Cannot read properties of null (reading '0')

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Posted on by cahickm2

I have added this piece of code to populate a single line of text field with the name from a related lookup. It works fine when you put a value in the lookup but if you clear the value from the look up it throws this error: Cannot read properties of null (reading '0'). I know it is throwing that because the field is null. What do I need to do to this code to make it not execute if the lookup is null?

function planName(executionContext) {
   var household = formContext.getAttribute(/si_household/).getValue()[0].id;
   var householdEntityType = formContext.getAttribute(/si_household/).getValue()[0].entityType;
   var householdName = formContext.getAttribute(/si_household/).getValue()[0].name;

   var hhLookup = new Array();
   hhLookup[0] = new Object();
   hhLookup[0].id = household;
   hhLookup[0].entityType = householdEntityType;
   hhLookup[0].name = householdName;

formContext.getAttribute(/ah_planname/).setValue(hhLookup[0].name);
}

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Answers (1)

OmPrakash 4 on at

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Cannot read properties of null (reading '0')

Add a condtion before getting the id, entity etc..,

if(formContext.getAttribute(/si_household/).getValue() != null &&

formContext.getAttribute(/si_household/).getValue() != undefined)

{
//your code

}

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Verified answer

Nishkarsh Vaish 335 on at

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Cannot read properties of null (reading '0')

Hi

Change your function as below.

function planName(executionContext) {
   var houseHoldLookup = formContext.getAttribute(/si_household/).getValue();
   if(houseHoldLookup != null)
   {
       var household = houseHoldLookup[0].id;
       var householdEntityType = houseHoldLookup[0].entityType;
       var householdName = houseHoldLookup[0].name;
       var hhLookup = new Array();
       hhLookup[0] = new Object();
       hhLookup[0].id = household;
       hhLookup[0].entityType = householdEntityType;
       hhLookup[0].name = householdName;
       formContext.getAttribute(/ah_planname/).setValue(hhLookup[0].name);
   }
}

Please mark as verified, if it resolves your problem.

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