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# push

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.

## Attributes

#### Dynamic Attributes Allowed: false
#### Name | #### Required | #### Default | #### Evaluated | #### Type | #### Description
--- | --- | --- | --- | --- | ---
value | true |  | false | 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 now at the top of the stack.

    <s:push value="myObject">                            ----- (1)
         <s:bean name="jp.SomeBean" var="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" var="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" var="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