What is the reason why setting 'onClick' as an event handler is not flagged as a syntax error?

I am currently working on a JavaScript code snippet where I am trying to change the headline text when it is clicked. The code I have written is:

var headline = document.getElementById("mainHeading");
headline.onClick = function() {
    headline.innerHTML = "You clicked the headline.";
};

However, despite my efforts, clicking the headline does not trigger the desired action. It only works when I use onclick instead of onClick (without capital letter C).

To make matters worse, even after debugging with Chrome DevTools and Firebug, no syntax errors related to onClick are being displayed.

If anyone has any tips or suggestions on how I can debug this issue effectively, please let me know.

javascriptjavascript-debugger

Answer №1

When dealing with the onclick event in JavaScript, it is important to remember that it is case sensitive. This means that you must ensure the casing matches exactly when setting the event handler. By setting the property as onClick, you are essentially creating a custom property on your element to store the specified function. However, since nothing accesses this property directly, it can easily go unnoticed in debuggers. JavaScript allows for the setting of arbitrary properties on any object, which adds a layer of complexity to debugging such issues.

Answer №2

There is no syntax error for using onClick, as it is a valid variable name.

When you set onClick as a function on the object headline, everything works fine and there are no errors.

However, the function won't be triggered unless the 'browser' detects a click event and calls onclick.

If you do not manually invoke the onClick function, it will never run.

To make it work, use onclick instead.

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