@Subhashini C
There are usually 4 types of client scripts in ServiceNow.
1.onLoad Client Scripts: These scripts run when a form loads.
function onLoad() {
// Get the GlideForm object
var gf = g_form;
// Make the 'comments' field read-only
gf.setReadOnly('comments', true);
// Make the 'short_description' field read-only ONLY on new records
if (g_form.isNewRecord()) {
gf.setReadOnly('short_description', true);
}
}
2. onChange Client Scripts: These scripts run when a specific field's value changes.
function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return; // Don't run on initial load or if the field is cleared
}
if (newValue == 'problem') {
g_form.setVisible('problem_details', true); // Show the 'problem_details' field
} else {
g_form.setVisible('problem_details', false); // Hide the 'problem_details' field
}
}
3. onSubmit Client Scripts: These scripts run when a form is submitted. They are crucial for data validation.
function onSubmit() {
if (g_form.getValue('short_description') == '') {
alert('Short description is required!');
return false; // Prevent submission
}
}
4. onCellEdit Client Scripts: These scripts run when a cell in a list is edited (inline editing).
function onCellEdit(sys_id, table, old_value, new_value, is_loading) {
if (is_loading) {
return;
}
if (isNaN(new_value)) {
alert('Please enter a number.');
g_form.setCellDisplayValue(table, sys_id, 'quantity', old_value); // Revert to the old value
return false; // Prevent the change
}
}
Hope this helps.
