Hide Choice field when it has no Options
If you have a dependent field, but not for each selection have options, you can hide the field if no options are available.
For example you have Subcategory, which is dependent on a Selected category. Not for each Categories you have a Subcategory to select. And when you have no Options for subcategory, you want to hide that Subcategory field.
Determine the options; before the Service Portal/Mobile
To hide the subcategory if there are no subcategories available for the Category previously you could use
g_form.getOptions()However that is not supported in the Service Portal/mobile:
Also suggested in the Community but also not supported in Service Portal/mobile:
var values = [];
var sel = g_form.getElement('<choicefield>');
for (var i=0, n=sel.options.length;i<n;i++) {
if (sel.options[i].value) values.push(sel.options[i].value);
}
alert(values.join(","));Reference:
Supported options
That leaves 2 options:
Option 1: Without Script include/Glide Ajax
Option 1 onChange catalog client script without GlideAjax:
(adjust the client script to only use the setVisible)
Details can be found here:
https://www.jds.net.au/servicenow-choice-list-dependencies/
A suggested improvement from Kieran:
(adjusted to our use case below)
possibleChoices.query(responseChoices);
function responseChoices(response) {
if (response.next()) {
g_form.setVisible('subcategory', true);
}
else{
g_form.setVisible('subcategory', false);
}
}
Option 2: With Script include/Glide Ajax
Or you can do it with an Ajax Call to a Client Callable Script Include:
onChange client script:
function onChange(control, oldValue, newValue, isLoading) {
if (isLoading || newValue == '') {
return;
}
var hasSubCategories = new GlideAjax('global.producerHelper');
hasSubCategories.addParam('sysparm_name', 'hasSubCategories');
hasSubCategories.addParam('sysparm_category', newValue);
hasSubCategories.getXMLAnswer(processedHandler);
function processedHandler(answer) {
if (answer.length > 0) {
g_form.setVisible('subcategory', true);
}
else {
g_form.setVisible('subcategory', false);
}
}
}
Client Callable Script Include:
var producerHelper = Class.create();
producerHelper.prototype = Object.extendsObject(AbstractAjaxProcessor, {
hasSubCategories: function () {
var choices = [];
var category = this.getParameter('sysparm_category');
var gr = new GlideRecord('sys_choice');
gr.addQuery('dependent_value', category);
gr.addQuery('name', 'incident');//update table if needed
gr.addQuery('element', 'subcategory');//replace with your sub category field
gr.query();
while (gr.next()) {
choices.push(gr.value);
}
return choices.join(',');
},
type: 'producerHelper'
});