JSFiddle - React, Tailwind, and code Playground

For SO question http://stackoverflow.com/questions/4662646/dojo-dojo-onblur-events

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/dojo/1.5/dijit/themes/claro/claro.css">
Vehicle:
<input dojoType="dijit.form.ComboBox"
store="xvarStore"
value=""
searchAttr="name"
name="vehicle_1"
id="vehicle_1"
onBlur="isValid"
/>
Descriptor:
<input type="text"
dojoType="dijit.form.TextBox"
value=""
class=lighttext
style="width:350px;height:19px"
id="filter_value_1"
name="filter_value_1"
onBlur="isValid"
/>

Vehicle:
<input dojoType="dijit.form.ComboBox"
store="xvarStore"
value=""
searchAttr="name"
name="vehicle_2"
id="vehicle_2"
onBlur="isValid"
/>
Descriptor:
<textarea 
dojoType="dijit.form.Textarea" 
id="filter_value_2"
name="filter_value_2" 
onChange="isValid"
></textarea>

JavaScript

dojo.require('dijit.form.TextBox');
dojo.require('dijit.form.Textarea');
dojo.require('dijit.form.ComboBox');
dojo.require('dojo.parser');
dojo.require('dojo.data.ItemFileReadStore');

var xvarStore;  


function isValid() {
    var
        //grab number off end of id of widget event fired on
        //(this method is normally called in the context of the blurred widget)
       /* num = this.id.match(/_(\d+)$/)[1],
        //grab both associated widgets based on that number
        tb = dijit.byId('vehicle_' + num),
        cb = dijit.byId('filter_value_' + num),
        ret;*/
    
    
 dd = dijit.byId("filter_value_2").value;
 if(dd.lenght>2){
 dijit.byId("filter_value_2").value = dd.substring(0,2);
 }
    //bail out if we somehow failed to find one or the other
   /* if (!tb || !cb) {
        return false;
    }
    
    //fields are valid if either both are filled or both are empty.
    //shortcut: boolean-negating both will coerce both to boolean,
    //for an easy comparison to each other.
    ret = ( !tb.get('value') == !cb.get('value'));
    console.log(num, ' valid? ', ret);*/
    console.log(dd);
    return dd;
}

dojo.ready(function() {
    xvarStore = new dojo.data.ItemFileReadStore({
        data: {
            identifier: 'id',
            items: [
                {
                id: 'R',
                name: 'red'},
            {
                id: 'B',
                name: 'blue'},
            {
                id: 'P',
                name: 'plaid'}
            ]
        }
    });
    dojo.parser.parse();
});