how to prefill date in service catalog

[TMKAM]

Hi, 

i have create 3 variable and what i would like to achieve as per below scenario.

I would like to achieve that when i enter variable 1 start date and select the variable 2 - 3 day or 5 day it will automatically calculate and insert to variable 3 end date

variable 1 - start date

variable 2 - select box with multiple selection

variable 3 end date

scenario 1

variable 1 - i select date is 2025-03-05

variable 2 - i select 5 day

variable 3 - should automatically insert 2025-03-10

scenario 2

variable 1 - i select date is 2025-04-05

variable 2 - i select 10 day

variable 3 - should automatically insert 2025-04-15

im not sure what scripts and how to create a script to achieve above scenario.

thank you

[Ankur Bawiskar]

@TMKAM 

ensure the choice value for that select box has value like 1 or 2 or 5

check this

Adding Days to a date via Script 

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Ankur Bawiskar · Accepted solution]

@TMKAM 

Sample Scripts below

Script Include: It should be client callable

var checkRecords = Class.create();
checkRecords.prototype = Object.extendsObject(AbstractAjaxProcessor, {

calculateDate: function(){

var date = this.getParameter('sysparm_date');
var days = this.getParameter('sysparm_days');
var gdt = new GlideDateTime(date);
gdt.addDaysUTC(parseInt(days));
return gdt.getDate();
},

type: 'checkRecords'
});

onChange client script:

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

var ga = new GlideAjax('checkRecords');
ga.addParam('sysparm_name', "calculateDate");
ga.addParam('sysparm_date', g_form.getValue('variable1')); // give here date variable name
ga.addParam('sysparm_days', g_form.getValue('variable2')); // give here days variable name
ga.getXMLAnswer(function(answer){
if(answer != ''){
g_form.setValue('variable3', answer); // give proper variable name here
}
});
//Type appropriate comment here, and begin script below

}

If my response helped please mark it correct and close the thread so that it benefits future readers.