data:[ , , , , ] }), triggerAction:'all', valueField:'id',//checkField:"id" displayField:'privGroup', mode:'local' }); }); 效果：
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