not defined at HTMLInputElement.onkeyup

This is my code:

<h2></h2>
<input type="text" onkeyup="titleb(this.value)">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<script>
    (function($){
        function titleb( title ) {
            $('h2').html(title);
        }
    })(jQuery)
</script>

It supposed to take the input text and add it to the h2... but what I'm getting instead is:

Uncaught ReferenceError: titleb is not defined
    at HTMLInputElement.onkeyup

Your function is nested

This is how to solve this:

<h2></h2>
<input type="text" onkeyup="titleb(this.value)">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
<script>
    let titleb
    (function($){
        titleb = (title) => {
            $('h2').html(title)
        }
    })(jQuery)
</script>

For people who don't understand

(val) => {} is same as function (val) {}

Getting function not defined on keyup of input element, HTML <input type="text" id="search-attorneys" placeholder="Search for names.." title="Type in a name">. Javascript (index):11 Uncaught ReferenceError: sayHello is not defined at HTMLInputElement.onkeyup ((index):11) 2(index):12 Uncaught ReferenceError: sayHello is not defined at HTMLInputElement.onkeyup ((index):12) ContentLoader.js:28 failed to get content script 👍


You can manage to have a namespace like:

onkeyup="myapp.titleb(this.value)"

and in your script use this:

<script>
    var myapp = (function($){
        return function titleb( title ) { // add a return
            $('h2').html(title);
        }
    })(jQuery)
</script>

Javascript onkeyup function - function is not defined, I have made a simple fiddle where I want to call a function on keyup event, but I get function not defined. What is wrong with this code: Html: value; // ReferenceError: value is not defined var value; value; // No more errors here. Becuse value is defined before its usage. In the first line, the variable value is not defined at this time.


You can simply have a function like here.

function titleb(title)
{

  $('h2').html(title);
}
<script src="https://code.jquery.com/jquery-3.1.0.js"></script><h2></h2>
<input type="text" onkeyup="titleb(this.value)">

onkeyup Event, Definition and Usage. The onkeyup event occurs when the user releases a key (​on the keyboard). Tip: The order of events Try it Yourself ». Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions. Uncaught ReferenceError: createSlug is not defined at HTMLInputElement.onkeyup (admin-categori-form.html:111)


The function called in the html must be in the global scope like this:

<script>
  function titleb( title ) {
    $('h2').html(title);
  }
</script>

Here is the working fiddle.

http://jsfiddle.net/e7z15tqf/

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GlobalEventHandlers.onkeyup, The keyup event fires when the user releases a key that was previously pressed. Syntax. target.onkeyup = functionRef;. Value. functionRef is a 


onkeyup event, For a complete list of events, see the page for Events in JavaScript. Basic information: Bubbles, Yes. Cancelable, No. Event object, KeyboardEvent. Actions​