How do I cancel form submission in submit button onclick event?

I'm working on an ASP.net web application.

I have a form with a submit button. The code for the submit button looks like <input type='submit' value='submit request' onclick='btnClick();'>.

I want to write something like the following:

function btnClick() {
    if (!validData())
        cancelFormSubmission();
}

How do I do this?

Answers:

Answer

You are better off doing...

<form onsubmit="return isValidForm()" />

If isValidForm() returns false, then your form doesn't submit.

You should also probably move your event handler from inline.

document.getElementById('my-form').onsubmit = function() {
    return isValidForm();
};
Answer

Change your input to this:

<input type='submit' value='submit request' onclick='return btnClick();'>

And return false in your function

function btnClick() {
    if (!validData())
        return false;
}
Answer

You need to change

onclick='btnClick();'

to

onclick='return btnClick();'

and

cancelFormSubmission();

to

return false;

That said, I'd try to avoid the intrinsic event attributes in favour of unobtrusive JS with a library (such as YUI or jQuery) that has a good event handling API and tie into the event that really matters (i.e. the form's submit event instead of the button's click event).

Answer

Sometimes onsubmit wouldn't work with asp.net.

I solved it with very easy way.

if we have such a form

<form method="post" name="setting-form" >
   <input type="text" id="UserName" name="UserName" value="" 
      placeholder="user name" >
   <input type="password" id="Password" name="password" value="" placeholder="password" >
   <div id="remember" class="checkbox">
    <label>remember me</label>
    <asp:CheckBox ID="RememberMe" runat="server" />
   </div>
   <input type="submit" value="login" id="login-btn"/>
</form>

You can now catch get that event before the form postback and stop it from postback and do all the ajax you want using this jquery.

$(document).ready(function () {
            $("#login-btn").click(function (event) {
                event.preventDefault();
                alert("do what ever you want");
            });
 });
Answer

you should change the type from submit to button:

<input type='button' value='submit request'>

instead of

<input type='submit' value='submit request'>

you then get the name of your button in javascript and associate whatever action you want to it

var btn = document.forms["frm_name"].elements["btn_name"];
btn.onclick = function(){...};

worked for me hope it helps.

Answer

You need to return false;:

<input type='submit' value='submit request' onclick='return btnClick();' />

function btnClick() {
    return validData();
}
Answer

Why not change the submit button to a regular button, and on the click event, submit your form if it passes your validation tests?

e.g

<input type='button' value='submit request' onclick='btnClick();'>

function btnClick() { 
    if (validData()) 
        document.myform.submit();
} 
Answer

You need onSubmit. Not onClick otherwise someone can just press enter and it will bypass your validation. As for canceling. you need to return false. Here's the code:

<form onSubmit="return btnClick()">
<input type='submit' value='submit request'>

function btnClick() {
    if (!validData()) return false;
}

Edit onSubmit belongs in the form tag.

Answer

It's simple, just return false;

The below code goes within the onclick of the submit button using jquery..

if(conditionsNotmet)
{
return false;
}
Answer

use onclick='return btnClick();'

and

function btnClick() {
    return validData();
}
Answer
function btnClick() {
    return validData();
}
Answer
<input type='button' onclick='buttonClick()' />

<script>
function buttonClick(){
    //Validate Here
    document.getElementsByTagName('form')[0].submit();
}
</script>
Answer

With JQuery is even more simple: works in Asp.Net MVC and Asp.Core

<script>
    $('#btnSubmit').on('click', function () {

        if (ValidData) {
            return true;   //submit the form
        }
        else {
            return false;  //cancel the submit
        }
    });
</script>

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