ExtJs 3.4 combobox autocomplete interchangeably of character position - extjs

Question

I am using extJs 3.4 combobox autocomplete, i want autocomplete search to work interchangeably of characters position.
For example when i type 'v' it autocompletes to vanessa (it is working well) but when i type 'a' it doesnt autocomplete.
i would like to autocomplete by any character(that exist) in any site.
Something like this
a - vanessa,daniela
s - vanessa
or ssa - vanessa
This is my code
xtype: 'combo',
fieldLabel: 'prov',
id : 'lang',
store:[['tr','vanessa'],['ru','daniela'],['en','English']],
mode: 'local',
triggerAction: 'all',
selectOnFocus:true,
listeners: {
afterrender: function(combo) {
var recordSelected = combo.getStore().getAt(1);
combo.setValue(recordSelected.get('field1'));
}
}
Thank you and i apologize for my grammar it isn't very good.

Answer 1

You have to somewhat change the behaviour of the doQuery method. As you see in the code, we're lucky because there's an event giving us the opportunity to do that without hacking the combo too much :) Furthermore, if we pass a regex to the store's filter method, it will ignore its other arguments (the one we would have wanted to pass is anyMatch... but the combo doesn't give us the opportunity).
So, we just have to hook on this event and transform the query string property into a regex! Here's how:
Ext.create({
xtype: 'combo',
renderTo: Ext.getBody(),
fieldLabel: 'prov',
id: 'lang',
store: [
['tr', 'vanessa'],
['ru', 'daniela'],
['en', 'English']
],
mode: 'local',
triggerAction: 'all',
selectOnFocus: true,
listeners: {
beforequery: function(q) {
// we don't want to crash if there's nothing in there
if (q.query) {
// we need the length later in the doQuery function,
// for respecting minChars
var length = q.query.length;
q.query = new RegExp(Ext.escapeRe(q.query));
// pretend I am a string, eh eh
q.query.length = length;
}
}
}
});
You may want to override the Ext.form.ComboBox class to add this as an option (I would call it anyMatch) since that's a pretty common requirement.