Showing a field when "Ja" is selected

Bob, in v3 I have some forms with JS in it
Basically it does the following

When EG)select_2 == Ja, a field will appear in the form.
On "Nee" the field does not show

So...how to set this up in V4??

This the old code

<?
$doc =& JFactory::getDocument();
$script = "window.addEvent('domready', function() {
  $('select_2').addEvent('change', function(event) {
    var e = new Event(event);
    if (e.target.value == 'Ja') {
      $('Voornaam').getParent().getParent().setStyle('display', 'block');
    } else {
      $('Voornaam').getParent().getParent().setStyle('display', 'none');
    }
  });
});";
$doc->addScriptDeclaration($script);
?>

Hi SPABO,

Drag a Load JS action itno the OnLoad event, move it up before the Show HTML action and add the script there:

window.addEvent('domready', function() {
  $('select_2').addEvent('change', function(event) {
    var e = new Event(event);
    if (e.target.value == 'Ja') {
      $('Voornaam').getParent().getParent().setStyle('display', 'block');
    } else {
      $('Voornaam').getParent().getParent().setStyle('display', 'none');
    }
  });
});

Check that the input ids match up.

Bob

I did Bob...but than website does not load completely as well
I have this in now (with php-tags)

<? 
window.addEvent('domready', function() {
      $('intro2).addEvent('change', function(event) {
      var e = new Event(event);
      if (e.target.value == 'Ja') {
       $('Intro').getParent().getParent().setStyle('display', 'block');
        } else {
        $('Intro').getParent().getParent().setStyle('display', 'none');
        }
      });
    });
?>

Here the code of the Field, but I recaal "something had to be added?

<div class="ccms_form_element cfdiv_text" id="intro_container_div"><label for="Intro">Naam intr</label><input id="Intro" maxlength="150" size="30" class="" title="" type="text" value="" name="Intro" />
<div class="clear"></div><div id="error-message-Intro"></div></div>

Hi SPABO,

This is JavaScript and doesn't need the 'php' tags. They may be what is breaking your page.

Bob

I tried it without the tags as weel, same result I'm afraid

Hi SPABO,

Please post a link to the form so I can take a quick look.

Bob

Bob, Site is not on-line, so I attach the form as such
Hope this will do?

Hi SPABO,

This line is missing a ' after intro2:

$('intro2).addEvent('change', function(event) {

When that's fixed selecting Nee hides the whole form which probably isn't' what you want.

Bob

I have added the "'" now , website behaves now normal.

Indeed, it's not what I wish

If "Ja" is selected, Field Name "Intro" should appear, if "Nee" has been selected, this field shoold still be hidden

Hi SPABO,

Then these lines are wrong

$('Intro').getParent().getParent().setStyle('display', 'block');

maybe just one getParent, or better check the id for the Intro code block and use that.

Bob

Hi Bob
A combination...

On the form code ( custommode) this is the field (added class display,none)

<div class="ccms_form_element cfdiv_text" style="display: none" id="intro_container_div">

and using your code

$('Intro').getParent().setStyle('display', 'block');

This was the tric

By the way, the select is set standard on "Nee" , otherwise, it disappears only when Nee is selected