I want to validate form and then send the values using $.ajax .but it shows Undefined index: is_ajax. why it does not get form_data? why it happens?What change should be done?
here is my script
function validateForm()
{
var oldPassword = document.forms["dsettings"]["oldPassword"].value;
var newPassword = document.forms["dsettings"]["newPassword"].value;
var retypePassword = document.forms["dsettings"]["retypePassword"].value;
if (document.forms["dsettings"]["oldPassword"].value == null || oldPassword == "") {
alert("Enter old password");
return false;
}
else if (document.forms["dsettings"]["newPassword"].value == null || newPassword == "") {
alert("Enter new password");
return false;
}
else if (document.forms["dsettings"]["retypePassword"].value == null || retypePassword == "") {
alert("Retype new password");
return false;
}
else if ( newPassword != retypePassword) {
alert("Retype new password correctly");
return false;
}
else
{
var action = $("#dsettings").attr('action');
var form_data = {
oldPassword: $('#oldPassword').val(),
newPassword: $('#newPassword').val(),
is_ajax: 1
};
$.ajax({
type: "POST",
url: action,
data: form_data,
success: function(response)
{
if(response == "success")
$("#message").html('<p class="success">Successfully changed password!</p>');
else if(response == "wrong_old_password")
{
$("#message").html('<p class="error">Wrong old password!type again!</p>');
}
else
{
$("#message").html('<div class="error">update error.Try again! !</div>');
}
}
});
}
}
my html code
<button type="submit" id="submit" name="submit" onclick="return validateForm()" class="form-submit" >submit</button>
and php code
<?php $is_ajax = $_REQUEST['is_ajax'];
// some codes ?>
Since this seems to be your very first post and very ugly , you need to clean it something like this (which is not perfect either !)
Provide as much as data as possible e. g
HTML
<form action="fakeurl.com" method="post" name="dsettings" id="dsettings" >
<ul>
<li>Old Password: <input type="password" name="oldPassword" /></li>
<li>New Password: <input type="password" name="newPassword" /></li>
<li>Retype New Password: <input type="password" name="retypePassword" /></li>
<li><input type="submit" name="submit" value="Change Password" /></li>
<li><div id="message"/></li>
</ul>
</form>
Javascript
$(document).ready(function(){
$('#dsettings').on('submit',function(event){
changePassword(this)
event.preventDefault();
});
});
function validateChangePassword(frm){
var oldPassword=frm["oldPassword"].value
var newPassword=frm["newPassword"].value
var retypePassword =frm["retypePassword"].value;
if (oldPassword.trim()=="") {
$('#message').html("<p class='error'>Enter old password</p>");
return false;
}
else if (newPassword.trim()=='') {
$('#message').html("<p class='error'>Enter new password</p>");
return false;
}
else if (retypePassword.trim() == "") {
$('#message').html("<p class='error'>Retype new password</p>");
return false;
}
else if ( newPassword != retypePassword) {
$('#message').html("<p class='error'>Retype new password correctly</p>");
return false;
}
else
return true;
}
function changePassword(frm){
if(validateChangePassword(frm)){
var url = $(frm).attr('action');
var data = {
oldPassword: $(frm).find('input[name="oldPassword"]').val(),
newPassword: $(frm).find('input[name="newPassword"]').val(),
retypePassword: $(frm).find('input[name="retypePassword"]').val(),
is_ajax: 1
};
ajaxPost(url,data);
}
return false;
}
function ajaxPost(post_url,post_data){
$.ajax({
type: "POST",
url: post_url,
data: post_data,
success: function(response)
{
if(response == "success")
$("#message")
.html('<p class="success">Successfully changed password!</p>');
else if(response == "wrong_old_password")
{
$("#message")
.html('<p class="error">Wrong old password!type again!</p>');
}
else
{
$("#message")
.html('<div class="error">update error.Try again! !</div>');
}
}
});
}
DEMO
Possible Issues
Avoid using custom js and jquery mix
I suspect you provided any id to element e.g $('#oldPassword').val()
There is good plugin for form validation use that one
Try to change your code on function call with parameter:
function validateForm(e) {
e.preventDefault();
and here:
<button type="submit" id="submit" name="submit" onclick="validateForm(this); return false;" class="form-submit" >submit</button>
From the answers you've given in the comments, what's almost certainly happening is that:
You are not preventing the default submit behavior, so the default submit behavior is taking place
There is an error somewhere in your code that is causing your validateForm() function to fail and for your $.ajax to never run
To troubleshoot this:
Change your button to type="button".
Open up your JS console (you can usually do this by pressing F12 and clicking the Console tab)
See if there are any errors in the console.
Once you figure out what the error is, you should:
Stop using onclick handlers and unobtrusively set up events
Use preventDefault() to prevent default submit events
$(function () {
$("#submit").click(function (e) {
e.preventDefault();
validateForm();
});
});
Include jquery-1.4.3.min.js file before validateForm function call.
