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On form submission I get an error 'Method not allowed' - Javascript [closed]

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I have below html and javascript but on form submission I get an error Method not allowed though I would like to stay on the same index.html and show the success message.
I have debugged the javascript and it bypasses the if condition even I put valid info.
index.html
<form method="post" name="FrmEnquiry" id="FrmEnquiry" onsubmit=" return sendEnquiryform();">
<input name="name" id="name" required="required" placeholder="Your Name">
<input name="email" id="email" type="email" required="required" placeholder="Your Email">
<div class="clearfix"> </div>
<textarea name="message" id="message" cols="20" rows="5" required="required" placeholder="Message"></textarea>
<div class="submit">
<input id="submit" name="submit" type="submit" value="Submit">
</div>
</form>
<span id="sucessMessage"> </span>
javascript.js
var name = $('#name').val();
var email = $('#email').val();
var message = $('#message').val();
$.post('mail.php', '&name=' + name + '&email=' + email + message, function(
result,
status,
xhr
) {
if (status.toLowerCase() == 'error'.toLowerCase()) {
alert('An Error Occurred..');
} else {
alert(result);
$('#sucessMessage').html(result);
}
}).fail(function(xhr, status, error) {
console.log(error); // this shows 'method not allowed' and then i get below alert
alert('something went wrong. Please try again');
});
return false;
}

You need to add action tag to your form.
Like this:
<form method="post" name="FrmEnquiry" id="FrmEnquiry" onsubmit=" return sendEnquiryform();" action="">
You can add the value where you want to send the post to.
Also refer to: https://www.w3schools.com/tags/att_form_action.asp

TEXTBOX REQUIRED POPUP [closed]

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How to I make a sweet alert error popup when form required textbox is empty and user clicked submit button. I want show instant popup danger alert that %This TextBox Is Required% in sweet alert. Such like JavaScript alert when textbox empty different is , that is js alert and I am talking about sweet alert instead of simple js alert. Please please help...

here is sweet alert if input text is empty
$('input[name="submit"]').on('click', function() {
if ($('input[name="fullname"]').val() == "") {
swal("fullname is required", '', 'error');
return false;
}
return true;
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
<form action="#" method="POST">
<input type="text" name="fullname">
<input type="submit" value="submit" name="submit">
</form>

you need to check here you use jquery trim and val function.
val: Get the current value of input
trim: Remove the whitespace from the beginning and end of a string.
$('#button').on('click', function(){
if($.trim($('input[type="text"]').val()) == ''){
swal("Input can not be left blank")
return false;
}
return true;
})
.swal-footer {
text-align:center !important;
}
.swal-button {
background-color: red;
}
.swal-button:focus {
outline: none;
box-shadow: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
<form action="#" method="POST">
<input type="text" name="fullname">
<input type="text" name="lastname">
<input type="submit" value="submit" id="button" name="submit"> </form>

how work activate function event onclick(or other function) when it is activated from browser? [closed]

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Some day ago i'd write for asking what was the problem about onclick event doesn't activate when i clicked in a specific area of the browser. After check a guide i find it the problem end also the rappresentation of my simply test is trivial, i've known the mechanism for activating a particular function in browser text area.
Now that work it... i'd want add more detail of my question...what is the mechanism that activate my function from template html to tag <script></script> ?
<h3> Check is palindrome</h3>
<input type="text" id="input1" >
<input type="text" id="input2">
<br><br>
<input type="button" id="reload" onclick="myFunction()" value="ricarica">
<body >
<p onclick="check()" id="output" style="line-height: 1000px"> TEST</p>
</body>
//WHAT IS THE MECHANISM IN THIS POINT FOR ACTIVATE check()?
<script>
function check() {
var x = document.getElementById("input1").value;
var y = document.getElementById("input2").value;
if(x===y){
document.getElementById("output").innerHTML=" E' PALINDROMA "
}else document.getElementById("output").innerHTML=" NON E' PALINDROMA "";
}
function myFunction() {
location.reload(true);
}
</script>
</html>

Everything about your code is wrong. Like... literally everything. Here's a suggested alternative:
var out = document.getElementById('output');
document.getElementById('input').oninput = function() {
if( this.value.split('').reverse().join('') === this.value) {
out.innerHTML = "The input is a palindrome!";
}
else {
out.innerHTML = "The input is not a palindrome...";
}
};
<input type="text" id="input" />
<p id="output">Type something...</p>

From what I understand, move your check() function to the input field
<input type="text" id="text1" onclick="check()">
and remove from body
<body>

whats wrong with getElementById [closed]

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I want that on pressing submit button, if the input was not correct(i.e. only letters) than warning(id="fn_warn") becomes vissible, but the code is not working. I think their is problem with getElementById.
Function isAlpha checks whether the value is letters only or not.
<!DOCTYPE HTML>
<head>
</head>
<body>
<form>
First name
<input id="first_name" type="text"/>
<p id="fn_warn" style=" visibility: hidden; color: red;">#Please enter a valid name...</p>
<input class="button" onclick="validate();" type="submit" value="Submit" />
<input class="button" type="reset" />
</form>
</body>
</html>
<script>
function validate(){
var submit=false;
var x = document.getElementById("first_name");
if (isAplha(x.value)){
submit=true;
} else {
var y = document.getElementById("fn_warn");
y.style.visibility = "visible";
}
}
function isAlpha(value){
if (value.match(/^[A-Za-z]+$/)){
return true;
} else {
return false;
}
}
</script>

I would recommend two things: fixing your typo for your first if statement that says isAplha instead of isAlpha and, if that doesn't fix it, checking your browser's console for errors, which is always a good idea when you're working with JS.

You have "isAphla(x.value)" instead of isAlpha

Javascript isn't working with Jquery and ajax [closed]

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<div class="RegisterFrame">
<form method="post" id="form" action="registeration.php" class="reg" enctype="multipart/form-data">
<input type="file" class="fileChooser" name="img">
<div class="uploadimg" name="imgUploader"><img src="" name='IDpic' class="IDpic"></div><br>
<text>Username</text><input type="text" class="textBox" name="user"><br>
<text>Password</text><input type="password" class="textBox" name="pass"><br>
<text>re-enter your password</text><input type="password" class="textBox" name="repass"><br>
<text>e-mail</text><input type="text" class="textBox" name="email"><br>
<text>re-enter your e-mail</text><input type="text" class="textBox" name="reemail"><br>
<button class="Con" type="submit">Done O.o</button><button class="Res" type="button">reset</button>
</form>
</div>
==========================================
Script code :
$("#form").submit(function(e) {
e.preventDefault();
// alert('test');
data = new FormData($('#form')[0]);
// console.log('Submitting');
$.ajax({
type: 'POST',
url: 'registeration.php',
data: data,
cache: false,
contentType: false,
processData: false,
success: function(result) {
alert(result);
//PS: the result gives the correct full path yet the image doesn't change
document.getElementsByClassName('.IDpic').src=result;
}
});
});

.getElementsByClassName('.IDpic').
I'm guessing the classname does not include a dot - this should be .getElementsByClassName('IDpic').
Also, since you are using jQuery, might as well do
$('.IDpic').attr('src', result);