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Exam PL-400 topic 5 question 5 discussion

Actual exam question from Microsoft's PL-400

Question #: 5
Topic #: 5

HOTSPOT -
You are examining code written by another developer that is not functioning correctly. There are no other JavaScript or business rules in use on the form.
This code is properly registered to the OnChange event of the telephone1 field on an account entity form. The main operation is to update the primary contact's phone number when the account phone number changes. The primary contact field is a lookup. (Line numbers are included for reference only.)

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
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Suggested Answer:

by lesiris at Aug. 24, 2021, 9:19 a.m.

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Nielson

Highly Voted 3 years, 3 months ago

Second answer should be 'no'. primaryContact on line 11 will be null resulting in javascript error on line 12 (primaryContact[0] => Cannot read properties of null)

upvoted 33 times

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ETU69

Highly Voted 3 years, 2 months ago

To summarize: Yes, No, Yes should be the correct answers.

upvoted 27 times

ziggy1117

1 year, 4 months ago

Xrm.webapi is an asynch call.. so it can happen that the Done dialog box will display before xrm.webapi finishes

upvoted 7 times

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Juan0414

Most Recent 3 months, 3 weeks ago

Yes - https://learn.microsoft.com/en-us/power-apps/developer/model-driven-apps/clientapi/reference/formcontext-ui/getformtype#return-value No - Line 12 would fail because of null No - The alert on line 21 will be shown regardless the call is successful or not, also the order is not guaranteed as it is an async call

upvoted 1 times

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hai297

9 months ago

Yes No: will throw error on line 12 No: Always show popup even any event on update record, and the update is async

upvoted 7 times

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700157a

1 year, 4 months ago

Answer is Y,N,N

upvoted 5 times

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ziggy1117

1 year, 4 months ago

Y N - the code will fail if the primaryContact is null, code will stop and will throw an error N - no because Xrm.WebApi is an Asynch call the the "Done" dialog box is outside the Asynch call. So it can (probably most of the time) happen that the Done dialog box will even display first

upvoted 7 times

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yuko17

1 year, 7 months ago

Yes、No、Yes

upvoted 2 times

yuko17

1 year, 7 months ago

Yes,No,No

upvoted 3 times

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CRMBug

2 years, 1 month ago

Yes ,No , No

upvoted 3 times

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No_Doubt

2 years, 1 month ago

1- Yes: since formtype 2 is update 2- No: JS error, reading attribute from a null object before the call of the API 3- No: this is an async call, so saying ALWAYS make it wrong.

upvoted 5 times

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Flatternschuchtern

2 years, 3 months ago

The correct answers are: 1) Yes 2) No, it will crash before getting to callback. 3) No, it is outside of callback and will not be awaited.

upvoted 6 times

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northstar88

2 years, 3 months ago

To help reinforce, the last one should be NO. Xrm.WebApi.updateRecord is an async promise function. Once the line is called, client will not wait for the result and will immediately call line 21. If the update is REALLY quick, I think it is possible for line 21 to show after update is completed and line 15 called. However it is unlikely, and since the answer has "always" in it, the statement is false. Hence, No.

upvoted 3 times

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CE_Team_Gold

2 years, 6 months ago

Y,N,N - Clearly. Source: 4 years as a Developer in Dynamics 365 CE. Explanation: UpdateRecord is async.The function gets called and then the 21st line gets run directly after. After the callback async function finishes, the success/errorcallback-alert will be shown. The 3. Statement even says "always" - which is a clear indicator for a false statement here.

upvoted 7 times

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