<input type="button" name="submit" value="Change Password" onclick="validateForm()" />
Related
I have a prompt box, which when i click on delete user, should ask to confirm if he wants to delete the user,
HTML
<form name="myform" id="myform" action="/AWSCustomerJavaWebFinal/DeleteUser" method="POST" onSubmit="myFunction()">
Choose User:
<br>
<select name="selectUser" multiple style="width: 200px !important; min-width: 200px; max-width: 200px;">
<c:forEach var="user" items="${listUsers.rows}">
<option value="${user.id}">
<c:out value="${user.userId}" />
</c:forEach>
</select>
<input type="submit" value="Delete User" class="btn btn-primary" />
<input type="reset" value="Reset" class="btn btn-primary" id=button1>
</form>
javascript
function myFunction() {
var confirm = prompt("Do you want to continue", "yes");
if (confirm == yes) {
var form = $('#myform');
form.submit(function() {
$.ajax({
type: form.attr('method'),
url: form.attr('action'),
data: form.serialize(),
success: function(data) {
var result2 = data;
alert("deleted")
}
});
return false;
});
$(document).ready(function() {
$(document).ajaxStart(function() {
$("#wait").css("display", "block");
});
$(document).ajaxComplete(function() {
$("#wait").css("display", "none");
});
});
return false;
} else {
alert("User not deleted")
return false;
}
return false;
}
It asks to confirm, and if I press ok after writing yes in the textbox, it goes to the servlet, and does not give the alert("deleted"), and I have returned false, it still refreshes after pressing submit, also, if i press cancel, it still executes and deletes the user. I tried a lot of different approaches but nothing seems to work here. Thanks in advance.
Try using confirm rather than prompt
var r = confirm("Continue delete?");
if (r == true) {
//your logic to delete
} else {
//alert('user dint delete')
}
A nice one-liner :
if( !confirm("Do you want to continue?") ) return alert("User was not deleted.")
return will stop the execution of the function.
You have a form.submit(function() { $.ajax... that will always trigger your ajax call whenever the form is submitted, regardless of any validation mechanism you set up.
Here is a clean, rewritten version of your code :
in HTML : <form onSubmit="confirmSubmission()"> (a bit more explicit than myFunction() ;)
$(document).ready(function() {
var $wait = $("#wait");
$(document).ajaxStart(function() {
$wait.hide();
}).ajaxComplete(function() {
$wait.show();
});
});
function confirmSubmission() {
if ( !confirm("Do you want to continue")) return alert("Submission has been canceled.")
submit();
}
function submit(){
var $form = $('#myform');
$.ajax({
type : $form.attr('method'),
url : $form.attr('action'),
data : $form.serialize(),
success: function(data) {
var result2 = data;
alert("deleted")
}
});
}
I have a registration form that validates a text field, if it's empty when a user clicks/tabs off which shows an error message. My issue with the below code is its a lot to duplicate across several form fields. The below example is for first name but I can't see a way of using what I have to do the same for more than one field.
/* this will call ajax call after entering all the below three fiels */
var $fields = $('#testid');
$fields.live('blur',function(e) {
e.preventDefault();
var $emptyFields = $fields.filter(function() {
return $.trim(this.value) === "";
});
if ($emptyFields.length) {
var frm = $(this).parents('form');
var url=$('#valNameEmail').val();
jQuery.ajax({
url: url,
data: $(this).parents('form').serialize(),
type: 'POST',
dataType: "json",
success: function(response){
if (response.HtmlMessage === 'success'){
$('.reg-alreadyRegistered').html('');
$('.reg-alreadyRegistered').css('display', 'none');
ACC.registration.tickIcon($('#testid'));
var radioExCustValue = $('#registration-form input[name=existingCustomer]:checked').val();
if (userNameAjax === true) {
if (radioExCustValue == 'false'){
$('#regFormSubmit').removeAttr('disabled');
}
else {
if (customerValidation == true){
$('#regFormSubmit').removeAttr('disabled');
}
}
}
emailIDajax = true;
} else {
ACC.registration.errorIcon($('#testid'));
$('.reg-alreadyRegistered').html(response.HtmlMessage);
$('.reg-alreadyRegistered').css('display', 'block');
emailIDajax = false;
$('#regFormSubmit').attr('disabled','disabled');
}
},
error: function(){
//alert(response);
//console.log('ERROR!')
}
});
}
});
You can give the same inputs that require same sort of validation a class (or if you want it for example for all input[type=text] then you can use it for the selector.
