how to make all the variables read only on SC tasks after the task gets closed

[VIKAS MISHRA]

On the task form i can see all the variables are still editable after the task gets closed, how to i make them not ready only and i want this for any kind of SC_task raised in any cataloge item.

[VIKAS MISHRA]

I will check with vendor like why this script is not working , meantime can you please help me with other code that i need to add here only in this on load client script.

Actually i need to make all the variables read only acept 2 different cataloge items tasks and for one another cataloge i need to make only few variables read only

[BharathChintala]

@VIKAS MISHRA 

you can write below if client script 

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

if(item !='sysidof item1' && item != 'sysidid ofitem2'){

write read only script here

}