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Game Over!
Smarty Rookie
Joined: 01 May 2019
Posts: 10
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 Posted: Wed Dec 18, 2019 9:07 am Post subject: How check if Smarty variable exists in via Java Script |
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Hello guys.
I have an array in my PHP and I pass this variable to Smarty TPL file.
| Code: |
$smarty->assign('outsourceJson', json_encode($outsourceTemp , JSON_UNESCAPED_UNICODE));
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The question is how can I check if this variable exists with JS?
I wrote this code :
| Code: |
var phaseOutsource = JSON.parse('{$outsourceJson}');
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but if the variable doesn't exists it will give me error :
| Code: |
VM174:1 Uncaught SyntaxError: Unexpected end of JSON input
at JSON.parse (<anonymous>)
at
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I even checked if variable exists via this code :
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if( {$outsourceJson} ){
alert("It works");
}
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If $outsourceJson exists , it works fine but if doesn't it will give me error :
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(index):1596 Uncaught SyntaxError: Unexpected token ')'
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and here is source of my HTML :
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if( ){
alert("It works");
}
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as you can see {$outsourceJson} converted to nothing.
So would you please suggest me a way to check if variable exists?
Thanks a bunch |
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bsmither
Smarty Elite
Joined: 20 Dec 2011
Posts: 322
Location: West Coast
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| Posted: Thu Dec 19, 2019 2:44 am Post subject: |
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It will be revealed that {$outsourceJson} exists in a Smarty template - and when Smarty compiles that template, the code {$outsourceJson} gets replaced with the intended value.
The finalized HTML then gets sent out to the visitor's browser where any javascript execution happens.
You can load up the HTML with a Smarty statement like:
| Code: | | {if $outsourceJson}{$outsourceJson}{else}<!-- Sorry, nothing was assigned to the Smarty variable $outsourceJson -->{/if} |
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Game Over!
Smarty Rookie
Joined: 01 May 2019
Posts: 10
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| Posted: Thu Dec 19, 2019 12:21 pm Post subject: |
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| bsmither wrote: | It will be revealed that {$outsourceJson} exists in a Smarty template - and when Smarty compiles that template, the code {$outsourceJson} gets replaced with the intended value.
The finalized HTML then gets sent out to the visitor's browser where any javascript execution happens.
You can load up the HTML with a Smarty statement like:
| Code: |
{if $outsourceJson}
{$outsourceJson}
{else}
<!-- Sorry, nothing was assigned to the Smarty variable $outsourceJson -->
{/if}
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Thank you a billion dear bsmither . You have helped a lot. Best wishes for you  |
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AnrDaemon
Administrator
Joined: 03 Dec 2012
Posts: 1785
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| Posted: Sat Dec 21, 2019 12:32 pm Post subject: |
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Since JSON is a valid JS object, you don't need JSON.parse.
Just
| Code: | | var phaseOutsource = {$outsourceJson}; |
is enough.
And if for some reason the needed variable is not assigned to the template, that's a bug in your code. |
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