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Friday, 29 June 2012

ATG --> quick reference to commonly used DSP Tags

In this blog, I would like to give a quick reference to the most commonly used DSP Tags.Note that in this DSP tag details :
  • bean refers to a Nucleus path, component name, and property name
  • param refers to a Page parameter
  • value refers to a Static-value
  • var refers to a EL variable
  • id refers to a scripting variable
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1.dsp:importbean


   example: <dsp:importbean bean="/atg/dynamo/droplet/Switch"/>

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2.dsp:page

   usage: It encloses a JSP. The dsp:page invokes the JSP handler, which calls the servlet pipeline and generates HTTPServletRequest.

  example:   <dsp:page> ..... </dsp:page>

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3.dsp:include


   usage: Embeds a page fragment in a JSP.

   example:  <dsp:include src="/myPage/ResultPage.jsp" flush="true">  
                    <dsp:include page="../common/i18nInclude.jsp">

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4.dsp:setvalue

   usage: Lets you set a bean property or page parameter with a value copied from another bean property, page parameter, or constant

   syntax: <dsp:setvalue target-spec [source-spec] />
            target-spec  --> bean  or  param
            source-spec  --> beanvalue="property-spec"  or   paramvalue="param-name"   or   value="static-value"

   example: <dsp:setvalue param="currLocale" beanvalue="/atg/userprofiling/Profile.locale" />
                   <dsp:setvalue bean="Student.name" paramvalue="currentName"/>

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5.dsp:getvalueof


   usage: Creates an EL variable or a scripting variable

   syntax: <dsp:getvalueof  source-value  var-spec [data-type] />
             source-value  --> bean  or  param  or value
             var-spec --> var="EL variable"   or  id="scripting variable"
             data-type  --> vartype="java.lang..."  or  idtype="java.lang..."

   example: <dsp:getvalueof id="locale" bean="/atg/userprofiling/Profile.locale">
                          .....<%=locale%>...
                  </dsp:getvalueof>
  <dsp:getvalueof var="backgroundcolor" bean="Profile.preferredColor" vartype="java.lang.String">
                             <body bgcolor="${backgroundcolor}" >
  </dsp:getvalueof>

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6.dsp:droplet


   usage: Lets you invoke a servlet bean from a JSP page

   syntax: <dsp:droplet [var-spec] name="servlet-bean" >
  ...
</dsp:droplet>
var-spec  --> var="EL variable"   or  id="scripting variable"
var --> Names an EL-accessible Map variable, which holds a servlet bean’s parameters and parameter values.

   example: <dsp:droplet var="fe" name="/atg/dynamo/droplet/ForEach">

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7.dsp:param


   usage: Stores a value in a parameter to a servlet bean (mainly droplets) or as a page parameter

   syntax: <dsp:param name="param-name" param-value />
                  param-value -->  bean   or    param  or    value

  example: <dsp:droplet name="/atg/dynamo/droplet/IsNull">
                    <dsp:param name="value" param="locale"/>
<dsp:include src="/myPage/ResultPage.jsp" flush="true">
                      <dsp:param name="results" bean="ProductCatalogQueryFormHandler.results"/>

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8.dsp:oparam


   usage: Specifies content to be rendered by an enclosing dsp:droplet tag. dsp:oparam (open parameter) takes the value supplied to it in a JSP and passes it to the current dsp:droplet tag. Each servlet bean maintains a set of open parameters which the servlet bean can set, service, and deliver as output to a JSP.

   syntax: <dsp:oparam name="param-name">
                    ...
</dsp:oparam>

   example: <dsp:droplet name="Switch">
                     <dsp:param name="value" param="person.hasCar"/>
    <dsp:oparam name="false">
 No vehicle
           </dsp:oparam>

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9.dsp:form


   usage: Lets you set up a form that accepts user inputs, which are saved as component properties.

   syntax:  <dsp:form  method="{get|post}" [action="jsp-page"]  [synchronized="component-spec"]
                        [formid="id"]  [requiresSessionConfirmation="{true|false}"]/>

    synchronized --> Specifies the Nucleus path and name of a component that is blocked from accepting other form submissions until this form is submitted.
    formid --> Assigns a unique identifier to the form. Forms require unique identifiers when a page specifies multiple forms and conditionally displays only one of them.
    requiresSessionConfirmation  --> If set to true, prevents cross-site attacks

   example: <dsp:form method="post" action="servbeantest.jsp" synchronized="/samples/Student"/>

