smartschool-platform/frontend/pc-web/overrides/form/field/ComboBox.js

Ext.define("school.override.form.field.ComboBox", {
    override: "Ext.form.field.ComboBox",
    
    clearable: false,

    config: {
        triggers: {
            clear: {
                weight: -1,
                cls: 'fa-times',
                hidden: true,
                onFieldFocus: function() {
                    if(this.field.clearable) {
                        this.setHidden(false);
                    }
                },
                onFieldBlur: function() {
                    if(this.field.clearable) {
                        this.setHidden(true);
                    }
                },
                handler: function() {
                    if(this.clearable) {
                        this.setValue(null)
                        this.triggers.clear.setHidden(true)
                        this.fireEvent('clear', this);
                    }
                }
            },
            picker: {
                handler: 'onTriggerClick',
                scope: 'this',
                focusOnMousedown: true
            }
        }
    },

});