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    Lightbulb ComboBox.setValue (remote/local)

    ComboBox.setValue (remote/local)


    Here's a piece of code that allows you not to ever think about the combobox's store state when dealing with setValue() with a local or remote combobox. Calling setValue multiple times on a remote combobox will work as well, it will automatically load the value from the server first (by sending the value as the [valueField] param to the server) and then select it. Calling setValue() on a remote combobox will also make sure that any active requests are cancelled before proceeding. In addition, the callbacks won't execute if the combobox has been destroyed.

    Code:
     
    Ext.override(Ext.form.ComboBox, {
        setValue: Ext.form.ComboBox.prototype.setValue.createInterceptor(function(v, loadRecord) {
            loadRecord = !(loadRecord === false);
            if (!this.isDestroyed && loadRecord) {
                var cbo = this,
                    store = cbo.store,
                    isLocalMode = cbo.mode === 'local',
                    vField = cbo.valueField,
                    callback = function(rec, options, success) {
                        if (success && cbo.store) {
                            cbo.setValue(v, false);
                        }
                    };
                
                if (isLocalMode && !Ext.isDefined(store.totalLength)) {
                    store.on({
                        'load': callback,
                        scope: cbo,
                        single: true
                    });
                    
                    if (!store.autoLoad) {
                        store.load();
                    }
                    return false;
                } 
                else if (!isLocalMode) {
                    var rec = cbo.findRecord(vField, v);
                    
                    if (!rec) {
                        var readRequest = store.proxy.activeRequest.read,
                            params = {};
                        
                        if (readRequest) {
                            readRequest.conn.abort();
                        }
                        
                        params[vField] = v;
                        store.load({
                            callback: callback,
                            params: params
                        });
                        return false;
                    }
                }
            }
        })
    });
    Last edited by plalx; 27 May 2011 at 11:04 AM. Reason: Refactored with createInterceptor

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