How to prevent default event handling in an onclick method?

How to prevent default in an onclick method? I have a method in which I am also passing a custom value

<a href="#" onclick="callmymethod(24)">Call</a>
function callmymethod(myVal){
    //doing custom things with myVal
    //here I want to prevent default
}

Answers:

Answer

Let your callback return false and pass that on to the onclick handler:

<a href="#" onclick="return callmymethod(24)">Call</a>

function callmymethod(myVal){
    //doing custom things with myVal
    //here I want to prevent default
    return false;
}

To create maintainable code, however, you should abstain from using "inline Javascript" (i.e.: code that's directly within an element's tag) and modify an element's behavior via an included Javascript source file (it's called unobtrusive Javascript).

The mark-up:

<a href="#" id="myAnchor">Call</a>

The code (separate file):

// Code example using Prototype JS API
$('myAnchor').observe('click', function(event) {
    Event.stop(event); // suppress default click behavior, cancel the event
    /* your onclick code goes here */
});
Answer

In my opinion the answer is wrong! He asked for event.preventDefault(); when you simply return false; it calls event.preventDefault(); AND event.stopPropagation(); as well!

You can solve it by this:

<a href="#" onclick="callmymethod(event, 24)">Call</a>
function callmymethod(e, myVal){
    //doing custom things with myVal

    //here I want to prevent default
    e = e || window.event;
    e.preventDefault();
}
Answer

You can catch the event and then block it with preventDefault() -- works with pure Javascript

document.getElementById("xyz").addEventListener('click', function(event){
    event.preventDefault();
    console.log(this.getAttribute("href"));
    /* Do some other things*/
});
Answer

Just place "javascript:void(0)", in place of "#" in href tag

<a href="javascript:void(0);" onclick="callmymethod(24)">Call</a>
Answer

It would be too tedious to alter function usages in all html pages to return false.

So here is a tested solution that patches only the function itself:

function callmymethod(myVal) {
    // doing custom things with myVal

    // cancel default event action
    var event = window.event || callmymethod.caller.arguments[0];
    event.preventDefault ? event.preventDefault() : (event.returnValue = false);

    return false;
}    

This correctly prevents IE6, IE11 and latest Chrome from visiting href="#" after onclick event handler completes.

Credits:

Answer

If you need to put it in the tag. Not the finest solution, but it will work.

Make sure you put the onclick event in front of the href. Only worked for my this way.

<a onclick="return false;" href="//www.google.de">Google</a>
Answer

Give a class or id to the element and use jquery function unbind();

$(".slide_prevent").click(function(){
                $(".slide_prevent").unbind();
              });
Answer

Try

<a href="#" onclick="callmymethod(24); return false;">Call</a>
Answer

This worked for me

<a href="javascript:;" onclick="callmymethod(24); return false;">Call</a>
Answer

You can use:

event.stopPropagation();

https://dom.spec.whatwg.org/#dom-event-stoppropagation

Answer

Another way to do that is to use the event object inside the attribute onclick (without the need to add an additional argument to the function to pass the event)

function callmymethod(myVal){
    console.log(myVal);
}
<a href="#link" onclick="event.preventDefault();callmymethod(24)">Call</a>

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