For demonstration, I have created a category "No Subcategory" with no dependent values.
onChange of the category field, wrote the below script:
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue == '') {
return;
}
//Type appropriate comment here, and begin script below
var ga = new GlideAjax('SubCategoryExists');
ga.addParam('sysparm_name',"ifSubCategoryExists");
ga.addParam('sysparm_category',newValue);
ga.getXML(HelloWorldParse);
}
function HelloWorldParse(response) {
var answer = response.responseXML.documentElement.getAttribute("answer");
if ( answer == "No Subcategory")
{
g_form.setDisplay("subcategory", false);
}
else
{
g_form.setDisplay("subcategory", true);
}
}
The corresponding script include is as below. Make sure to make it client callable.
var SubCategoryExists = Class.create();
SubCategoryExists.prototype = Object.extendsObject(AbstractAjaxProcessor, {
ifSubCategoryExists: function() {
var iChoice = new GlideRecord('sys_choice');
iChoice.addEncodedQuery('name=incident^element=subcategory^dependent_value='+this.getParameter('sysparm_category'));
iChoice.query();
if(iChoice.next())
{
return "Subcategory Exists";
}
else
{
return "No Subcategory";
}
},
type: 'SubCategoryExists'
});
The client script is written on "onChange". You might want to extend it to the onLoad of the form as well.
I have tested this and it works. Let me know how it goes for you.
