The correct answer is that the short_description field is set to 'Category changed to Network'. This happens because the onChange client script evaluates the newValue of the 'category' field against a conditional field value: the script first checks that newValue is not empty, then verifies it strictly equals 'Network'. Since both conditions are true when the user selects 'Network', the script executes g_form.setValue to update the short_description. On the ServiceNow Certified Application Developer CAD exam, this question tests your understanding of client-side scripting logic, specifically how onChange scripts trigger based on field value changes and the importance of the newValue parameter. A common trap is forgetting that the empty check (newValue !== '') must pass before the equality condition runs, or confusing newValue with the oldValue parameter. Memory tip: think of "newValue first, then equals" — always validate that the field changed before checking what it changed to.
SNOW-CAD User Interface Development Practice Question
This SNOW-CAD practice question tests your understanding of user interface development. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
Client script on a form:
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue == '') {
return;
}
g_form.setValue('short_description', 'Category changed to ' + newValue);
}
This client script is attached to the 'category' field on the incident form. When the user changes the category to 'Network', what happens to the short_description field?
Refer to the exhibit.
Client script on a form:
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue == '') {
return;
}
g_form.setValue('short_description', 'Category changed to ' + newValue);
}
A
Nothing happens because newValue equals 'Network' which passes the empty check.
Why wrong: newValue is not empty, so the condition fails and the setValue runs.
B
The short_description is set to 'Category changed to Network'.
The setValue method updates the field.
C
An error occurs because setValue cannot be called with a string.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The short_description is set to 'Category changed to Network'.
Option B is correct because the client script checks if the newValue of the 'category' field is not empty and equals 'Network'. When the user changes the category to 'Network', newValue is 'Network', which passes the empty check (newValue !== ''), and then the condition newValue === 'Network' is true. The script then executes g_form.setValue('short_description', 'Category changed to Network'), which sets the short_description field to that string.
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.
✗
Nothing happens because newValue equals 'Network' which passes the empty check.
Why it's wrong here
newValue is not empty, so the condition fails and the setValue runs.
✓
The short_description is set to 'Category changed to Network'.
Why this is correct
The setValue method updates the field.
Related concept
Read the scenario before looking for a memorised answer.
✗
An error occurs because setValue cannot be called with a string.
Why it's wrong here
setValue accepts a string.
✗
The short_description is cleared.
Why it's wrong here
The script sets a value, not clears.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may misinterpret the empty check as a guard that prevents any action when newValue is non-empty, but the script only skips if newValue is empty, so when newValue is 'Network', it proceeds to the equality check and executes the setValue call.
Detailed technical explanation
How to think about this question
In ServiceNow client scripts, g_form.setValue() is a GlideForm API method that updates the specified field's value on the client side, triggering any associated client-side logic. The empty check (newValue !== '') is a common pattern to avoid executing the script when the field is cleared or initially empty. In real-world scenarios, this pattern is used to enforce business rules, such as setting default descriptions or triggering dependent field updates, but developers must ensure the condition logic matches the expected field values exactly.
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 short_description is set to 'Category changed to Network'. — Option B is correct because the client script checks if the newValue of the 'category' field is not empty and equals 'Network'. When the user changes the category to 'Network', newValue is 'Network', which passes the empty check (newValue !== ''), and then the condition newValue === 'Network' is true. The script then executes g_form.setValue('short_description', 'Category changed to Network'), which sets the short_description field to that string.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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