Ext多选下拉框

Ext多选下拉框

2009-02-11 13:19

 

 

一.首先引入对象Ext.form.MultiSelect

// vim: ts=4:sw=4:nu:fdc=4:nospell

 

// 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.form');

Ext.form.MultiSelect = Ext.extend(Ext.form.ComboBox, {

// {{{
// configuration options

checkField:'checked'

,separator:','

// }}}
// {{{
,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-MultiSelect-icon ux-MultiSelect-icon-'
+'{[values.' + this.checkField + '?"checked":"unchecked"' + ']}">'
+'{[values.'+this.displayField+']}'
+'</div>'
+'</tpl>'
;
}

// call parent
Ext.form.MultiSelect.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
// }}}
// {{{

,initEvents:function() {
Ext.form.MultiSelect.superclass.initEvents.apply(this, arguments);

// disable default tab handling - does no good
this.keyNav.tab = false;

} // eo function initEvents
// }}}
// {{{

,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
// }}}
// {{{

,getCheckedDisplay:function() {
var re = new RegExp(this.separator, "g");
return this.getCheckedValue(this.displayField).replace(re, this.separator + ' ');
} // eo function getCheckedDisplay
// }}}
// {{{

,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
// }}}
// {{{

,onBeforeQuery:function(qe) {
qe.query = qe.query.replace(new RegExp(RegExp.escape(this.getCheckedDisplay()) + '[ ' + this.separator + ']*'), '');
} // eo function onBeforeQuery
// }}}
// {{{

,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
// }}}
// {{{

,onSelect:function(record, index) {
if(this.fireEvent('beforeselect', this, record, index) !== false){

// toggle checked field
record.set(this.checkField, !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
// }}}
// {{{

,setValue:function(v) {
if(v) {
v = '' + v;
if(this.valueField) {
this.store.clearFilter();
this.store.each(function(r) {
var checked = !(!v.match(
'(^|' + this.separator + ')' + RegExp.escape(r.get(this.valueField))
+'(' + this.separator + '|$)'))
;

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
// }}}
// {{{

,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
// }}}
// {{{

,deselectAll:function() {
this.clearValue();
} // eo full deselectAll
// }}}

}); // eo extend

// register xtype
Ext.reg('multiSelect', Ext.form.MultiSelect);

二.多选下拉框实现

//任务状态JsonStore
var taskstatusStore = new Ext.data.JsonStore({
id:'optvalue',
remoteSort: false,
fields: [
'optvalue',
'opttext'
],
proxy: new Ext.data.HttpProxy({
url: 'operation/task/querytaskstatuslist.jsp'
})
});
//给下拉框设置默认值
taskstatusStore.load();
taskstatusStore.on('load',function(){
taskstatuscombo.setValue(3);
});
var taskstatuscombo = new Ext.form.MultiSelect({
width:130,
editable: false,
store:taskstatusStore ,
valueField :"optvalue",
displayField: "opttext",
mode: 'local',
//forceSelection: true,一定不要声明此句
triggerAction: 'all',
allowBlank:false,
emptyText:'请选择'
});