Hello @DeepikaR1661877 
What value you got in alert statement? Try to check value you are getting for both Category & Subcategory.

Does it pass if loop? If yes, then it will work. Also, the on change is written on which field is it Category or Subcategory? 

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Thanks & Regards
Viraj Hudlikar.

Hi @Viraj Hudlikar ,

There is no value getting by using the alert , change is written on the Subcategory field 

@DeepikaR1661877  - If no alert means value not coming proper. Since this on change client script on subcategory so you can get its backend value by using newvalue easily.

Try to put alert as below and see when you change subcategory what is coming up and then use same value to compare in your if loop.

alert("Category"+g_form.getValue('category'));
alert("SubCategory"+g_form.getValue('subcategory'));

Below is sample code for client script and it works for me see if this can help you. 

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

   //Type appropriate comment here, and begin script below
alert("Category"+g_form.getValue('category'));
alert("SubCategory"+g_form.getValue('subcategory'));
   var subcategory = newValue;
   var category = g_form.getValue('category');
   if(subcategory == 'email' && category == 'inquiry'){
	g_form.addInfoMessage("This is infomessage");
   }else{
	g_form.clearMessages();
   }
   
}

If my response has helped you hit helpful button and if your concern is solved do mark my response as correct.

Thanks & Regards
Viraj Hudlikar.

I have modified the code, It's working but the info mes is not populating under subcategory.