Unanswered

Model driven apps - web resource JS - cannot read property 0 of null - when lookup field value is cleared

(1) Share

Report

Posted on by VeeraVaishnavi

Hi,

I am receiving error as "cannot read property 0 of null - when lookup field value is cleared" while editing and adding record in form. Kindly help in resolving the issue.

I searched in many forums but it didn't help in resolving the issue.

Name 1 - text field

Name2 - lookup field.

The if function works properly. When lookup field is cleared, it throws error as "cannot read property 0 of null "

My code is below:

//name validation
function namevalidation (executionContext) {

var formContext = executionContext.getFormContext();
var BPN = formContext.getAttribute("name1").getValue();
var PBPNname = formContext.getAttribute("name2").getValue()[0].name;

if (!PBPNname) {
return;
}

if (BPN == PBPNname)
{
alert ("Hi");
alert(BPN);
alert(PBPNname);
Xrm.Navigation.openAlertDialog({ text: "Name1 cannot be same as Name2" });
Xrm.Page.getAttribute("name2").setValue(null);

}

Categories:

Building Power Apps

I have the same question (0)

All responses (5)

Answers (1)

poweractivate 11,078 Most Valuable Professional on at

Like (0)

Report

@VeeraVaishnavi

1) On which specific line does it say it throws the error (to check this, press F12 on keyboard then reproduce the error)?

2) In case, what is a screenshot of your form where it is happening (if you are allowed to give it).

Was this reply helpful? Yes No
VeeraVaishnavi 69 on at

Like (1)

Report

The error thrown is as follows:
One of the scripts for this record has caused an error. For more details, download the log file.
Cannot read property '0' of nullSession Id: c9106d20-41db-4879-923e-158f1fe8f696Correlation Id: dc1c11a1-3481-4837-98f5-a46bb93649cbEvent Name: onchangeWeb Resource Name: XXXXXXX Solution Name: ActivePublisher Name: DefaultPublishercorizance2Time: Sun Nov 29 2020 13:34:04 GMT+0530 (India Standard Time)Download Log File
Cannot read property '0' of null
Session Id: c9106d20-41db-4879-923e-158f1fe8f696
Correlation Id: dc1c11a1-3481-4837-98f5-a46bb93649cbEvent Name: onchangeWeb
Resource Name: XXXXXXXXX
Solution Name: ActivePublisher Name: DefaultPublishercorizance2Time: Sun Nov 29 2020 13:34:04 GMT+0530 (India Standard Time)

I have added this JS for onchange event handling for the lookup field name2.

While entering lookup field - "name2" (optional field), I need to validate it against name1 (required field) whether they are equal.

If equal - throw error.
If not equal - no action required.
If I clear the lookup field - the script throws error.

Was this reply helpful? Yes No
poweractivate 11,078 Most Valuable Professional on at

Like (0)

Report

@VeeraVaishnavi

When you download the log file what does it say in there? Or if allowed to, can you attach the log file here in next reply or paste its contents in next reply?

Was this reply helpful? Yes No
VeeraVaishnavi 69 on at

Like (0)

Report

Download file has below contents:

I have hidden few details as XXX

TypeError: Cannot read property '0' of null
    at namevalidation (https://xxx.dynamics.com/%7b637422327150024344%7d/webresources/XXXXXX:22:86)
    at ul.executeFunction (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:1122:3526)
    at ul.execute (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:1122:3171)
    at https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:102:20815
    at i (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:227:88)
    at V._executeIndividualEvent (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:102:20791)
    at V._executeEventHandler (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:102:18460)
    at Object.execute (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:102:17942)
    at w._executeSyncAction (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:746:692)
    at w._executeSync (https://xxx.dynamics.com/uclient/scripts/app.js?v=1.4.1809-2011.1:746:419)

Was this reply helpful? Yes No
Verified answer

VeeraVaishnavi 69 on at

Like (0)

Report

Hi, Senior helped in resolving the issue. Posting the code. "Cannot read 0 property of null" is not occurring and the functionality works as expected. Thanks.

// name validation
function namevalidation (executionContext) {
var formContext = executionContext.getFormContext();
var BPN = formContext.getAttribute("name1").getValue();
var PBPNnameObj = formContext.getAttribute("name2").getValue();
if(PBPNnameObj != null){
var PBPNname = formContext.getAttribute("name2").getValue()[0].name;
//alert(PBPNname);
if (!PBPNname) {
        return;
    }
if (!BPN) {
        return;
}
if (BPN == PBPNname)
{
alert ("Hi");
alert(BPN);
alert(PBPNname);
Xrm.Navigation.openAlertDialog({ text: " Name1 cannot be same as Name2" });
Xrm.Page.getAttribute("name2").setValue(null);
}
}
}

Was this reply helpful? Yes No