HTML <if>?

[MTGDarkness]

How do you use this? I can't find any guides, or indeed anything about the <if> tag anywhere outside the actual code of forum software itself! I'm trying to work an if clause into a template modification (iTrader based), and I just need to know the correct usage of <if>... Does it have to be

<if condition=>(code)</if>

? Or could it be

<if $var=$var2>(code)</if>

?

And what about else options?

[TriggerHappy123]

I'm not sure if html has if's but javascript does. this may help, you can integrate it with html.

[Kirk Y]

The syntax is:

<if condition="CONDITION">Displayed when CONDITION is TRUE</if>

This is a vBulletin-only HTML "tag" -- it is parsed out by PHP when the template is evaluated. You can't just throw it in an HTML document.

[MTGDarkness]

That's what I thought. But all the time I see

<if condition=$var>(stuff to do)</if>

, and that makes no sense to me...

[Kirk Y]

In PHP, $var is the same as isset($var) which returns TRUE if $var exists and FALSE if it does not.

So--

<if condition="$var">Stuff to do</if>

Will display "Stuff to do" when $var exists.

[MTGDarkness]

Oh, I see. Thanks. I'm going to try out my template modification and see if it works...

[sparklywater]

see this tutorial for vB conditionals: http://www.vbulletin.com/docs/html/

type in 'template conditionals' in the search box and click on first link.

[Adrian Schneider]

The condition between the two quotes is parsed as a boolean expression.

Originally Posted by PHP Manual

When converting to boolean, the following values are considered FALSE:

• the boolean FALSE itself
• the integer 0 (zero)
• the float 0.0 (zero)
• the empty string, and the string "0"
• an array with zero elements
• an object with zero member variables (PHP 4 only)
• the special type NULL (including unset variables)
• SimpleXML objects created from empty tags

Every other value is considered TRUE (including any resource).

Usually in templates, you'd check the value of options or user settings. Unless you really understand the above, it's best to use comparisons to avoid mix ups.

<if condition="$variable == 'Yes'"> 
<if condition="$variable > 10">
<if condition="$vbulletin->options['something_enabled']">

etc.

[MTGDarkness]

Thanks for the help guys. Modification works great.