Disable HTML web resource control from CRM Form events

Call below function on CRM form event to access HTML web resource control by tag or Id

function DisableHTMLWebresouceControl()

{

//Get HTML web resource control

 var webRefCtrl = Xrm.Page.getControl('Your web resource ID from form').getObject();

 //web resource HTML document

 var htmlDoc=webRefCtrl.contentDocument;

 //get list of controls by tag name

 var ctrlList = htmlDoc.getElementsByTagName('select');

 //get list of controls by Id

 var ctrlById= doc.getElementById('textCtrl');

 //If web resource is not loaded yet, then call same function after some time.

  if(ctrlList[0]==null)

  {

     setTimeout(DisableHTMLWebresouceControl,1000)

     return;

  }

 

 // disable control in HTML web resource.

 ctrlList[0].disabled =true;

}