Wordpress plugin onclick function not working

Question

I'm currently creating my own plugin to window.print() a post on my WordPress website. But it seems that I cannot access 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.

function wpb_follow_us($content) {
  // 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 access this function:

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

It is in the same file.

Why don't you put window.print() inside the onclick like onclick="window.print();" itself? Also, don't wrap the GetPDF() in jquery document ready function. — Vinay Jain, Sep 06 '22 at 10:05
I meant to ask if it's a Javascript function or a PHP function. — Vinay Jain, Sep 06 '22 at 10:09
And it's not wrapped inside the jQuery's $( document ).ready() function right? — Vinay Jain, Sep 06 '22 at 10:10
As per your code GetPDF() is a PHP function here and not the JS function. (Contrary to what you said). You can't call PHP functions from onclick — Vinay Jain, Sep 06 '22 at 10:15
i cant ben stephens. since some people downvotes some relevant questions of mine, SO told me to change my current questions, so i did. but i returned it to the old state — Delano van londen, Dec 13 '22 at 09:14
That's fine, what Ben Stephens wrote you should be aware of and merely a suggestion, they likely don't knew about the general quality of your questions (by the votes, not a judgment call of me personally). Best hint I may give probably is that "not working" is not a good problem description and tends to make questions needlessly broad. You normally have a concrete problem, right? What did not work? What was expected? What happend instead? Questions like these can help to make a question more relevant. More is in the [help]. — hakre, Dec 13 '22 at 09:26
i see what you are saying, and i will take the hint with you for future questions. appreciate it — Delano van londen, Dec 13 '22 at 09:29

score 1 · Accepted Answer · answered Sep 06 '22 at 10:19

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;   
    
}

score 0 · Answer 2 · answered Sep 06 '22 at 10:04

0

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

See this question

answered Sep 06 '22 at 10:04

Good guy

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Wordpress plugin onclick function not working

2 Answers2