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Here's a slight twist on a previous entry where I showed how to
dynamically add choice values to an Add Task page. For this one, we want to pre-fill some case properties on Add Case page and set one of the property fields to be read only. Here's how:

• Add a Scrip Adapter widget to your Add Case page and rename it "Prefill"
• Wire the Page Container's Send New Case Information event to the inbound event on your Prefill Script Adapter
• Add the following script to your Script Adapter, replacing the property name with one from your solution

/* Requires ICM 5.2.0.1 */

console.log(this.name,": ",payload);

require(["icm/base/Constants", "icm/model/properties/controller/ControllerManager"], function(Constants, ControllerManager) {
   /* Get the coordination and editable objects from the event payload. */
   var solutionPrefix = payload.caseType.getSolution().getPrefix();
   var coordination = payload.coordination;
   var editable = payload.caseEditable;

   /* Change me to your property name */
   var theProperty = solutionPrefix + "_CaseStage";

   /* Use the LOADWIDGET coordination topic handler to obtain the controller binding */
   /* for the editable and to update the properties. */
   coordination.participate(Constants.CoordTopic.LOADWIDGET, function(context, complete, abort) {
      /* Obtain the controller binding for the editable. */
      var collectionController = ControllerManager.bind(editable);

      /* Start a batch of changes. */
      collectionController.beginChangeSet();

      /* Make the updates to the properties. */
      collectionController.getPropertyController(theProperty).set("value", "0");
      collectionController.getPropertyController(theProperty).set("readOnly", true);

      /* Complete a batch of changes. This tells all subscribed widgets to refresh. */
      collectionController.endChangeSet();

      /* Call the coordination completion method. */
      complete();
   });

   /* Use the AFTERLOADWIDGET coordination topic handler to release the controller binding for the editable. */
   coordination.participate(Constants.CoordTopic.AFTERLOADWIDGET, function(context, complete, abort) {
      /* Release the controller binding for the editable. */
      ControllerManager.unbind(editable);

      /* Call the coordination completion method. */
      complete();
   });
});