Wordpress plugin onclick function not working-CodePudding

Im currently creating my own plugin to window.print a post on my WordPress website. But it seems that i cannot acces the function thru the onclick. If i put the window.print in the button itself it works, but that is not how it has to work for me.

 
// Only do this when a single post is displayed
if ( is_single() ) { 
 
// Message you want to display after the post

$content .= '<button type="Submit" value="Print_PDF" onclick="GetPDF()"> Print PDF </button>';
 
} 
// Return the content
return $content; 
    
    
}```

But whenever i click the button i get an error that says that it does not acces this function:

```  function GetPDF() {
window.print();
}```

It is in the same file.

CodePudding user response：

Try this:

// Only do this when a single post is displayed
if ( is_single() ) { ?>

<script>
function GetPDF(e) {
    e.preventDefault();
    window.print();
}
</script>
 
<?php 
    // Message you want to display after the post

    $content .= '<button type="button" value="Print_PDF" onclick="GetPDF(event)"> Print 
    PDF </button>';
 
    } 
    // Return the content
    return $content;   
    
}

CodePudding user response：

The HTML element's onclick attribute looks for a javascript function, it cannot run a PHP function.

See this question