Develop Reference

How to get php page to receive ajax post from html page

I have a very simple form that has an input field for first name. I captured the form data and transmitted it via ajax to a PHP page using the standard jQuery posting method. However, I am not able at all get any responses from the PHP page that any data was captured on the server-side. I am not sure what I have done wrong or what is missing.
Here is my code.
Form:
<form action="process.php" method="POST">
<div class="form-group">
<div class="form-row">
<div class="col-md-6 mb-3">
<label for="firstName">First name</label>
<input type="text" class="form-control" name="firstName" id="firstName" placeholder="First name">
<div class="d-none" id="firstName_feedback">
<p>Please enter a first name.</p>
</div>
</div>
</div>
</div>
<button class="btn btn-primary" type="submit">Submit form</button>
</form>
Here is my Jquery Ajax call:
<script>
$(document).ready(function() {
$('form').submit(function(event) {
var formData = $("form").serialize();
console.log(formData);
$.ajax({
type: 'POST',
url: 'form.php',
data: formData,
dataType: 'json',
encode: true
})
.done(function(data) {
console.log(data);
});
event.preventDefault();
});
});
</script>
And here is my PHP page:
if(isset($_POST['formData']))
$ajaxData = ($_POST['formData']);
echo $ajaxData;
{
}

In your Ajax function, you're passing the contents of formData to the server, though not as formData but as their original input name.
In this case, you have:
<input type="text" class="form-control" name="firstName" id="firstName" placeholder="First name">
The input's name is firstName, so you need to call $_POST['firstName'] instead of $_POST['formData'].
if (isset($_POST['firstName'])) {
$ajaxData = $_POST['firstName'];
echo $ajaxData;
}
The same applies for any other field you would have in your form, so for example, having another input with the name lastName means you'd have to call $_POST['lastName'] to access it.
There were also some misplaced brackets and parentheses in the PHP code which I accommodated above.

Use Javascript (jQuery) to display result of request in ASP.NET MVC

I have an ASP.NET MVC project and currently I am using ViewData["ResultMessage"] to show the result of a form (which is done after the user submits & refreshes the page).
I want to do it right after he clicks submit (without refreshing the page). So I have to use Javascript for that, which I am new with. No experience what so ever.
How my form looks like is this:
<form id="contactForm" method="post" action="..">
<div class="field half first">
<label for="Name">Name</label>
<input type="text" name="Name" id="Name" placeholder="Your name" required />
</div>
<div class="field half">
<label for="Email">Email</label>
<input type="email" name="Email" id="Email" placeholder="Your email" required />
</div>
<div class="field">
<label for="Message">Message</label>
<textarea name="Message" id="Message" rows="5" placeholder="Your message" required minlength="20"></textarea>
</div>
<input type="submit" value="Send Message" />
<p>#ViewData["ContactActionResult"]</p>
</form>
You can see the result is displayed with Razor using ViewData. Now I want to do it without refreshing the page and learn JS on the way.
What I have tried so far:
$(function () {
$("button").click(function (e) {
e.preventDefault()
$.ajax({
type: "POST",
url: "/Receiver",
data: car,
datatype: "html",
success: function (data) {
alert("Congratulations, it worked!");
$('#contactForm').html(data);
},
error: function(data) {
alert("Failed.");
}
});
});
});
But I am not sure if I did something wrong or simply not implementing it right. I have the above function inside <script> here </script> in my HTML page. Nothing happens when I click the submit button on the form.

