Databinding for ExtJs Combobox from Database(Sql)

How to bind d开发者_StackOverflow社区ata to ExtJS combo from sql database (how to assign datatable for extjs combobox as a store)

basic example should be like this:

var combo = new Ext.form.ComboBox({
  typeAhead: true,
  triggerAction: 'all',
  store: new Ext.data.JsonStore({
    reader: new Ext.data.JasonReader ( {
       fields: [ 'myId', 'displayText' ],
       root: 'rows'
     }),
     proxy: new Ext.data.HttpProxy ( {
       url: 'path/to/your/script.aspx'
     } )
  valueField: 'myId',
  displayField: 'displayText'
});

where /path/to/your/script.aspx returns data like this:

{"success":true,"total":4,"rows":[
  {"myId":"1","displayText":"Option 1"},
  {"myId":"2","displayText":"Option 2"},
  {"myId":"3","displayText":"Option 3"},
  {"myId":"4","displayText":"Option 4"}
]}