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Cannot read property 0 or null javascript error.

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Posted on by Community Member

hi,

i get lookup filed value and set in single line of text field through java script in on save event.

when there is no value in lookup field on save its throwing error like " can not ready property "0" or null.

Please help.

below screen shots of code and error for reference.

3414.Capture-1.PNG 4571.Capture2.PNG

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a33ik 84,331 Most Valuable Professional on at

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Hello,

Try to replace lookupfield.getValue with lookupfield.getValue()

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thonda Microsoft Employee on at

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if(lookupfield.getValue() != null && lookupfield.getValue()[0] != null){

var lookupname = lookupfield.getValue()[0].name;

}

The above should solve the issue, in your logic if(lookupfield.getValue != null) it only checks if array object exists, but fails to check if any elements exists in array before you call name property on 0th element.

Regards,

Praveen Thonda

D365 Support Engineer

Microsoft Corporation

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LeoAlt 16,331 Moderator on at

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Hi partner,

You should replace the "getValue" with "getValue()" in the condition.

"can not read property 0" means "lookupfield.getValue()" is null, which means your lookup field may not contians value.

About how to use js to work with lookup field, please refer to the following code.

    // GET and SET Lookup / Customer field value

    var functionName = function (executionContext) {

        // Access the field on the form

        var field = executionContext.getFormContext().getAttribute("parentaccountid");

        // Verify it does exist on the form

        if (field != null) {

            // Get its field value; Returns the Lookup object

            var value = field.getValue();

            //Make sure the lookup field contains data

            if(value!=null){

            // To get the Id, Name and Entity Name (account/contact)

            var reocord_id = field.getValue()[0].id;

            var record_name = field.getValue()[0].name;

            var record_entityName = field.getValue()[0].entityType;

            }



            // Set its field value

            field.setValue([{

                id: reocord_id,

                name: record_name,

                entityType: record_entityName

            }]);

        }

    }

Best Regards,

Leo

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