Develop Reference

On 'Cancel' confirm() still allows form to submit

function next() {
return confirm('Are you sure you want to Foo');
}
<form method="GET" action="/foo" onsubmit="next()">
<input type="hidden" name="delete" value={{$foo} />
<button class="btn btn-warning" type="submit"> Foo</button>
</form>
I am trying to give the user the option to verify that they want to submit the form. Currently the above code shows the popup confirm box, but the form will submit regardless if 'ok' or 'cancel' is clicked.
My understanding of 'confirm()' was that if 'cancel' was clicked the form submission would be stopped.
How does Confirm() work, and how is it best implemented?

You need to precede the next() with a return in your HTML:
function next() {
return confirm('Are you sure you want to Foo');
}
<form method="GET" action="/foo" onsubmit="return next()">
<input type="hidden" name="delete" value={{$foo} />
<button class="btn btn-warning" type="submit"> Foo</button>
</form>
To stop submission, the onsubmit handler needs to return false, which you missed. confirm() returns false when the modal is dismissed.

How to validate an html5 form and show error tips on a button click?

I have a button submit inside a form and just a normal button outside of it. I want to validate a form:
function myButtonHandler(evt) {
if (myForm.checkValidity()) {
alert("yes");
} else {
alert("no");
}
}
This doesn't show the standard error tips inside of input elements when they're invalid when I click on a button -- ones shown by a browser when I click the submit button. How can I get these validation message to pop up when I click on my normal button when the form is invalid?
<form id="my_form">
<input type="text" placeholder="Name" required="true"/>
<input type="submit" id="submit" value="go" />
</form>
No jquery.

You'll need to add the code you've shown to a function that is set up as the click event callback for the normal button:
var myForm = document.querySelector("form"); // reference to form
var btn = document.querySelector("[type='button']"); // reference to normal button
// Set up click event handling function for normal button
btn.addEventListener("click", function(){
if (myForm.checkValidity()) {
alert("yes");
} else {
alert("no");
}
});
<form>
<input type="text" required>
<button type="submit">submit</button>
</form>
<button type="button">Check Validity</button>
If you just want to show the normal browser's validation errors, you can make the second button also a submit button. It's OK for the button to be outside of the form as long as you tie it back to the form with the form attribute.
<form id="theForm">
<input type="text" required>
<button type="submit">submit</button>
</form>
<button type="submit" form="theForm">Check Validity</button>

Accessing HTML form elements with same name from javascript

I am using the following solution (How to best implement Save | Save and Close | Cancel form actions in ASP.NET MVC 3 RC) of multiple submit buttons to allow cancel and save from my MVC form:
<form action="Xxxx" method="post" onsubmit="return validatePost()">
...
<input type="submit" name="actionType" value="Save" />
<input type="submit" name="actionType" value="Cancel" />
</form>
With javascript called onsubmit:
function validatePost() {
if(Blah blah){
return true;
}
}
I only want to do this javascript validation if 'Save' is clicked, but cannot tell which button was clicked from the javascript.
I tried getting the actionType value using document.forms[0].elements["actionType"].value but could not, as there is more than one item named actionType on the form.
Can anyone help?
Thanks

You can use id (http://jsfiddle.net/7p5N5/)
<form method="post">
<input id="save" type="submit" name="actionType" value="Save" />
<input type="submit" name="actionType" value="Cancel" />
</form>
function validate() {
alert('Validate');
return false; // cancel click, true will submit
}
$("#save").click(function () {
return validate();
});
If you don't want to use id, you can use $('input[name="actionType"][value="Save"]') to select the Save button

Are you able to listen to the onclick event of only the 'Save' input and have it use your validatePost function.
Then you could have a different function for the onclick of 'Cancel' to do appropriate action.

