Check/uncheck all boxes with JavaScript and DynaValidatorForm pro perty

[Heligon Sandra <sa...@thomson.net>]

	I have a JSP page where I have two buttons check all (to check all
checkboxes) and uncheck all.
	I know that these features can be implemented with simple JavaScript
but it is not easy to associate
            the Javascript with Struts components like DynaValidatorForm.

	My JSP page is the following:

	<logic:iterate name="MyDynaValidatorForm" id="employees"
property="employees" 					type="com.Employee"
offset="offset" length="length">
		<tr>
		   <td bgcolor="#EBEBEB" width="10%">
      			<input type="checkbox" name="selected"> 
		    </td>
		</tr>
	</logic:iterate>

	<table width="100%" border="0" cellpadding="0" cellspacing="0"
bgcolor="#ffffff">
	  <tr>
	    <td align="right" valign="top" width="10%"> 
	      <html:button property="userAction"
onclick="checkAll(this.MyDynaValidatorForm.selected)" >
		<bean:message key="button.select.all"/></html:button>&nbsp
	      <html:button property="userAction"
onclick="uncheckAll(this.MyDynaValidatorForm.selected)" >
		<bean:message key="button.unselect.all"/></html:button> 
	    </td>
	  <tr>
	</table>

	<script language="JavaScript">
	function checkAll(field)
	{
		for (i = 0; i < field.length; i++)
		field[i].checked = true ;
	}

	function uncheckAll(field)
	{
		for (i = 0; i < field.length; i++)
		field[i].checked = false ;
	}	
	</script>

	In the Struts-config.xml file I defined the following form:
	<form-bean name="MyDynaValidatorForm" dynamic="true"
type="org.apache.struts.validator.DynaValidatorForm">
  		<form-property name="userAction" type="java.lang.String" />
  		<form-property name="selected" type="java.lang.Boolean[]" />
	</form-beans>

	I don't understand the aim of the attribute property in the
<html:button> tag.
	This implementation doesn't work if someone has already done a
similar think,
	thanks a lot for your help.

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