If it is an ajax call, It is best if you return a JSON response . You can use the Request.IsAjaxRequest() to determine whether the request is normal form request or ajax call.
You should also consider using to the PRG pattern. After successfully saving, you should do a redirect to a GET action where you can render a view, instead of returning to the same view with a viewbag message. If you want to pass some message to the new view/action, use TempData instead of ViewData.
[HttpPost]
public ActionResult Receiver(string name, string Email)
{
// Your existing code to save
if(Request.IsAjaxRequest())
{
return Json(new { status = "success", message = "Created successfully" });
}
// Normal form submit. So let's follow PRG pattern
TempData["ResultMessage"] = "Created successfully";
return RedirectToAction("Index");
}
You can also put a try/catch and return a json like this for error usecase
return Json(new { status = "error", message = "some serious error" });
In Index action/view, you can read TempData["ResultMessage"] and display to user.
Now, for the ajax usecase, in your current view, you can add a div to show the message
<form id="contactForm" method="post" asp-action="Receiver">
<div id="msg"></div>
<div class="field half first">
<label for="Name">Name</label>
<input type="text" name="Name" id="Name" placeholder="Your name" required />
</div>
<div class="field half">
<label for="Email">Email</label>
<input type="email" name="Email" id="Email" required />
</div>
<div class="field">
<label for="Message">Message</label>
<textarea name="Message" id="Message" rows="5"
placeholder="Your message" required minlength="20"></textarea>
</div>
<input type="submit" value="Send Message" />
</form>
and now in your ajax call's success callback, check the json response coming back from server and show the message property as needed. If you are putting the script inside the razor view file, make sure you are putting it inside a Scripts section so that it will be evaluated in the proper order (After jQuery is loaded, assuming you load jQuery before calling RenderSection("scripts") inside the layout)
#section Scripts
{
<script>
$(function (){
$("#contactForm").submit(function (e){
e.preventDefault()
$.ajax({
type: "POST",
url: $(this).attr("action"),
data: car,
success: function (data){
if (data.status === "success")
{
$('#msg').html(message);
}
//to do : handle statuss=="error" as needed
},
error: function (data)
{
alert("Failed.");
}
});
});
});
</script>
}
For asp.net core, you can write a IsAjaxRequest method in your base controller and use that. jQuery will add X-Requested-With header with value XMLHttpRequest for your ajax calls.
protected bool IsAjaxRequest()
{
return Request.Headers["X-Requested-With"] == "XMLHttpRequest";
}

jQuery on click not returning any value

What I am trying to do is to get all inputs and data when someone click the submit button.
My code HTML is this:
<form id="form" action="index.php" method="POST" class="register" name="Register">
<label>Patient Name:</label>
<input id="pname" name="pname" placeholder="John Doe" type="text" data-role="justText" value=""><br><br>
<label>Phone Number:</label>
<input id="ptel" type="tel" name="ptel" value=""><br><br>
<label>Email:</label>
<input id="pemail" placeholder="example#gmail.com" type="email" value=""><br><br>
<button id="submit" class="submit" type="submit" name="register">Registrar</button>
</form>
Don't know if it's the best use the button or input tag for submit the form. And the jQuery to handle what I am trying to do is this:
jQuery.fn.extend({
hello: function () {
submitbutton = $(this).find('button').attr('id');
$inputs = $(this).find('input');
knowInputs = function() {
$inputs.each(function () {
console.log( $(this).attr('name') );
});
}
$('#'+submitbutton).on('click', function () {
knowInputs();
})
return this;
}
});
So, I put the form ID and init the function like this:
$(#form).hello();
P.D.: If I put the code knowInputs outside the on(click), it seems to work fine. My problem is when I am trying to gather all when clicking the submit button.
Any help shall be appreciated. Thanks in advance!

Forms have a native Javascript event, submit. jQuery also has a function, $.serialize which will turn a form into an encoded URL string, which is probably the most standard format you'd want it in. You can easily convert this into JSON or a JS Object.
$('#form').submit(function(e){
e.preventDefault();
return $(this).serialize();
});

