The answer is that the client controller fails to properly handle the asynchronous promise from $scope.server.get(), causing the success message to not display when the promise resolves after the user has already navigated or clicked again. This is because $scope.server.get() returns a promise that resolves asynchronously, and the widget’s ng-show='data.success' relies on the $scope.data object being updated before the user’s next action. On the ServiceNow CAD exam, this scenario tests your understanding of Service Portal widget async promise handling—a common trap is assuming server-side logging proves client-side success, when in reality the server script runs fine but the client never captures the response. Remember the key distinction: server execution and client response handling are separate concerns. A useful memory tip is “Promise before proceed”—always chain .then() on your async calls to ensure the UI updates only after the server confirms the record creation.
SNOW-CAD User Interface Development Practice Question
This SNOW-CAD practice question tests your understanding of user interface development. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a Service Portal that includes a custom widget for submitting hardware requests. The widget has a client controller that calls a server script to create a new record in the 'hardware_request' table. Recently, users have reported that when they click the 'Submit' button, the widget sometimes does not show a success message, and the record is not created. The developer reviews the server script, which uses gs.log to log errors, and sees no errors in the logs. The client controller uses $scope.server.get() to call the server. The widget template uses ng-show='data.success' to display a success message. Based on this scenario, what is the most likely cause of the intermittent issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The server script fails due to a mandatory field not being provided, but the error is not logged.
Why wrong: The developer checked logs and saw no errors.
B
The server script uses data.success = true; but the client controller does not read it.
Why wrong: The client controller receives data from the server.
C
The widget has a Client Script that conflicts with the server script.
Why wrong: Client Scripts are not used in Service Portal widgets.
D
The client controller does not handle the asynchronous response properly; the success message depends on the promise resolving before the user might navigate away or click again.
Asynchronous calls require proper handling of promises to update scope.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The client controller does not handle the asynchronous response properly; the success message depends on the promise resolving before the user might navigate away or click again.
The client controller uses $scope.server.get() to make an asynchronous call to the server script. If the user clicks 'Submit' and then navigates away or clicks again before the promise resolves, the success message (ng-show='data.success') may never display because the $scope.data object is not updated in time. The server script logs no errors because it executes correctly, but the client-side asynchronous handling fails to capture the response, leading to the intermittent issue.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The server script fails due to a mandatory field not being provided, but the error is not logged.
Why it's wrong here
The developer checked logs and saw no errors.
✗
The server script uses data.success = true; but the client controller does not read it.
Why it's wrong here
The client controller receives data from the server.
✗
The widget has a Client Script that conflicts with the server script.
Why it's wrong here
Client Scripts are not used in Service Portal widgets.
✓
The client controller does not handle the asynchronous response properly; the success message depends on the promise resolving before the user might navigate away or click again.
Why this is correct
Asynchronous calls require proper handling of promises to update scope.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the misconception that server-side errors are the only cause of missing success messages, but the trap here is that asynchronous client-side handling (promise resolution and digest cycles) can silently fail to update the UI even when the server executes correctly.
Detailed technical explanation
How to think about this question
In ServiceNow, $scope.server.get() returns a promise that resolves when the server response arrives. If the user triggers another action (e.g., navigating away or clicking Submit again) before the promise resolves, the original $scope.data may be overwritten or the callback may not execute, causing the success message to never show. This is a common race condition in AngularJS widgets where asynchronous calls are not properly managed with $q or $timeout to ensure UI updates occur in the correct digest cycle.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
User Interface Development — This question tests User Interface Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The client controller does not handle the asynchronous response properly; the success message depends on the promise resolving before the user might navigate away or click again. — The client controller uses $scope.server.get() to make an asynchronous call to the server script. If the user clicks 'Submit' and then navigates away or clicks again before the promise resolves, the success message (ng-show='data.success') may never display because the $scope.data object is not updated in time. The server script logs no errors because it executes correctly, but the client-side asynchronous handling fails to capture the response, leading to the intermittent issue.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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