How do I configure ServiceNow to add default checkboxes for each MRVs item

[SamuelChang]

I want to add a checkbox for each item, which only one can be selected (the other will gray out).

Here is what I have in mind

If I select the first item, the second checkbox should be gray out vice versa. I've looked everywhere, but couldn't find any solution, if anyone have any guidance or alternatives I would be greatly appreciate it!

[Brad Bowman]

Hi Samuel,

This onLoad Catalog Client Script that applies to the MRVS, not the Catalog Item, will do that when adding or editing a row:

function onLoad() {
	var mrvs = g_service_catalog.parent.getValue('default_user_mrvs'); //internal MRVS name
	if (mrvs.length > 2) { //native UI returns [] for empty MRVS value whichc causes parsing error
		var obj = JSON.parse(mrvs);
		for (var i=0; i<obj.length; i++) { //loop through the existing MRVS rows
			if (obj[i].default_user == 'true') { //mrvs checkbox variable name
				g_form.setReadOnly('default_user', true);
			}
		}
	}
}

[SamuelChang]

Brad,

Thank you for your quick response tried it on my PDI, but it did not work like I really intended. I added the first two unchecked, the third one checked.

When I added the new row the default box still available for me to select, but if I select it then it will set to read-only, and still added as default. So now I have 2 default users (which isn't the goal)

Maybe there is something wrong with the logic?

[Brad Bowman]

It sounds like maybe you are running the script onChange instead of onLoad, or maybe you have an old script or UI policy in place from a previous attempt?  When I execute your test steps, adding the new (4th) row opens the Add Row dialog with the Default checkbox read-only/grayed out.

[SamuelChang]

Arghhh I see, but I can't reverse it aka edit the default and uncheck the checkbox since it's read-only