how to use on change client script to make fields disabled?

[Servicenow10]

hi 

I have one form where I have one category  drop down field with 3 options:

category: america , asia, london

now based on this category i need to disabled fields 

1. if i select america only my location field should be changeable (drop down field)
2. if i select asia then zone  field should be changeable (single line text)
3. if i select london then place field  field should be changeable  (single line text)

and on load of this form i need location,zone, place should only be readable..... how can i achieve this am new to snow so please help me to complete this

thanks in advance!!

[Jaspal Singh · Accepted solution]

Hi,

Use onload client script for setting location, zone & place field to be read-only by below script.

function onLoad() {
   //Type appropriate comment here, and begin script below
	g_form.setReadOnly('location',true);//replace locationwith appropriate dictonary name of field

   g_form.setReadOnly('zone',true);//replace zone with appropriate dictonary name of field
g_form.setReadOnly('place',true); //replace place with appropriate dictonary name of field
}

Use onChange client script as below for Category field

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
   if (isLoading || newValue === '') {
      return;
   }

   //Type appropriate comment here, and begin script below
	var catis=g_form.getValue('category');
	if(catis=='America')
   {
	   g_form.setReadOnly('location',false);
   }
	else if(catis=='Asia')
   {
	   g_form.setReadOnly('zone',false);
   }
	
		else if(catis=='London')
   {
	   g_form.setReadOnly('location',false);
   }
}

Make sure you replace the dictonary name accordingly as per the names in the instance.

Thanks,

Jaspal Singh

Hit Helpful or Correct on the impact of response.

[Servicenow10]

thankyou so  much for your time it worked!!

[Lukasz Bojara]

Hi,

The easiest way to do this is to use UI Policy. Also when it comes to making fields visible/hidden, read-only or mandatory it is Best practice to use UI Policy. And if you do not need to hide entire sections in most case this a no-code approach.

For example, make a field visible if category is America:

Result will be this:

This way you can group behaviours based on the conditions. E.g. when a category is America make some fields visible, some hidden, some readonly etc.

Hope this helped.

Best regards,
Łukasz