dynamicJavascript

[pavanasree vasireddy]

hi,

i am very much confused between the dynamicJavascript and staticJavascript attributes of <html:javascript> tag.

Could some one please explain me what these attributes are meant for?
Why are the set to true by default?

what is the difference if we set the dynamicJavascript to false?


Please help me.

Thanks in advance.

[Sheldon Fernandes]

The validators (both pre-defined and user-defined) perform server-side validation. They may or may not provide client-side validation. If you look at the definitions of the pre-defined validators in validation-rules.xml you can identify if a validator provides client-side javascript validation or not.

STATIC
The javascript methods, present within the <javascript> element or in .js files, form the static content generated by <html:javascript>.

DYNAMIC
1. The <html:javascript> tag generates javascript objects for each pluggable validator, that are used by the static javascript method of that validator. These store the information about the fields and their validation as defined in the validation.xml. For example:

  function required () { 
    this.a0 = new Array(
      "firstName", [B]//field name[/B]
      "First Name is required.", [B]//error message[/B]
      new Function ("varName", "this.mask=/^\\w+$/;this.minlength='5'; return this[varName];")); 
        [B]//javascript function object that has all of the variables associated with this field[/B]
    this.a1 = new Array(
      "lastName", 
      "Last Name is required.", 
       new Function (
           "varName", 
           "this.maxlength='10'; this.mask=/^[a-zA-Z]*$/; return this[varName];"));
    } 

2. In addition it also generates the main javascript validation method which initiates the entire client-side validation.

<script type="text/javascript" language="Javascript1.1"> 
<!-- Begin 
  var bCancel = false; 
 
  function validateRegistrationForm(form) {                                                                   
    if (bCancel) 
      return true; 
    else 
      var formValidationResult;
      formValidationResult = 
      validateRequired(form) && validateMask(form) && validateMinLength(form); 
      return (formValidationResult == 1);
   } 

You can turn each attribute's generation of JavaScript on and off by putting in true or false (they default to true).
Normally, dynamicJavascript is set to true so that is gets generated on the page and staticJavascript is set to false. The static javascript can be put in .js files to take advantage of browser caching.

I hope this makes sense. Have a look at the code generated by the <html:javascript>.

Sheldon Fernandes
[ October 10, 2004: Message edited by: Sheldon Fernandes ]

[pavanasree vasireddy]

thanks for the reply. I got it clarified.


Can u please tell me the class name in which the code to generate dynamicJavascript is written?



Any help is appreciated.

Thanks in advance

[Sheldon Fernandes]

The tag handler class for <html:javascript> is
org.apache.struts.taglib.html.JavascriptValidatorTag

Sheldon Fernandes