SNOW-CAD User Interface Development Practice Question
Which of the following is the best practice for referencing a field value in a client script on a ServiceNow form?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using g_form.getValue('field_name')
The correct answer because g_form.getValue('field_name') is the standard client-side API to retrieve the value of a field on a ServiceNow form. Option A is incorrect because g_l.get() is used for GlideAjax calls, not for direct field access. Option B is incorrect because g_form.getValue() does not take a DOM element as an argument; it expects a field name string. Option D is incorrect because GlideRecord.get() is a server-side method and cannot be used directly in a client script.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using g_l.get('field_name')
Why it's wrong here
g_l is for GlideAjax calls, not for direct field value retrieval.
- ✗
Using g_form.getValue(document.getElementById('field_name'))
Why it's wrong here
g_form.getValue() expects a string field name, not the DOM element.
- ✓
Using g_form.getValue('field_name')
Why this is correct
This is the standard client-side API to get the current value of a field on the form.
- ✗
Using GlideRecord.get() to query the field value
Why it's wrong here
GlideRecord is a server-side API and cannot be used in client scripts without GlideAjax.
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