Sample JavaScript code to open an item in edit mode in Aras Innovator 12.0

OpenItemInEditMode.js

/*
 *  We need to wait for the item's form to fully load before we switch the window to edit mode.
 *  Luckily, aras.uiShowItem returns a Promise that happens to resolve once the window loads. This
 *  means we can pass in a function using Promise.then(ourFunction) that will be called after the
 *  Promise resolves and the item window is loaded.
 */
aras.uiShowItem("Part", "64B2100E21B44980B42FB445951310BF").then(function()
{
  // Look up the tab that was just loaded
  var myItemWin = aras.uiFindWindowEx("64B2100E21B44980B42FB445951310BF");
  
  // We now want to call the same function thats called when the user clicks the Edit button on the
  // item tab. Because this button is stored in CUI, we can just look up what the On Click handler
  // is. In this case, the On Click handler is a JavaScript Method item called cui_ivicb_edit_click
  // which simply calls this standard function below.
  myItemWin.onEditCommand();
});

/*
 * In my testing, I noticed some JavaScript errors when using the function above. I think this is because
 * the window isn't fully loaded by the time we run onEditCommand(). These JavaScript errors didn't seem
 * to impact functionality nor would they be visible to end users, but we it's still worth trying to resolve
 * this problem.
 *
 * To do this, we'll use setTimeout() to call onEditCommand() after a set number of milliseconds. This should
 * hopefully give the window more time to load which should resolve the JavaScript errors.
 */
aras.uiShowItem("Part", "64B2100E21B44980B42FB445951310BF").then(function()
{
  setTimeout(function() {
    var myItemWin = aras.uiFindWindowEx("64B2100E21B44980B42FB445951310BF");
    myItemWin.onEditCommand();
  }, 1000); // <-- You may need to tweak this value depending on the speed of your own environment.
});