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  1. #1
    Ext JS Premium Member Stanback's Avatar
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    Default Ref Property Gone?

    Ref Property Gone?


    I am trying to use the 'ref' property on components for injecting back references like I could with Ext3. This was used on a lot of my previous code to get instances to various form fields that needed special handling. The nice thing was the ../ notation that allowed references to be placed where it was convenient.

    Here is the method in Ext3's Ext.Component that handled it:
    PHP Code:
        initRef : function(){
            
    /**
             * @cfg {String} ref
             * <p>A path specification, relative to the Component's <code>{@link #ownerCt}</code>
             * specifying into which ancestor Container to place a named reference to this Component.</p>
             * <p>The ancestor axis can be traversed by using '/' characters in the path.
             * For example, to put a reference to a Toolbar Button into <i>the Panel which owns the Toolbar</i>:</p><pre><code>
    var myGrid = new Ext.grid.EditorGridPanel({
        title: 'My EditorGridPanel',
        store: myStore,
        colModel: myColModel,
        tbar: [{
            text: 'Save',
            handler: saveChanges,
            disabled: true,
            ref: '../saveButton'
        }],
        listeners: {
            afteredit: function() {
    //          The button reference is in the GridPanel
                myGrid.saveButton.enable();
            }
        }
    });
    </code></pre>
             * <p>In the code above, if the <code>ref</code> had been <code>'saveButton'</code>
             * the reference would have been placed into the Toolbar. Each '/' in the <code>ref</code>
             * moves up one level from the Component's <code>{@link #ownerCt}</code>.</p>
             * <p>Also see the <code>{@link #added}</code> and <code>{@link #removed}</code> events.</p>
             */
            
    if(this.ref && !this.refOwner){
                var 
    levels this.ref.split('/'),
                    
    last levels.length,
                    
    0,
                    
    this;

                while(
    && last){
                    
    t.ownerCt;
                    ++
    i;
                }
                if(
    t){
                    
    t[this.refName levels[--i]] = this;
                    
    /**
                     * @type Ext.Container
                     * @property refOwner
                     * The ancestor Container into which the {@link #ref} reference was inserted if this Component
                     * is a child of a Container, and has been configured with a <code>ref</code>.
                     */
                    
    this.refOwner t;
                }
            }
        },

        
    removeRef : function() {
            if (
    this.refOwner && this.refName) {
                
    delete this.refOwner[this.refName];
                
    delete this.refOwner;
            }
        }, 
    Is this planned for Ext4 or was it intentionally removed?

    If it has been removed, what is the best-practice alternative? There are times when validators and listeners aren't enough and manually instantiating is messy. Setting itemId on the sub-component and using Ext.getCmp(itemId) works but seems cumbersome and requires itemIds to be globally unique. For form fields, I can use Form.findField(name) but I was under the impression that it created extra overhead.

  2. #2
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    Default


    Have a look at ComponentQuery and down/up/child on Containers
    -

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