onclick="javascript:func()" vs. onclick="func()"
javascript
Solution
`javascript:` inside an `onwhatever=""` handler is a no-op. The content of this attribute is always JavaScript so `javascript:` defines a label - but outside of a `switch` block or a loop (where you can use it to `break`/`continue` to the position of the label) it does nothing.
However, using inline event handlers is discouraged, there are better ways to register event handlers.
While not mentioned in the question, it's worth noting that using `javascript:` in the `href` attribute does work (and in there it is actually necessary) but is highly discouraged for various reasons:
- `this` does not point to the element
- Calling a function returning a value causes the browser to leave the site
- Clicking the link with disabled JavaScript breaks
- Trying to open the link in a new window/tab breaks
So, if you really have to use inline events, always use `onclick=""` etc. without `javascript:`.
Problem
Is there any difference between ``` <input type="submit" value="Register" onclick="javascript:submitTheForm();"> ``` and ``` <input type="submit" value="Register" onclick="submitTheForm();"> ``` Should I use `javascript:` before a JS function call?