Clear Options except 'None'

Shihab Ahmed · ‎02-27-2017

Hi All,

I am trying to develop a catalog client script for a Service Portal Item.

Below is the code I am using:

--------

var cat = newValue;

g_form.clearOptions('subcategory');

var choice = new GlideRecord('sys_choice');

choice.addQuery('dependent_value', cat);

choice.query(function(choice){

while(choice.next()){

g_form.addOption('subcategory', choice.value, choice.value);

}

});

--------

I want to dynamically populate subcategory based on selected category.

And every time, category changes, it should change the list of available subcategory.

g_form.clearOptions('subcategory'); , does the job but it also makes the default '--None--' un-selectable.

I want to remove all options except default '--None--'.

g_form.getControl().options.length =1;, was doing the same job easily for other catalog items but this doesn't work for Service Catalog.

Can someone, help me to fix this issue.

Thanks

Shihab

srinivasthelu · ‎02-27-2017

Hi Shibab,

addOption accepts the choiceIndex which you can use to specify the order. This will solve your first issue.

void addOption(fieldName, choiceValue, choiceLabel, [choiceIndex]))

Adds a choice to a choice list field. If the index is not specified, the choice parameter is added to the end of the list.

Optional: Use the index field to specify a particular place in the list.

Parameters:

fieldName - specifies the field.

choiceValue - the value stored in the database.

choiceLabel - the value displayed.

choiceIndex (optional) - order of choice in the list.

Returns:

void

View solution in original post

Robert Duca · ‎03-09-2020

this is the best way to do this... it enforces the mandatory UI policies and prevents the submission of a '--none--' selection.

nagarjun2 · ‎03-13-2020

Add below line after clearOptions

g_form.addOption('field name',' ','--None--')

Thanks

dhinesh2205 · ‎08-19-2020

while(choice.next()){

g_form.addOption('subcategory',"","--None--"");

g_form.addOption('subcategory', choice.value, choice.value);

}

GBall · ‎07-02-2021

I know this topic is a few years old now, but I think I figured out a better way to do this. Since I still found this on Google hopefully it can still help others.

Below your g_form.clearOptions('fieldname'); call, add:

g_form.addOption('fieldname', '', '-- None --', 0);

This appears to work exactly the same as the OOB 'none' option, including allowing mandatory field enforcement and is compatible with the g_form.clearValue('fieldname'); method.