JAVASCRIPT

js preventdefault

function(event) {
  event.preventDefault();
}

preventdefault

for arrow function
const handleSubmit = (e)=>{
e.preventDefault()
}

preventdefault javascript

document.querySelector("#id-checkbox").addEventListener("click", function(event) {
         document.getElementById("output-box").innerHTML += "Sorry! <code>preventDefault()</code> won't let you check this!<br>";
         event.preventDefault();
}, false);

preventdefault 0

$('#test').on("keypress",function (evt) {
   if (this.value.length == 1 && evt.which == 48 )
   {
      evt.preventDefault();
   }
});

preventdefault javascript

< form action = javascript: void(0);>
****************OR********************
  $("#yourFormId").on("submit",function(event){event.preventDefault()})