How to check if smarty isset post

Question

How can i check if a post is set? isset($_POST['formname'])

I can't seem to find out how to do it in smarty?

{if isset($_POST['login'])}
Login is set!
{/if}

Answer 1

You don't have to assign any data to Smarty in this case because request variables are simple visible in Smarty. So you can simple do that in your tpl file:

{if isset($smarty.post.username)}
  Login is set!
{/if}

From comment I understand you want to do something else. Look at this code in template file:

{if isset($smarty.post.username)}
  Username is set!

{if $smarty.post.username eq ''}
  Empty username
{/if}  
{/if}



<form name="form" method="post"> 
<input type="text" class="form-control" style="width:500px;" name="username" placeholder="Username or Email"><br>
 <input type="password" class="form-control" style="width:500px;" name="password" placeholder="Password"><br> 
<input type="submit" class="btn btn-info" style="width:500px;" name="login" value="Sign In"> </form>

When you first open site (and don't send form) no message is displayed because form has not been set and there is no $_POST data sent. But when you send form (without filling in anything) you will have message "Login is set" because form has been set and $_POST data are set although value of $_POST['login'] is empty string.

So in inner if you check if it's empty or not.

You can as alternative also use

{if isset($smarty.post.username) and ($smarty.post.username eq '')}
  Username is set but it's empty!
{/if}