How to set initial filtering

The below example demonstrates initial application of filter in a textbox and a dropdown:

1. Either initial filter condition or value or both are defined in column.filter.crules[]

   { title: "Customer Name", dataIndx: "ContactName",
       filter: {               
           crules: [{
               condition: 'begin',  //set initial condition of filter
               value: 'P' //set initial value of filter
           }]
       }
   }