javascript - Access event to call preventdefault from custom function originating from onclick attribute of tag - Stack Overflow

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I have links like this:

<a href="#" onclick="myfunc({a:1, b:'hi'})" />click</a>
<a href="#" onclick="myfunc({a:3, b:'jo'})" />click</a>

And I would like to do a preventDefault() inside myfunc(), because a # will be added in the address bar when clicking on the link (without doing return false; or href='javascript:void(0);')

Is this possible? Can I get the event inside myfunc()

I have links like this:

<a href="#" onclick="myfunc({a:1, b:'hi'})" />click</a>
<a href="#" onclick="myfunc({a:3, b:'jo'})" />click</a>

And I would like to do a preventDefault() inside myfunc(), because a # will be added in the address bar when clicking on the link (without doing return false; or href='javascript:void(0);')

Is this possible? Can I get the event inside myfunc()

• javascript
• jquery
• html

Share Improve this question Follow edited Feb 11, 2020 at 6:58 Shashanth 5,18088 gold badges4242 silver badges5252 bronze badges asked Dec 23, 2011 at 9:44 OmuOmu 71.1k9393 gold badges284284 silver badges413413 bronze badges 4

• 6 What's wrong with return false? – Alex Commented Dec 23, 2011 at 9:51
• 6 it stops propagation too – Omu Commented Dec 23, 2011 at 9:56
• 4 return false only stops propagation within jQuery. – cruzanmo Commented Nov 6, 2014 at 19:32
• 1 @cruzanmo That is not correct. It is a globally-scoped ECMAScript reserved function. – 9pfs Commented Mar 17, 2021 at 1:07

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11 Answers 11

Sorted by: Reset to default 193

I believe you can pass in event into the function inline which will be the event object for the raised event in W3C compliant browsers (i.e. older versions of IE will still require detection inside of your event handler function to look at window.event).

A quick example.

function sayHi(e) {
   e.preventDefault();
   alert("hi");
}

<a href="http://google.co.uk" onclick="sayHi(event);">Click to say Hi</a>

1. Run it as is and notice that the link does no redirect to Google after the alert.
2. Then, change the event passed into the onclick handler to something else like e, click run, then notice that the redirection does take place after the alert (the result pane goes white, demonstrating a redirect).

The simplest solution simply is:

<a href="#" onclick="event.preventDefault(); myfunc({a:1, b:'hi'});" />click</a>

It's actually a good way of doing cache busting for documents with a fallback for no JS enabled browsers (no cache busting if no JS)

<a onclick="
if(event.preventDefault) event.preventDefault(); else event.returnValue = false;
window.location = 'http://www.domain.com/docs/thingy.pdf?cachebuster=' + 
Math.round(new Date().getTime() / 1000);" 
href="http://www.domain.com/docs/thingy.pdf">

If JavaScript is enabled, it opens the PDF with a cache busting query string, if not it just opens the PDF.

Try this:

<script>
    $("a").click(function(event) {
        event.preventDefault(); 
    });
</script>

Can you not just remove the href attribute from the a tag?

<script type="text/javascript">
$('a').click(function(){
   return false;
});
<script>

Add a unique class to the links and a javascript that prevents default on links with this class:

<a href="#" class="prevent-default" 
   onclick="$('.comment .hidden').toggle();">Show comments</a>

<script>
  $(document).ready(function(){

    $("a.prevent-default").click(function(event) {
         event.preventDefault(); 
          });
  });
</script>

I think when we use onClick we want to do something different than default. So, for all your links with onClick:

$("a[onClick]").on("click", function(e) {
  return e.preventDefault();
});

Simple!

onclick="blabla(); return false"

You can access the event from onclick like this:

<button onclick="yourFunc(event);">go</button>

and at your javascript function, my advice is adding that first line statement as:

function yourFunc(e) {
    e = e ? e : event;
}

then use everywhere e as event variable

Without any JS library or jQuery. To open a nice popup window if possible. Fails safely to normal link open.

<a href="https://acme.com/" onclick="onclick="openNewWindow(event, this.href);">...</a>

And the helper function:

function openNewWindow(event, location) {
  if (event.preventDefault && event.stopImmediatePropagation) { 
    event.preventDefault(); 
    event.stopImmediatePropagation(); 
  } else {
    event.returnValue = false; 
  }
  window.open(location, 'targetWindow', 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=800,height=450');
}

e.preventDefault(); from https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault

Or have return false from your method.

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