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**Brennan** · 12-07-23, 01:49 PM

What is your use case?

The closest thing would be a cookie or a custom page field that you render globally in the head tag so its available everywhere.

**alphabet** · 12-08-23, 05:50 AM

I'm just wondering if you mean a global variable versus a system variable as they have different scope and availability?

Brennan - Can he create system variables from global headers, htaccess or miva_config?

**TipPro** · 12-08-23, 06:31 AM

Thanks the responses. I was looking for a way to remove a repetitive IF statement. Rendering a global variable in the head tag doesn't work because I need to call this before the global header is called.

Code:

<mvt:if expr="s.http_host EQ 'www.domain.com'">
     <mvt:assign name="l.useURL" value="'https://www.otherDomain.com/miva/'" />
<mvt:else>
     <mvt:assign name="l.useURL" value="'https://dev.otherDomain.com/miva/'" />
</mvt:if>

<mvt:call ACTION="l.useURL $ 'template/' $ l.settings:page:code $ '/' $ g.objectId" METHOD="'GET'">
     <mvt:assign name="g.jsonData" value="s.callvalue" />
</mvt:call>

**alphabet** · 12-08-23, 12:58 PM

Code:

<mvt:assign name="g.http_host" value="s.http_host" />
<mvt:if expr="g.http_host EQ 'www.domain.com'">
     <mvt:assign name="l.useURL" value="'https://www.otherDomain.com/miva/'" />
<mvt:else>
    <mvt:assign name="l.useURL" value="'https://dev.otherDomain.com/miva/'" />
</mvt:if>

<mvt:call ACTION="l.useURL $ 'template/' $ l.settings:page:code $ '/' $ g.objectId" METHOD="'GET'">
<mvt:assign name="g.jsonData" value="g.jsonData $ s.callvalue" />
</mvt:call>

I'm guessing that you have to use global scope in the IF statement. Also the s.callvalue streams so you have to concatenate it. Then use miva_json_decode() .

**Bruce - PhosphorMedia** · 12-08-23, 05:50 PM

and use the HTML Profile section for stuff like this, just make sure if AFTER the doctype.
the Head template, <head> gets appended with a bunch of stuff before the Head Template is rendered.

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How to create a custom system variable

How to create a custom system variable

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