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-'
+'{[values.' + this.checkField + '?"checked":"unchecked"' + ']}">'
+'<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:[
[1, 'Personnel']
,[11, 'Finance']
,[2, 'Management']
,[22, 'Production']
,[3, 'Users']
]
}),
triggerAction:'all',
valueField:'id',
//checkField:"id"
displayField:'privGroup',
mode:'local'
});
});
效果：