how to change the action of submit button after submission - javascript

I want to change the submit button to call signout function after the user signed in
<html>
<head>
/* Here I have the links for jQuery and bootstrap so, they are working properly
</head>
<body>
<form onsubmit="signIn(event)">
<input type="text" id="username" />
<input type="password" id="password" />
<input type="submit" id="connect_disconnect">
</form>
</body>
<script type="text/javascript">
function signIn() {
code ....
// Below I just change the caption of the submit button from 'Connect' to
// 'Disconnect'
$("#connect_disconnect").text('Disconnect');
}
</script>
<script type="text/javascript">
function signOut() {
code...
}
</script>
</html>
with the above code, when I click on submit button, it will call the signIn function even when I am already signed in. I want it to call signOut function when I am already signed it. any ideas?
Thanks in advance and please let me know if my question is not clear.

If you apply a "submit" event handler to your form, then run event.preventDefault() you can prevent the form from submitting the native way and you can run any Javascript you want.
Below I've added a code example showing what you could do to capture the event.
I try not to add too much philosophy into my answers, but I've decided to include an example of a linked Javascript file.
HTML
<body>
<form id="theForm">
<input type="text" id="username" />
<input type="password" id="password" />
<input type="submit" id="connect_disconnect">
</form>
<script type="text/javascript" src="/script.js"></script>
</body>
Javascript (script.js)
(function() { // Create closure to avoid global-scoped variables
var theForm = document.getElementById('theForm'); // Select the <form> element
theForm.addEventListener('submit', handleFormSubmission); // Bind event listener.
function handleFormSubmission(event) {
event.preventDefault(); // Keep the form from taking any further native action
if( /* user is signed in */ )
signOut();
else
signIn();
}
function signIn() {
// Sign In Code
}
function signOut() {
// Sign Out Code
}
})(); // End closure

Related

jcryption form submit not working with button click

I am using jcryption for encrypting the form.It works fine if i use submit button in form. Instead if i use button and submit the form manually my jcryption method is not getting called.
below is my code
<html>
<head>
<script type="text/javascript">
$(document).ready(function() {
$("#login").bind('click', function(){
document.authenticatorform.username.value=$("#username").val();
document.authenticatorform.password.value=$("#password").val();
alert('outer hello');
$("#authenticatorform").jCryption({
getKeysURL:"<%=request.getContextPath()%>/keypairrequest",
beforeEncryption:function() {
alert('inner hello');
document.authenticatorform.submit()
return true; },
encryptionFinished:function(encryptedString, objectLength) {return true;}
});
});
});
</script>
<body>
<form:form method="post" action="login.htm" name="authenticatorform" id="authenticatorform">
<input type="hidden" name="username"/>
<input type="hidden" name="password"/>
</form:form>
<input type="button" id="login"/>
</body>
</html>
In the code only outer alert is printing.
Is it possible to call jcryption in other than submit button?
Any help will be greatly appreciated!!!!!
Try using on click function instead of bind
Try this:
$("#login").on('click', function(){
//your codes goes here
}

How do I manually test JavaScript?

I'm trying to learn javascript by making a simple price checking website using the Best Buy products API.
How do I "run" the javascript? My form takes in a product ID number (the SKU) and sends it to validateSKU() on submit. The function processData(data) searches for the product using the SKU.
Nothing is happening when I test the site, and any help would be great; thanks!
<!DOCTYPE html>
<html>
<head>
<title>Learn JavaScript</title>
</head>
<body>
<form id="bestBuyForm" name="bestBuyForm" onsubmit="validateSKU()">
<input id="SKU" name="SKU" required="" type="text">
<label for="SKU">SKU</label>
<input id="email" name="email" type="email">
<label for="email">Email</label>
<input class="button" id="submit" name="submit" type="submit">
</form>
<script>
function validateSKU() {
var SKU = document.forms["bestBuyForm"]["SKU"].value;
var bby = require('bestbuy')('process.env.BBY_API_KEY');
var search = bby.products('sku=' + SKU);
search.then(processData);
}
function processData(data) {
if (!data.total) {
console.log('No products found');
} else {
var product = data.products[0];
console.log('Name:', product.name);
console.log('Price:', product.salePrice);
}
}
</script>
</body>
</html>
Use web console to see what does happen and read about the console API.
Try to bind validateSKU with HTML element addEventListener method. Also you should prevent default form behaviour which cause page reloading on submit. Call event.preventDefault().
Working example code:
<html>
<form id="someForm">
...
<button type="submit">Submit</submit>
</form>
<script>
function validateSKU(event) {
console.log('IT works');
event.preventDefault();
// ...here your code
}
var form = document.getElementById('someForm');
form.addEventListener('submit', validateSKU, false);
</script>
</html>

Is it possible to execute simple javascript statments from an input field in a document?

