1. #1
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    Default Nullable ComboBox

    Nullable ComboBox


    Extends Ext.form.ComboBox
    Adds new attribute called 'nullable'
    And two events 'clear' (fires when value cleared) and 'change' (fires when value changed)
    if nullable is set to true and some value selected - shows button to clear value
    Event 'change' like event 'select' but no have arguments and fires even when value is cleared


    Code:
    Ext.override(Ext.form.ComboBox, {
        nullable:false
        ,initComponent: Ext.form.ComboBox.prototype.initComponent.createSequence(function(){
            this.triggerConfig = {
                tag:'span', cls:'x-form-twin-triggers', cn:[
                    {tag: "img", src: Ext.BLANK_IMAGE_URL, cls:'x-form-trigger '},
                    {tag: "img", src: Ext.BLANK_IMAGE_URL, cls:'x-form-trigger x-form-clear-trigger'}
            ]};
            this.addEvents(
                'clear',
                'change'
            );
            this.on('select', function(){
                this.nullable && this.trigger_clear.show();
                this.fireEvent('change', this);
            });
        })
        ,clearValue:Ext.form.ComboBox.prototype.clearValue.createSequence(function(){
            if(this.trigger_clear){
                this.trigger_clear.hide();
            }
            this.fireEvent('clear',  this);
            this.fireEvent('change', this);
        })
        ,onRender:Ext.form.ComboBox.prototype.onRender.createSequence(function(ct, position){
            var self = this;
            var triggers = this.trigger.select('.x-form-trigger', true).elements;
            for(var i;i<triggers.length;i++){
                triggers[i].addClassOnOver('x-form-trigger-over');
                triggers[i].addClassOnOver('x-form-trigger-over');
            }
            this.trigger_clear = triggers[1];
            this.trigger_clear.hide = function(){
                var w = self.wrap.getWidth();
                this.dom.style.display = 'none';
                self.el.setWidth(w-self.trigger.getWidth());
            };
            this.trigger_clear.show = function(){
                var w = self.wrap.getWidth();
                this.dom.style.display = '';
                self.el.setWidth(w-self.trigger.getWidth());
            };
            this.mon(this.trigger_clear, 'click', this.clearValue, this, {stopPropagation:true});
            if(!this.getValue())
                this.trigger_clear.hide();
        })
        ,onDestroy : Ext.form.ComboBox.prototype.onDestroy.createInterceptor(function() {
            Ext.destroy(this.triggers);
            return [];
        })
    });
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  2. #2
    Sencha - Ext JS Dev Team Animal's Avatar
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    Default


    The TwinTriggerCombo will allow this very simply.

    http://www.google.com/cse?cx=0017339...ombo&sa=Search

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