So let's say I have a form like this:
<form id="mform">
<input type="text" class="inptxt" name="it1" />
<input type="text" class="inptxt" name="it2" />
<!-- other similar text inputs with the same class -->
<input type="submit" id="sub" value="Submit" />
</form>
I have a function for text inputs which returns false if the field is empty, otherwise true:
$.fn.isValid = function() {
return $.trim($(this).val());
}
And then I get the inputs by class and validate them all at once:
$('#mform').on('submit', function(e) {
e.preventDefault();
var allValid = true;
$('.inptxt').each(function() {
if (!$(this).isValid()) {
$(this).css('background-color', 'red');
allValid = false;
}
else
$(this).css('background-color', 'white');
});
if(allValid) {
//everything's valid ... submit the form
}
});
jsfiddle DEMO
This worked for me:
$('#registration-form input').blur(function(){
if( $(this).val().length === 0 ) {
ACC.registration.errorIcon($(this));
}
else{
ACC.registration.tickIcon($(this));
}
});
thanks for your help
I have a form for user to register new account. I use jquery + ajax to check availability of email address on form submission. In Jquery code I used e.preventDefault(); to prevent form submission if there is any error occurs. I tried the existed email address in the email input and click submit the form. It allows form to submit. It should not do this because ajax reponseText return true means that the email address is already existed in database.
Could anyone please tell me how to fix my code so that if ajax response returns true, it will prevent form submission and shows up errors.
I tried to read and follow this article but fails after so many attempts.
Here is my form:
<form role="form" method="post" id="signupForm" action="index.php?view=signup-gv">
<div class="col-xs-6 border-right">
<div class="form-group">
<label for="exampleInputEmail1">Full Name</label>
<input type="text" class="form-control" id="regname" name="regname" placeholder="Full Name">
</div>
<div class="form-group">
<label for="exampleInputEmail1">Email Address</label><span id="emailcheck"></span>
<input type="email" class="form-control" id="regemail" name="regemail" placeholder="Enter email">
</div>
</div>
<div class="form-group col-xs-6">
<label for="exampleInputPassword1">Password</label>
<input type="password" class="form-control" id="regpass" name="regpass" placeholder="Password">
</div>
<button style="position:relative; left: 15px; top: 10px;" class="btn btn-default" name="register" id="register">Register</button>
</form>
Here my jquery code:
$(document).ready(function(){
$('#regname').focus();
$('#signupForm').submit(function(e) {
var regname = $('#regname');
var regemail = $('#regemail');
var regpass = $('#regpass');
var register_result = $('#register_result');
register_result.html('Loading..');
if(regname.val() == ''){
regname.focus();
register_result.html('<span class="errorss"> * Full name can not be blank</span>');
e.preventDefault();
}
else if ($.trim(regemail.val()).length == 0) {
regemail.focus();
register_result.html('<span class="errorss">* Email address can not be blank</span>');
e.preventDefault();
}
else if(regpass.val() == ''){
regpass.focus();
register_result.html('<span class="errorss">* Password can not be blank</span>');
e.preventDefault();
}
emailCheck().done(function(r){
if(r){
$('#regemail').focus();
$('#register_result').html('<span class="errorss"> This email address is already existed. Please choose another one </span>');
e.preventDefault();
}
});
});
});
function emailCheck() {
var regemail = $('#regemail');
var emailcheck = $('#emailcheck');
emailcheck.html('');
var UrlToPass = {regemail:regemail.val()} ;
$.ajax({
type : 'POST',
cache: false,
data : UrlToPass,
url : 'emailcheck.php',
success: function(responseText){
if(responseText == 0){
return false; // good to go
}
else{
emailcheck.html('<span class="errorss"> This email is existed.</span>');
return true; // This email is registered. Please try different one
}
}
});
}
First you are not returning anything from the emailCheck() function, but you are using it as if it is returning a promise object.
So
$(document).ready(function () {
$('#regname').focus();
$('#signupForm').submit(function (e) {
var regname = $('#regname');
var regemail = $('#regemail');
var regpass = $('#regpass');
var register_result = $('#register_result');
register_result.html('Loading..');
//prevent the form submit
e.preventDefault();
if (regname.val() == '') {
regname.focus();
register_result.html('<span class="errorss"> * Full name can not be blank</span>');
} else if ($.trim(regemail.val()).length == 0) {
regemail.focus();
register_result.html('<span class="errorss">* Email address can not be blank</span>');
} else if (regpass.val() == '') {
regpass.focus();
register_result.html('<span class="errorss">* Password can not be blank</span>');
} else {
emailCheck().done(function (r) {
if (r) {
$('#regemail').focus();
$('#register_result').html('<span class="errorss"> This email address is already existed. Please choose another one </span>');
} else {
$('#signupForm')[0].submit();
}
});
}
});
});
function emailCheck() {
var regemail = $('#regemail');
var emailcheck = $('#emailcheck');
emailcheck.html('');
var UrlToPass = {
regemail: regemail.val()
};
var deferred = jQuery.Deferred();
$.ajax({
type: 'POST',
cache: false,
data: UrlToPass,
url: 'emailcheck.php',
success: function (responseText) {
if (responseText == 0) {
deferred.resolve(false);
} else {
emailcheck.html('<span class="errorss"> This email is existed.</span>');
deferred.resolve(true);
}
},
error: function () {
deferred.reject();
}
});
return deferred.promise();
}
You are confusing yourself with sync and async functions. An ajax function makes an Async call and returns output in its callback. You are trying to wrap an Async function inside a normal function and expecting it to behave synchronously.