Detect post action in a form

I want to do something when a form is submitted.
var ispostaction = false;
$("#myform").submit(function () {
ispostaction = true;
});
When the form is submitted the .submit(function ()) is not called.
Is there anything wrong that I'm doing? I have the form id as myform.
I would appreciate any help.
Here's my xhtml page. I'm using JSF 2
<form id="myform" class="someclass" enctype="application/x-www-form-urlencoded"
action="pagename.jsf" method="post">
// custom input text field
// selectOneMenu
// a few more input text fields
// submit button is below
<input id="javax.faces.ViewState" type="hidden" autocomplete="off" value="...." name="javax.faces.ViewState">
</form>

The jquery documentation:
The submit event is sent to an element when the user is attempting to submit
a form. It can only be attached to <form> elements. Forms can be submitted
either by clicking an explicit <input type="submit">, <input type="image">,
or <button type="submit">, or by pressing Enter when certain form elements
have focus.
Calling the submit function will not trigger the submit event. You can "fix" this by adding a hidden button which you click from jquery instead. Most, if not all, browsers unfortunately display the same behavior.
<html>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
<body>
<form id="myform" enctype="application/x-www-form-urlencoded"
action="posturl" method="post">
// custom input text field
// selectOneMenu
// a few more input text fields
// submit button is below
<input id="javax.faces.ViewState" type="hidden" autocomplete="off" value="...." name="javax.faces.ViewState">
<input type="text" value="a value" />
<input id="submit" type="submit" value="submit" style="display: none;" />
</form>
<script type="text/javascript">
$(document).ready(function() {
$("#myform").bind('submit', function() {
alert('');
});
$("#submit").click();
});
</script>
</body>
</html>

JavaScript Form Submit - Confirm or Cancel Submission Dialog Box

For a simple form with an alert that asks if fields were filled out correctly, I need a function that does this:
Shows an alert box when button is clicked with two options:
If "OK" is clicked, the form is submitted
If cancel is clicked, the alert box closes and the form can be adjusted and resubmitted
I think a JavaScript confirm would work but I can't seem to figure out how.
The code I have now is:
function show_alert() {
alert("xxxxxx");
}
<form>
<input type="image" src="xxx" border="0" name="submit" onclick="show_alert();" alt="PayPal - The safer, easier way to pay online!" value="Submit">
</form>

A simple inline JavaScript confirm would suffice:
<form onsubmit="return confirm('Do you really want to submit the form?');">
No need for an external function unless you are doing validation, which you can do something like this:
<script>
function validate(form) {
// validation code here ...
if(!valid) {
alert('Please correct the errors in the form!');
return false;
}
else {
return confirm('Do you really want to submit the form?');
}
}
</script>
<form onsubmit="return validate(this);">

You could use the JS confirm function.
<form onSubmit="if(!confirm('Is the form filled out correctly?')){return false;}">
<input type="submit" />
</form>
http://jsfiddle.net/jasongennaro/DBHEz/

function show_alert() {
if(!confirm("Do you really want to do this?")) {
return false;
}
this.form.submit();
}

Simple and easy :
<form onSubmit="return confirm('Do you want to submit?') ">
<input type="submit" />
</form>

OK, just change your code to something like this:
<script>
function submit() {
return confirm('Do you really want to submit the form?');
}
</script>
<form onsubmit="return submit(this);">
<input type="image" src="xxx" border="0" name="submit" onclick="show_alert();"
alt="PayPal - The safer, easier way to pay online!" value="Submit">
</form>
Also this is the code in run, just I make it easier to see how it works, just run the code below to see the result:
function submitForm() {
return confirm('Do you really want to submit the form?');
}
<form onsubmit="return submitForm(this);">
<input type="text" border="0" name="submit" />
<button value="submit">submit</button>
</form>

If you want to apply some condition on form submit then you can use this method
<form onsubmit="return checkEmpData();" method="post" action="process.html">
<input type="text" border="0" name="submit" />
<button value="submit">submit</button>
</form>
One thing always keep in mind that method and action attribute write after onsubmit attributes
javascript code
function checkEmpData()
{
var a = 0;
if(a != 0)
{
return confirm("Do you want to generate attendance?");
}
else
{
alert('Please Select Employee First');
return false;
}
}