ext combox drop-down box does not appear automatically prompt, automatic selection solution_extjs

Look at the code

Copy the code The code is as follows:

var comboxContractType = new Ext.form.ComboBox( {
name:'logisticsId',
fieldLabel:'logistics company',
displayField:'logisticsName',
valueField:'logisticsId',
emptyText:'Please select',
width:330,
editable:true,
allowBlank:false,
mode:'local',
loadingText:'loading...',
hiddenName:'logisticsId',
//pageSize:10,
selectOnFocus: true,
triggerAction:'all',
store:comboxContractTypeStore = new Ext.data.JsonStore({
url:'/pcms/dictionary/ logistics.do?method=findLogistics',
root:'Datas',
totalProperty: 'TotalRecords',
fields:[
{name:'logisticsId', mapping:'logisticsid'},
{name:'logisticsName', mapping:'shortname'}
]
})
});
comboxContractTypeStore.load({params:{start:0,limit:100} });

Note 3 points:

Don’t set the PageSize attribute
Set the mode attribute to local local mode
Finally, you need to manually change the strobe used Perform load operation. stoe.load();