Your function returns before the Ajax call receives its output. Use
async: false
$.ajax({
type : 'POST',
cache: false,
async: false,
data : UrlToPass,
Refer to following for dettails:
How to make JQuery-AJAX request synchronous
In a newsletter sign-up form, I would like to make the email disappear after the end user hits enter. I have already added JS to hide and unhide the placeholder text.
The code:
<form id="form" action="https://xxxx.com/subscribe/post-json?u=xxx&id=xx&c=?" method="GET">
<input type="hidden" name="u" value="xxx">
<input type="hidden" name="id" value="xxx">
<input id="email" type="EMAIL" autocapitalize="off" autocorrect="off" name="MERGE0" id="MERGE0" size="25" placeholder= "Type your email and press enter">
<p id="response"></p>
</form>
And the JS:
<script >
var text = document.getElementById("email");
text.onfocus = function() {
if ( text.placeholder == "Type your email and press enter") {
text.placeholder = "";
}
};
text.onblur = function() {
if ( text.placeholder == "") {
text.placeholder = "Type your email and press enter";
}
};
</script>
I tried to create a function to trigger the event but it still didn't work:
function checkEnter(event)
{
if (event.keyCode == 13) {text.placeholder = "cool";}
};
Could you all see what's wrong with my code?
Thank you.
You need to add a event listener for the enter key. You could remove your function checkEnter and use this instead:
document.querySelector('#email').addEventListener('keypress', function (e) {
var key = e.which || e.keyCode;
if (key == 13) {
text.placeholder = "cool";
}
};
I have integrated the code below with the mailchimp form and got the desired results:
var paragraph = document.getElementById('response');
$('#form').submit(function(e) {
var $this = $(this);
$.ajax({
type: "GET", // GET & url for json slightly different
url: "https://xxxxx.com/subscribe/post-json?u=xxxx&id=xxx&c=?",
data: $this.serialize(),
dataType : 'json',
contentType: "application/json; charset=utf-8",
error : function(err) { alert("Could not connect to the registration server."); },
success : function(data) {
if (data.result != "success") {
paragraph.innerHTML = data.msg;
text.placeholder = "Oopsy daisy! Error :-(";
form.reset();
} else {
paragraph.innerHTML = data.msg;
text.placeholder = "Thanks so much!";
form.reset();
}
}
});
return false;
});
I have this javascript function:
function displayMessage() {
var message = $("#msg").val();
if (message == "") {
alert("You need to enter a message");//alert the user
return false;
}
postData = {
"message": message,
};
...
}
What am hoping this achieves is, if the input field is empty, display the alert and remain in the function.If it isn't then continue.
My submit button is linked to another page but this page is displayed anyways regardless of what happens in the if statement.
This is the form code:
<form id="post" action="http://localhost:8080/uploadNewMessage" method="post">
<fieldset>
<div data-role="fieldcontain">
<label for="msg" class="input">Message:</label>
<input type="text" name="msg" id="msg" size="10"/>
</div>
Submit
</fieldset>
</form>
and the full javascript code just incase:
$(document).ready(function() {
// 1. The Registration button
$("#submit").bind('click', function(event) {
displayMessage();
});
});
function doPostRequest(postData) {
$.ajax({
type: "POST",
url: URL,
dataType: "json",
data: postData
});
}
function displayMessage() {
var message = $("#msg").val();
if (message == "") {
alert("You need to enter a message");//alert the user
return false;
}
postData = {
"message": message,
};
...
doPostRequest(postData);
}
You may try something like this:
$("#submit").bind('click', function(event) {
var message = $.trim($("#msg").val());
if(!message.length) {
alert("You need to enter a message");
return false;
}
else {
event.preventDefault();
doPostRequest({"message":message});
}
});
demo
$(function() {
$("#submit").on('click', function(event) {
event.preventDefault(); // prevent default anchor behavior
displayMessage();
});
});
and also:
function displayMessage() {
var message = $.trim( $("#msg").val() ); // trim whitespaces
if (message === "") {
alert("You need to enter a message");
}else{ // Use the else statement
doPostRequest({
"message" : message
});
}
}
The event variable that is passed via your click event handler contains a function named preventDefault. If you don't want the form to submit, call this (event.preventDefault()). This will prevent the submit button from submitting the form.