Required Field without Submit button after Ajax

I am trying to have my all my text/email input forms have a required attribute before you can "Submit" The email
But since I am using some Ajax to keep the page from refreshing after pressing the button the required attribute will not work.
This is why I am asking for an alternative for required with Javascript or jQuery (trying to prevent email form spam).
HTML (FORM)
<form id="contact">
<div class="form-group">
<label for="name">Voornaam*</label>
<input name="fn" type="text" class="form-control" id="fn" required>
</div>
<div class="form-group">
<label for="name">Achternaam*</label>
<input name="ln" type="text" class="form-control" id="ln" required>
</div>
<div class="form-group">
<label for="email">Email-address*</label>
<input name="email" type="email" class="form-control" id="email" required>
</div>
<div class="form-group">
<label for="message">Bericht*</label>
<textarea name="message" required class="form-control" id="message" rows="6"></textarea>
</div>
<button type="button" onClick="doIets(); this.form.reset();"
name="submit" id="submit" class="btn btn-primary">Verstuur <span id="result"></span></button>
<div id="result2"></div>
</form>
Ajax script
<script type="text/javascript">
function doIets()
{
console.log("doe iets");
var data = {
ck: (new Date()).getTime(),
fn: $("#fn").val(),
ln: $("#ln").val(),
email: $("#email").val(),
message: $("#message").val()
};
$.ajax({
type: "POST",
url: "sendmail.php",/*php file path*/
data: data,
beforeSend: function(){
$('#result').html('<img src="loader" style="height:10px;"/>')
},
success: function(data){
$('#result').hide();
$('#result2').html(data);
}
});
}
</script>

You will need to use e.preventDefault() when they click on the submit button and then validate the form and after that submit it using the ajax call you created above.

since you already read out the data, you can check whether your message is long enough for you via
data.message.length
if it is 0 (or lower than a threshold you defined), you can skip the ajax call and return some info to the user.
You might also want to trim the message first in order to be sure there aren't only whitespace in there.

Here is part from my code, where I bind the submit event to my form and check by looping if any required field is empty or if I want to do any such thing.
This way may help you--
$('.form .contact-form').submit(function(e) {
e.preventDefault();
$('.form .message').eq(0).html("<i>Sending... Please Wait...</i>");
var form = $(this);
var validated = true;
$('input[type="text"]',this).each(function(){
if($(this).val().length < 1){
$(this).addClass('error').focus();
validated = false;
return false;
}
});
if(validated === true){
$.post(__asyn.ajaxurl, $('.form form').eq(0).serialize(), function(data, textStatus, xhr) {
console.log(data);
});
}
});

Just pass the event object to your handler onClick="doIets(event);
and then add
function doIets(event) {
event.preventDefault();
...
}

How do I submit form using ajax

I have my form and my ajax laid out but I am not sure how to submit the form using the ajax. I've tried $('#testform').submit() but it didn't call my ajax when I wrapped it with the submit. I might of been doing it wrong. How do I get my form to submit through the ajax and not submit regularly?
<form id="testform" action="https://example.com/api/payments/" method="post">
Name<input type="text" name="name" id="name">
Card Number <input type="text" name="card_number" id="card_number" maxlength="16">
Exp Month <input type="text" name="exp_month" id="exp_month">
Exp Year <input type="text" name="exp_year" id="exp_year">
CVC <input type="text" name="cvc" id="cvc" maxlength="3">
Amount <input type="text" name="amount" id="amount">
<input type="submit" id="submit">
frm = $('#testform');
frm.submit(function(ev)
{
$.ajax({
type: frm.attr('method'),
url: frm.attr('action'),
dataType: "html",
//Set the HTTP headers for authentication
beforeSend: function (xhr) {
xhr.setRequestHeader('api_key', 'tiyndhinzrkzti5ody0');
xhr.setRequestHeader('email', 'example#example.com');
},
//Serialize the data sent from the form inputs
data: frm.serialize(),
success: function(data) {
$('#return').append(data);
}
});
ev.preventDefault();
});

Instead of frm.submit(function(ev) try the following code
$("#testform").on('submit', function(ev) {
ev.preventDefault();
...
});
After clicking on the submit button you should see the ajax being posted in the console. The "magic" is to attach a handler to the submit event instead of invoking the event itself. Additionally, you had a typo in your previous code ($('testform') instead of $("#testform"))