 | Please make sure you have read the Tag Syntax document and understand how tag attribute syntax works. |
Description
The set tag assigns a value to a variable in a specified scope. It is useful when you wish to assign a variable to a complex expression and then simply reference that variable each time rather than the complex expression. This is useful in both cases: when the complex expression takes time (performance improvement) or is hard to read (code readability improvement).
The scopes available are as follows :-
- application - the value will be set in application scope according to servlet spec. using the name as its key
- session - the value will be set in session scope according to servlet spec. using the name as key
- request - the value will be set in request scope according to servlet spec. using the name as key
- page - the value will be set in request scope according to servlet sepc. using the name as key
- action - the value will be set in the request scope and Struts' action context using the name as key
NOTE:
If no scope is specified, it will default to action scope.
Parameters
Name |
Required |
Default |
Evaluated |
Type |
Description |
|---|---|---|---|---|---|
| id | false | true | String | id for referencing element. For UI and form tags it will be used as HTML id attribute | |
| name | true | true | String | The name of the new variable that is assigned the value of value | |
| scope | false | action | true | String | The scope in which to assign the variable. Can be application, session, request, page, or action. |
| value | false | true | String | The value that is assigned to the variable named name |
Examples
<s:set name="personName" value="person.name"/> Hello, <s:property value="#personName"/>. How are you?