JavaScript variable is not defined at onclick button while calling a function

Question

I'm trying to pass a PHP variable into an onclick() in a bootstrap button, here's the code, please note that it's in a PHP echo:

<button id="reportTopicButt" class="btn btn-danger" onclick="reportTopic('.$topicID.')">
<i class="fa fa-flag"></i></button>

$topicID is a PHP variable that I get from a query and it's declared inside a PHP function, that's why that code above is an echo statement.

Here's my reportTopic() JavaScript function:

   function reportTopic(aTopicID) {
        var topicID = aTopicID;

        $.ajax({
            url:"report-topic.php?topicID=" + topicID,  
            type: "GET", 

            success:function(data) {
                var results = data;  
                console.debug(results);

                alert('Thanks for reporting');
        }});
    }

The funny thing is that the Chrome console prints the ID I need out, but it gives me the following error:

Uncaught ReferenceError: CRFYLtWNDD is not defined
    at HTMLButtonElement.onclick

CRFYLtWNDD is my $topicID PHP variable, so at least I know that the onclick() button gets it correctly, but I really can't figure out why it's not defined.

Renzo Calla · Accepted Answer · 2017-10-18 13:42:01Z

4

it is because $topicId is rendered as a variable to solve it set it as a string inside your php

<button id="reportTopicButt" class="btn btn-danger" onclick="reportTopic(\''.$topicID.'\')">
<i class="fa fa-flag"></i></button>

answered Oct 18, 2017 at 13:42

Renzo Calla

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Dimitris Filippou · Accepted Answer · 2017-10-18 13:41:38Z

3

Because you are passing a string to you function you should include it between ' ' if you dont do this javasript thinks you are passing a variable thats why you get the undefined error

Try this

onclick="reportTopic(\''.$topicID.'\')">

answered Oct 18, 2017 at 13:41

Dimitris Filippou

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