How to call functions within a XTemplate (itemTpl)

Question

I would like to use Ext\'s String method on some text that will be output to the view.

For example:

itemTpl: [
    ...
    \'

        

Answer 1

Note: The example below does not work as expected! Look at zelexir answer for clarification!

You can use memberfunctions

itemTpl: [
    ...
    '',
    '',
        '
{post_text_teaser}
',
        '
{timestamp}
',
    '',
        '
{[this.doAction(post_text_teaser)]}
',
    ...,
    {
        // XTemplate configuration:
        disableFormats: true,
        // member functions:
        doAction: function(name){
           return Ext.String.ellipsis(name + "\", 4);
        }
    }
]