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In ServiceNow, client scripts are scripts that run on the client side (in the user's browser) to perform actions or validations. These scripts are written in JavaScript and are used to enhance the user interface and user experience. Here are the main types of client scripts in ServiceNow:
OnLoad:
Purpose: Executes when a form is loaded.
Use Cases: Setting default field values, making fields read-only, or hiding/showing certain fields.
javascript
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// Example OnLoad client script
g_form.setValue('field_name', 'default_value');
OnChange:
Purpose: Executes when a field value changes.
Use Cases: Validating input, updating related fields dynamically.
javascript
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// Example OnChange client script
if (g_form.getValue('field_name') 0) {
alert('Value must be greater than or equal to 0');
g_form.setValue('field_name', '');
}
OnSubmit:
Purpose: Executes when a form is submitted.
Use Cases: Additional validation before submission, custom actions before saving.
javascript
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// Example OnSubmit client script
if (g_form.getValue('required_field') === '') {
alert('Please fill in the required field before submitting.');
return false; // Cancel form submission
}
Catalog Client Script:
Purpose: Executes on catalog item forms.
Use Cases: Customizing behavior on catalog item forms.
javascript
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// Example Catalog Client Script
if (g_form.getValue('quantity') 1) {
alert('Quantity must be at least 1');
g_form.setValue('quantity', 1);
}
UI Policy:
Purpose: Controls the visibility and read-only state of form fields.
Use Cases: Enforcing field visibility and read-only conditions based on certain criteria.
javascript
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// Example UI Policy script
if (current.u_category == 'Software') {
g_form.setReadOnly('u_license_key', false);
} else {
g_form.setReadOnly('u_license_key', true);
}
In ServiceNow, there are several types of client scripts that you can use to customize the behavior of forms and enhance the user experience. The main types of client scripts in ServiceNow are:
OnLoad Client Scripts:
Purpose: Executed when a form is loaded.
Use Cases: Setting default field values, making fields read-only, or hiding/showing certain fields.
OnChange Client Scripts:
Purpose: Executed when a field value changes.
Use Cases: Validating input, updating related fields dynamically.
OnSubmit Client Scripts:
Purpose: Executed when a form is submitted.
Use Cases: Additional validation before submission, custom actions before saving.
OnCellEdit Client Scripts:
Purpose: Executed when a cell in a list is edited.
Use Cases: Customizing behavior when editing list fields.
Catalog Client Scripts:
Purpose: Executed on catalog item forms.
Use Cases: Customizing behavior on catalog item forms.
Catalog UI Policies:
Purpose: Controls the visibility and read-only state of form fields on catalog item forms.
Use Cases: Enforcing field visibility and read-only conditions based on certain criteria.
UI Policies:
Purpose: Controls the visibility and read-only state of form fields.
Use Cases: Enforcing field visibility and read-only conditions based on certain criteria.
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