In the example below I've attached a function main to an input field. the function contains instructions to send an alert with a variable message (whatever the user enters into the field).
<form>
<input type="text" onsubmit="main()" />
<input type="submit" />
</form>
<script>
function main (param) {
alert(param)
}
//main();
</script>
It doesn't work, but I believe that's because I've made some noob error that I'm failing to recognize. The result of a functioning version of this code would be the ability to submit "hello world" and produce an alert box stating 'hello world' (without quotes).
But, further than this, I'd like to be able to pass the likes of main("hello world"); or just alert('hello world'); to the input field to produce the same result.
The problem I think I'm running into is that the page is refreshed every time I submit. There are a few questions on here with similar problems where people have suggested the use of onsubmit="main(); return false;", but in fact this does not seem to work.
Looks like you want to eval() the value of the input.
Use with caution, has security impact...
Returning false from a handler stops the regular action so you have no redirect after submitting:
<form onsubmit="main(); return false;">
<input id="eval-input" type="text" />
<input type="submit" />
</form>
<script>
function main () {
eval(document.getElementById('eval-input').value);
}
</script>
Here's how you can detect a form submission:
<form onsubmit="foo()">
<input type="text">
<input type="submit">
</form>
<script>
function foo(){
alert("function called");
}
</script>
I however advise you do this (preference), if you desire to manage the form data through a function:
<form id="myform">
<input type="text">
<input type="submit">
</form>
<script>
document.getElementById("myform").onsubmit=function(event){
alert("function called");
//manage form submission here, such as AJAX and validation
event.preventDefault(); //prevents a normal/double submission
return false; //also prevents normal/double a double submission
};
</script>
EDIT:
use eval() to execute a string as JavaScript.
jQuery way:
You create event listener which will be triggered when user click 'submit'.
<form>
<input type="text" id="text"/>
<input type="submit" />
</form>
<script>
$( "form" ).submit(function( event ) {
event.preventDefault();
alert( $('#text').val() );
});
</script>
To prevent page reloading - you should use event.preventDefault();
Pure JavaScript:
<form>
<input type="text" id="text"/>
<input type="submit" id="submit" />
</form>
<script>
var button = document.getElementById("submit");
var text = document.getElementById("text");
button.addEventListener("click",function(e){
alert(text.value);
},false);
</script>
If I understand what you want to do, you can call the function like this, and writing params[0].value you can access the input value:
function main(params) {
//dosomething;
document.write(params[0].value);
}
<form onsubmit="main(this)">
<input type="text">
<input type="submit">
</form>
Try something like this
onchange="main()"
onmouseenter, onMouseOver, onmouseleave ...
<input type="text" onmouseenter="main()" />

Why Jquery form submit event not firing?

I am trying to submit a form through jquery. I want to get my form submit event get fired when jquery submits the form.
But when form is submitted successfully, submit event handler is not called successfully.
Below is the code :
<html>
<head>
<title>forms</title>
<script src="../common/jquery-1.6.2.min.js"></script>
<script>
$('#testform').submit(function() {
$.post($(this).attr("action"), $(this).serialize(), function(html) {
$("#menu").html('<object>'+html+'</object>');
});
return false; // prevent normal submit
});
</script>
</head>
<body>
<form id="testform" action="<%=getURL%>" method="post" >
<!-- <input type="hidden" value="DocQrySetup" name=form>
<input type="hidden" value="bdqdb1" name=config>-->
<input type="hidden" value="test" name=otherParams>
</form>
<script language=javascript>
$('#testform').submit();
</script>
<div id="menu" style="position:relative; bottom: 0; overflow:hidden;">
</div>
</body>
I searched all the forums but was not able to get the resolution.
The form doesn't exist when you run the first script so your event handler has nothing to attach to.
Either need to move that handler to after the form or wrap it in
$(document).ready(function() {
$('#testform').submit(function() {
/* your code */
});
});
The form isn't defined when you attach the event listener, move the code where you attach the event listener after the form or wrap the code with:
jQuery(document).ready(function ($) {
...
});
And add a submit button.
...
<input type="submit" value="submit">
...

Jquery submit vs. javascript submit

I am trying to invoke a form validation when clicked on ordinary button. This seems to work good with jQuery, but not with plain javascript. Can anyone explain this difference between jquery's .submit() and javascript's .submit() methods? Or what am I doing wrong?
<html>
<head>
<title>Form Submit</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
function validateForm(form) {
if (form.username.value=='') {
alert('Username missing');
return false;
}
return true;
}
</script>
</head>
<body>
<form action="index.php" name="loginform" method="post" onsubmit="return validateForm(this);">
<input name="username" placeholder="username" required="required" type="text" />
<input name="send1" type="button" value="Login1" onclick="$(document.forms.loginform).submit();" />
<input name="send2" type="button" value="Login2" onclick="document.forms.loginform.submit();" />
<input name="send3" type="submit" value="Login3" />
Login4
Login5
</form>
</body>
</html>
The DOM submit() method does not trigger submit events. jQuery's does.
I know this is an old question, but it is not been answered very well, so here you go:
The submit() DOM method in vanilla javascript is used to submit a form, but the JQuery submit() method is used to trigger a submit event.
You need to use the submit event
Example:
cosnt form = document.querySelecor('form')
form.addEventListener('submit', e => {
e.preventDefault()
/* Other stuff */
})
OR
const form = document.qeurySelector('form')
form.onsubmit = e => {
e.preventDefault()
/* Other stuff */
})

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