Apache Struts 2 Documentation > Home > Guides > Tag Developers Guide > Struts Tags > Tag Reference > Generic Tag Reference > push |

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Added by digi9ten, last edited by Don Brown on Jan 06, 2007 (view change)

| Please make sure you have read the Tag Syntax document and understand how tag attribute syntax works.

# Description

Push value on stack for simplified usage.

# 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
value | true |  | true | String | Value to push on stack

# Examples

    <s:push value="user">
        <s:propery value="firstName" />
        <s:propery value="lastName" />
    </s:push>

    Pushed user into the stack, and hence property tag could access user's properties
    (firstName, lastName etc) since user is not at the top of the stack

    <s:push value="myObject">                              ----- (1)
         <s:bean name="jp.SomeBean" id="myBean"/>        ----- (2)
            <s:param name="myParam" value="top"/>        ----- (3)
         </s:bean>
     </s:push>

    when in (1), myObject is at the top of the stack
    when in (2), jp.SomeBean is in the top of stack, also in stack's context with key myBean
    when in (3), top will get the jp.SomeBean instance

    <s:push value="myObject">                                       ---(A)
       <s:bean name="jp.SomeBean" id="myBean"/>                   ---(B)
          <s:param name="myParam" value="top.mySomeOtherValue"/>  ---(C)
       </s:bean>
    </s:push>

    when in (A), myObject is at the top of the stack
    when in (B), jp.SomeBean is at the top of the stack, also in context with key myBean
    when in (C), top refers to jp.SomeBean instance. so top.mySomeOtherValue would invoke SomeBean's mySomeOtherValue() method

    <s:push value="myObject">                                 ---- (i)
       <s:bean name="jp.SomeBean" id="myBean"/>             ---- (ii)
          <s:param name="myParam" value="[1].top"/>         -----(iii)
       </s:bean>
    </s:push>

    when in (i), myObject is at the top of the stack
    when in (ii), jp.SomeBean is at the top of the stack, followed by myObject
    when in (iii), [1].top will returned top of the cut of stack starting from myObject, namely myObject itself