TinyButStrong：TBS对象访问一个全局变量而不访问另一个

I have a base template that then builds sub-templates.

Template side:

    <header>
        {onload;file={var.flag;if [val]=1;then 'nav.tpl';else ''}}
    </header>
    <main>
        {onload;file={var.templatePath}}
    </main>

So the main tag is populated with the sub-template, but the header is not. It is saying, TinyButStrong Error in field {var.flag...}: the key 'flag' does not exist or is not set in VarRef. (VarRef seems refers to $GLOBALS) This message can be cancelled using parameter 'noerr'., but in fact it does exist in the VarRef array along with templatePath.

Php Side:

global $templatePath, $flag;
$this->tbs->LoadTemplate($pageTemplateFile);
if(true){$flag = 0;}
$this->tbs->Show();

By default in TBS, the [var] fields refer to $GLOBALS (which is the same as variables locally declared with « global »).

Nevertheless in your snippet, the value of $flag is NULL when the template is loaded because it is declared with « global » but no value is assigned to it yet ($flag = 0 is assigned after the template is loaded). So for PHP : is_set($flag) will return false when [onload] fields are processed.

So you have to use [onshow] fields instead of [onload], or simply set $flag before the loading. Like this :

global $templatePath, $flag;
if(true){$flag = 0;}
$this->tbs->LoadTemplate($pageTemplateFile);
$this->tbs->Show();