Client UI Scripts: trying to display a warning message in Incident form field

[CesarV_]

I am attempting to generate a warning message in the 'On hold reason' field when an incident form meets this criteria prior to saving:

• Caller= Event Management
• State= On Hold
• On hold reason= Awaiting Caller

I'm new to SMV development work and struggle with scripting. I felt like the below code was going to work but it's not generating the message. I appreciate an feedback on this, details below.

Mock up of the intended functionality:

Client UI script settings: 

Current code:

function onLoad() {

    // Check if the form is for a new or existing incident

    if (g_form.isNewRecord() || g_form.getValue('state') == '3') { // 3 = On Hold in ServiceNow

        // Add an onChange listener to the caller_id field

        g_form.addDecoration('caller_id', 'onChange', checkConditions);

        // Add an onChange listener to the state field

        g_form.addDecoration('state', 'onChange', checkConditions);

        // Add an onChange listener to the on_hold_reason field

        g_form.addDecoration('hold_reason', 'onChange', checkConditions);

        // Run the check on form load in case values are already set

        checkConditions();

    }

}

function checkConditions() {

    // Get field values

    var caller = g_form.getValue('caller_id');

    var state = g_form.getValue('state');

    var holdReason = g_form.getValue('hold_reason');

    // Check if caller contains "Event Management" (sys_user table reference)

    var callerName = '';

    if (caller) {

        var gr = new GlideRecord('sys_user');

        if (gr.get(caller)) {

            callerName = gr.getValue('name') || '';

        }

    }

    // State: On Hold = 3, Hold Reason: Awaiting Caller = 3 (default ServiceNow values)

    if (callerName.indexOf('Event Management') !== -1 &&

        state == '3' &&

        holdReason == '3') {

        // Display warning message in the on_hold_reason field

        g_form.showFieldMsg('hold_reason', 'Warning: Incident is Awaiting Caller for Event Management. Please select different On hold reason.', 'error');

    } else {

        // Clear any existing field message if conditions are not met

        g_form.hideFieldMsg('hold_reason');

    }

}

[J Siva · Accepted solution]

Hi @CesarV_ 
You can acheive this by creating one UI policy on the Incident table. PFB.
UI policy:

If you want to show that warning message only on the field changes, then uncheck the "on load" check box.

Else, if you want to show that whenever the condition statifies, then check the "On load" check box.

UI policy script:

function onCondition() {
    g_form.showErrorBox("hold_reason", "Warning: Incident is Awaiting Caller for Event Management. Please select different On hold reason");
}

Output:

Regards,
Siva

[Ankur Bawiskar]

@CesarV_ 

Thank you for marking my response as helpful.

As per new community feature you can mark multiple responses as correct.

If my response helped please mark it correct as well so that it benefits future readers.

[CesarV_]

Done, thank you @Ankur Bawiskar!