Hide/Show an element

Hi,
I'd like to hide/show an element as a variable (if ($tt==1){ } ) but I don't know how to do. Could you please help me.
Thank you

Hi philphil,

The quick and dirty approach is with CSS. Add this to a Custom Code action in the form OnLoad event

<?php
$show_me = 'block';
if ( $form->data['some_name'] != 1 ) {
  $show_me = 'none';
}
$jdoc = JFactory::getDocument();
$style = ".show_hide { display: '{$show_me}'; } ";
$jDoc->addStyledeclaration($style);
?>

The add the class show_hide to to the element

For blocks of elements you can do something similar with containers.

Bob

Hi Bob,
Thank you very much for your help but the program is not working ! I have changed "$jdoc->addStyleDeclaration" but it's not enough and i'm not sure of the true words.
(excuse my bad english)
Thanks

Hi philpil,

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

Bob

Hi Bob,
I have made a small form with a Custom Code action in the form OnLoad event with this :

<?php
$form->data['some_name']= 2;
$show_me = 'block';
if ( $form->data['some_name'] != 1 ) { $show_me = 'none';}
$jdoc = JFactory::getDocument();
$style = ".show_hide { display: '{$show_me}'; } ";
$jdoc->addStyleDeclaration($style);
?>

and a container with

Container Class = show_hide
Start Code = <div id='block'>
End Code = </div>

The container is visible (with some_name= 1 or 2) but i'm a beginner and certainly something is missing !
Thank you very much if you have time to help me.

Hi,
there is an easy solution. To do this, two containers must be use with the selection "Custom". Write in the first:

<?php
$display = 'none';
if ( $form->data['some_variable'] == 'no' ) {$display = 'block';}
echo "<fieldset style='display:{$display};' >
  <legend>Some Title</legend> ";
?>

and in the second :

</fieldset>

I have found this solution in the forum.
Best regards