![]() To avoid having two or more client scripts run concurrently and then conflict, you can add an order for the scripts to run in.Īdding an order to the client script creates a processing sequence, ordered from lowest to highest number. G_form.showFieldMsg('impact', getMessage('Low impact now allowed with High priority'), 'error') Set client script orderĬontrol the order of execution for your client scripts using the Order field. This example demonstrates the incorrect way to call setValue: This extra round trip to the server can impact performance. If you set the value without the displayValue, the instance does a synchronous call to retrieve the display value for the record you specified. When using setValue() on a reference field, be sure to include the reference field display value as the 3rd parameter. When using setValue() on a reference field, include the displayValue parameter to avoid additional server calls. Whether or not the current record has attachmentsĪ display business rule sends this information to the client using the following script:ĬiCheck.prototype = Object.extendsObject(AbstractAjaxProcessor, ) Use the setValue() displayValue parameter for reference fields.In those cases, use an asynchronous GlideAjax call.įor example, assume you open an incident and need to pass this information to the client: The business rule cannot be triggered dynamically. However, you can only load data this way when the form is loaded. This is a very efficient means of sending information from the server to the client. Theg_scratchpad is sent to the client when the form is requested, making it available to all client-side scripting methods. If you know what information the client needs from the server before the form is loaded, a display business rule can create g_scratchpad properties to hold this information. While this solution may be faster to configure, it is slower to execute. A typical solution to this situation is to place the field on the form and then always hide it with a client script or UI policy. ![]() The g_scratchpad object passes information from the server to the client, such as when the client requires information not available on the form.įor example, if you have a client script that needs to access the field u_retrieve, and the field is not on the form, the data is not available to the client script. ![]() Both methods retrieve all fields in the requested GlideRecord when most cases only require one field.Įxample: Retrieve server data using g_scratchpad However, these methods are no longer recommended due to their performance impact. GlideRecord and g_form.getReference() are also available for retrieving server information. The primary difference between these methods is that g_scratchpad is sent once when a form is loaded (information is pushed from the server to the client), whereas GlideAjax is dynamically triggered when the client requests information from the server. The top ways to get information from the server are g_scratchpad and asynchronous GlideAjax lookup. Use client data as much as possible to eliminate the need for time-consuming server lookups.Ĭlient scripting uses either data available on the client or data retrieved from the server. Use the following methods to restrict list editing when using client scripts: With the exception of onCellEdit client scripts, UI policies and client scripts apply to forms only. If you create UI policies or client scripts for fields on a form, you must use another method to ensure that data in those fields is similarly controlled in a list. Create a separate onCellEdit client script.Create appropriate business rules or access controls for list editing.If you create client scripts to control field values on a form, you must use another method to control these field values in a list. Making record updates prior to form load can produce unexpected results that bypass client-side processing. Proper client-side processing depends on the form loading first. Well-designed client scripts can reduce the amount of time it takes users to complete a form. See the original article on the ServiceNow doc site: ServiceNow: Client-side scripting design and processing. This article is based on the ServiceNow documentation article.
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