WHY don't show error - javascript functions unclosed curly brackets ?

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If i missed to give curly brackets for a javascript function in html file don't show error in HTML validator as like C compiler?

What I have tried:

Why below code does not show error in HTML validator [like https://html5.validator.nu]?[^] You can see i have mistakenly missed the enclosing curly bracket of function substitute().As you know in C/CPP programming compiler will say error if any function ending curly braces missed by a programmer.
Like that is any tool/ html validator there to tell about the same about missing curly braces for my example code?

HTML

<!DOCTYPE html>
<html> 
<head>
  <title>JavaScript Example</title> 
  <script type="text/javascript">
    function substitute() {
       var myValue = document.getElementById('myTextBox').value;
        
       if(myValue.length == 0) {
	  alert('Please enter a real value in the text box!');
          return;
       }
       var myTitle = document.getElementById('title');
       myTitle.innerHTML = myValue;
   </script>
</head>
<body>
  <h1 id="title">JavaScript Example</h1>

  <input type="text" id="myTextBox" />
  <input type="submit" value="click me" />
</body>
</html>

Posted 27-Aug-16 18:06pm

Member 11325160

Updated 27-Aug-16 21:48pm

v4

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Peter_in_2780 28-Aug-16 3:22am

An HTML validator doesn't care what is between the <script> ... </script> tags (as long as it's not more HTML tags). You need to look for a javascript validator - something like JSLint - to check your script.

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Afzaal Ahmad Zeeshan · Answer 1 · 2016-08-27T21:48:00

As the name suggests, that is an HTML validator and would only look for the HTML syntax errors and bad practices. Whereas, what you are looking for is JavaScript validator, try JSLint[^]. I entered your JavaScript code there,

JavaScript

function substitute() {
       var myValue = document.getElementById('myTextBox').value;
        
       if(myValue.length == 0) {
	  alert('Please enter a real value in the text box!');
          return;
       }
       var myTitle = document.getElementById('title');
       myTitle.innerHTML = myValue;

Have a look at the errors, there are 6 of them already in the bottom of the page and also, it also tells that JavaScript engine was expecting a } but found end.

WHY don't show error - javascript functions unclosed curly brackets ?

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WHY don't show error - javascript functions unclosed curly brackets ?

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