One way to stop form submission is to return false from your JavaScript function.
When the submit button is clicked, a validation function is called. I have a case in form validation. If that condition is met I call a function named returnToPreviousPage();
function returnToPreviousPage() {
window.history.back();
}
I am using JavaScript and Dojo Toolkit.
Rather going back to the previous page, it submits the form. How can I abort this submission and return to the previous page?
This question is related to
javascript
html
forms
Use prevent default
Dojo Toolkit
dojo.connect(form, "onsubmit", function(evt) {
evt.preventDefault();
window.history.back();
});
jQuery
$('#form').submit(function (evt) {
evt.preventDefault();
window.history.back();
});
Vanilla JavaScript
if (element.addEventListener) {
element.addEventListener("submit", function(evt) {
evt.preventDefault();
window.history.back();
}, true);
}
else {
element.attachEvent('onsubmit', function(evt){
evt.preventDefault();
window.history.back();
});
}
All your answers gave something to work with.
FINALLY, this worked for me: (if you dont choose at least one checkbox item, it warns and stays in the same page)
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form name="helloForm" action="HelloWorld" method="GET" onsubmit="valthisform();">
<br>
<br><b> MY LIKES </b>
<br>
First Name: <input type="text" name="first_name" required>
<br />
Last Name: <input type="text" name="last_name" required />
<br>
<input type="radio" name="modifyValues" value="uppercase" required="required">Convert to uppercase <br>
<input type="radio" name="modifyValues" value="lowercase" required="required">Convert to lowercase <br>
<input type="radio" name="modifyValues" value="asis" required="required" checked="checked">Do not convert <br>
<br>
<input type="checkbox" name="c1" value="maths" /> Maths
<input type="checkbox" name="c1" value="physics" /> Physics
<input type="checkbox" name="c1" value="chemistry" /> Chemistry
<br>
<button onclick="submit">Submit</button>
<!-- input type="submit" value="submit" / -->
<script>
<!---
function valthisform() {
var checkboxs=document.getElementsByName("c1");
var okay=false;
for(var i=0,l=checkboxs.length;i<l;i++) {
if(checkboxs[i].checked) {
okay=true;
break;
}
}
if (!okay) {
alert("Please check a checkbox");
event.preventDefault();
} else {
}
}
-->
</script>
</form>
</body>
</html>
The following works as of now (tested in Chrome and Firefox):
<form onsubmit="event.preventDefault(); validateMyForm();">
Where validateMyForm() is a function that returns false
if validation fails. The key point is to use the name event
. We cannot use for e.g. e.preventDefault()
.
Lots of hard ways to do an easy thing:
<form name="foo" onsubmit="return false">
Lets say you have a form similar to this
<form action="membersDeleteAllData.html" method="post">
<button type="submit" id="btnLoad" onclick="confirmAction(event);">ERASE ALL DATA</button>
</form>
Here is the javascript for the confirmAction function
<script type="text/javascript">
function confirmAction(e)
{
var confirmation = confirm("Are you sure about this ?") ;
if (!confirmation)
{
e.preventDefault() ;
returnToPreviousPage();
}
return confirmation ;
}
</script>
This one works on Firefox, Chrome, Internet Explorer(edge), Safari, etc.
If that is not the case let me know
I would recommend not using onsubmit
and instead attaching an event in the script.
var submit = document.getElementById("submitButtonId");
if (submit.addEventListener) {
submit.addEventListener("click", returnToPreviousPage);
} else {
submit.attachEvent("onclick", returnToPreviousPage);
}
Then use preventDefault()
(or returnValue = false
for older browsers).
function returnToPreviousPage (e) {
e = e || window.event;
// validation code
// if invalid
if (e.preventDefault) {
e.preventDefault();
} else {
e.returnValue = false;
}
}
Hemant and Vikram's answers didn't quite work for me outright in Chrome. The event.preventDefault(); script prevented the the page from submitting regardless of passing or failing the validation. Instead, I had to move the event.preventDefault(); into the if statement as follows:
if(check if your conditions are not satisfying)
{
event.preventDefault();
alert("validation failed false");
returnToPreviousPage();
return false;
}
alert("validations passed");
return true;
}
Thanks to Hemant and Vikram for putting me on the right track.
Just use a simple button
instead of a submit button. And call a JavaScript function to handle form submit:
<input type="button" name="submit" value="submit" onclick="submit_form();"/>
Function within a script
tag:
function submit_form() {
if (conditions) {
document.forms['myform'].submit();
}
else {
returnToPreviousPage();
}
}
You can also try window.history.forward(-1);
E.g if you have submit button on form ,inorder to stop its propogation simply write event.preventDefault(); in the function which is called upon clicking submit button or enter button.
Simply do it....
<form>
<!-- Your Input Elements -->
</form>
and here goes your JQuery
$(document).on('submit', 'form', function(e){
e.preventDefault();
//your code goes here
//100% works
return;
});
Base on @Vikram Pudi answer, we can also do like this with pure Javascript
<form onsubmit="submitForm(event)">
<input type="text">
<input type="submit">
</form>
<script type="text/javascript">
function submitForm(event){
event.preventDefault();
}
</script>
Source: Stackoverflow.com