Force server TextChanged event from javascript

Way 1:

function DoPostBack()
   __doPostBack("txt_sssn_dt", "TextChanged");

Calling ASP.NET server-side events using JavaScript

Way 2:

Calling Server Side function from Client Side Script

Way 3:

one of the way to set focus lost like this

function texboxchange() {
        var txtBox = document.getElementById('<%= TextBox4.ClientID %>');
        var count = txtBox.value.length;
        if (count == 2) 
           document.getElementById('<%= TextBox12.ClientID %>').focus();
           return true; // this will call textbox changed event.

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