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10.dsp:input


   usage: All dsp:input tags must be embedded between <dsp:form>..</dsp:form> tags, which are either in the same JSP or a parent JSP.

   syntax:  <dsp:input [type="input-control"] [name="input-name"]   bean="property-spec" ["source-spec"]
                       [checked="{true|false}"]  [default="value"]  [priority=integer-value]/>

    type --> text  or checkbox  or  radio  or hidden  or submit or  image(defines a submit control that uses the image)
    name --> For all input types other than radio and checkbox, the assigned name must be unique.
   bean --> The bean attribute for a submit control can also specify a form handler operation such as cancel or update
   source-spec --> Specifies to prepopulate the input field from  beanvalue  or paramvalue  or value . If source-value is omitted, the input field contains the target property’s current value.
   checked  --> If set to true, displays a checkbox or radio button as selected.
   default --> Specifies a default value to save to the component property if the user neglects to supply a value
   priority --> Specifies the priority of this input field during form processing

   example:
    <dsp:input bean="StudentFormHandler.updateSuccessURL" type="hidden" value="index.jsp"/>
    <dsp:input tabindex="2" type="text" id="searchinput" name="searchinput" bean="SearchValidateFormHandler.searchString"  maxlength="1000" priority="10"  value="<%=defaultKeyword%>"  onfocus="clearTextArea(searchbutton,searchinput)" />
    <dsp:input bean="SearchValidateFormHandler.validate" name="validate" id="validate" type="hidden" value="DAS" style="display:none" priority="-10"/>
    <dsp:input type="submit" bean="StudentFormHandler.create" value="Register"/>
    <dsp:input type="radio" name="sex" id="male" bean="SearchValidateFormHandler.gender" />
    <dsp:input type="radio" name="sex" id="female" bean="SearchValidateFormHandler.gender" />

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11.dsp:valueof


   usage: renders a value in a bean property or page parameter

   syntax: <dsp:valueof value-source>
 [default-value]
</dsp:valueof>
                 value-source  --> bean  or  param  or value

   example:  <dsp:valueof param="currentName">Happy User</dsp:valueof>
         <h4><dsp:valueof bean="SearchDisplayDroplet.departmentLabel"/></h4>
 <input type="hidden" name="firstFacetLabel" value="<dsp:valueof param="firstFacetLabel"/>" id="firstFacetLabel"/>

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12.dsp:textarea


   usage: lets you create an extended text box that for multi-line input

   example: <dsp:textarea bean="Student.disciplinaryAction" default="None"/>

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13.dsp:a


   usage: It can also update a servlet bean property value and pass a page parameter to the destination page.

  syntax:  <dsp:a link-destination> link-text [param-list]   [property-settings]  </dsp:a>
 
link-destination  --> href ( resolves absolute paths using the Web server doc root as a starting point) or  page ( resolves absolute paths using the Web application root as a starting point)
        param-list  --> One or more embedded dsp:param
        property-settings  --> specifies settings for one or more bean properties.

   example: <dsp:a href="homepage.jsp">Go to your home page
  <dsp:param name="city" beanvalue="Profile.homeAddress.city"/>
  </dsp:a>

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14.dsp:select and  dsp:option


   example: <dsp:select bean="Student.Summerhobbies" multiple="true" nodefault="true" priority="10">
                     <dsp:option value="hiking">hiking</dsp:option>
                    <dsp:option value="biking">biking</dsp:option>
     <dsp:option value="swimming">swimming</dsp:option>
 </dsp:select>

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8 comments:

  1. Hi ,
    You are doing a great job by posting such beautiful information. Being a newbie in ATG, these topics help me very much. You are doing a wonderful job. keep posting. God Bless you.

    ReplyDelete
  2. Really nice article. very helpful.
    Droplets, DSP tags, frorm handlers & ATG... :D

    ReplyDelete
  3. Really good Ariticle...
    Super up Admin.....

    ReplyDelete
  4. Thank you all.... cheers.... :-)

    ReplyDelete
  5. admin we need more notes about ATG with real time example can you...?

    ReplyDelete
  6. we need more information with real time example program admin...

    ReplyDelete