uas-platform/frontend/uas-web/app/field/SearchField.js

Ext.define('uas.field.SearchField', {
    extend: 'Ext.form.field.Text',
    xtype: 'searchfield',

    requires: [
        'uas.form.trigger.Search'
    ],

    enableLabelClick: true,
    editable: false,

    config: {
        triggers: {
            search: {
                type: 'search',
                handler: 'onSearch',
                scope: 'this'
            }
        }
    },

    onSearch: function(field, trigger, e) {
        this.fireEvent('search', this, e);
    }
});