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how to upload an image using ajax

I want to upload an image without refreshing the page,But my page still refresh when i hit submit button to upload image. what is wrong with my ajax code. This works when am submitting form with plain text but not with image file.
test.php
<div class="preview_d_p" id="preview_d_p">
<div class="preview">
<div class="p_preview">
<div id="p_p_image"><div id="myimage"></div></div>
</div>
<div id="lab"> <label for="photo_upload">upload</label></div>
<form enctype="multipart/form-data">
<input type="file" id="photo_upload" name="image_upload">
<input type="submit" value="save" id="insert_img" onclick="return loadimage()">
</form>
</div></div>
<script>
function loadimage(){
var image = documentElement('photo_upload').value;
$.ajax({
type:'post',
url:'profile.php',
data:{
image:image
},
cache:false,
success: function(html){
}
});
return false;
}
</script>

my advice is changing the input to a button (type="button") - I prefer buttons to inputs as they're more easily stylable.
But you can do something like this to govern submitting data without page refresh:
HTML EXAMPLE (NOT A COPY OF YOUR HTML):
<div id="container">
<form action="" method="post" id="myForm">
<input type="text" value="hello world!" />
</form>
<!-- what's great about buttons, is that you don't have to place inside the form tags -->
<button type="button" id="submitBtn">
JS To match
$(document).ready(function()
{
$('#submitBtn').on('click', function()
{
//ajaxy stuff
//will show the success callback function though:
success: function(res)
{
$('#container').html(res);
}
})
});
if your post script returns html then this should work. Let me know if otherwise :)

I solved this problem using formdata to send my image file to server
$(document).on("submit","form",function(e){
e.preventDefault();
var file = $("#product-file-i").val();
var p = $("#product-upload-f").children("input[name=name]").val();
$.ajax({
type:"post",
url:"profile.php",
data:new FormData(this),
contentType:false,
processData:false,
cache:false,
success: function(feedback){
alert(feedback);
},
error: function(){
}
});
});

php $POST[] empty after Ajax call from jquery

Form :
<form method="post" id="loginForm">
<div class="form-group">
<label for="email-signin">Email address:</label>
<input type="email" class="form-control" id="email-signin" name="email-signin">
</div>
<div class="form-group">
<label for="pwd-signin">Password:</label>
<input type="password" class="form-control" id="pwd-signin" name="pwd-signin">
</div>
<div class="checkbox">
<label>
<input type="checkbox"> Remember me</label>
</div>
<button type="submit" class="btn btn-default" id="signIn" name="signIn">Sign In</button>
<div id="error">
<!-- error will be shown here ! -->
</div>
</form>
jquery :
$("#signIn").on("click", function(e) {
e.preventDefault();
var values = $("#loginForm").serialize();
console.log( values );
$.ajax({
type: "POST",
url: "../php/BusinessLayer/User.php",
data: values,
beforeSend: function() { $("#error").fadeOut() },
success : function(response)
{
console.log("Success");
if(response=="ok"){
}
else{
$("#error").fadeIn(1000, function(){
$("#error").html('<div class="alert alert-danger"> <span class="glyphicon glyphicon-info-sign"></span> '+response+' !</div>');
});
}
}
});
php:
<?php
session_start();
include ("../DataLayer/VO/UserVO.php");
include ("../DataLayer/DAO/UserDAO.php");
// Database Execution for User Related Request
$userDAO = new UserDAO();
print_r($_POST);
if(isset($_POST['signIn']))
{
echo 'test2';
$user = new UserVO();
$user->setEmail(trim($_POST['email-signin']));
$user->setPassword(trim($_POST['pwd-signin']));
// Request signin
$userDAO->signIn($user);
}
Using this code, my if(isset($_REQUEST['signIn'])) in my php file never returns true. I have tried multiple things, and nothing seems to work.
PS : I am using Jquery 1.12.4
Also, my print_r($_POST); returns an empty Array.

jQuery's serialize function does not encode the values of buttons. Taken from here
NOTE: This answer was originally posted by slashingweapon
jQuery's serialize() is pretty explicit about NOT encoding buttons or submit inputs, because they aren't considered to be "successful controls". This is because the serialize() method has no way of knowing what button (if any!) was clicked.
I managed to get around the problem by catching the button click, serializing the form, and then tacking on the encoded name and value of the clicked button to the result.
$("button.positive").click(function (evt) {
evt.preventDefault();
var button = $(evt.target);
var result = button.parents('form').serialize()
+ '&'
+ encodeURIComponent(button.attr('name'))
+ '='
+ encodeURIComponent(button.attr('value'))
;
console.log(result);
});
As far as the var dump being empty on the PHP side, try using jQuery's .click instead of the .on event.
$('#signIn').click(function(){});
Also, remove the method from your form. It looks like the form may be submitting as soon as you click the button. Also, remove
e.preventDefault();
and place
return false;
at the VERY END of the on click function. return false does 3 things
e.preventDefault()
e.stopPropigation();
return immdediatly

Reload a single DIV on a page using onClick

In my page there are several DIVs, which are supposed to show different news items depending on the user selection and a press of a submit button.
Am I able to refresh only a single DIV when the relevant submit button is clicked?
I tried <input type ="button"> instead of <input type="submit"> but that didn't work as expected. My code is below:
<div class="dloader"></div>
<div class="search">
<form action="" method="post">
Furniture:
<input type="text" name="val1" id="val1" value="<?=$_POST['val1']?>" />
<input type="submit" value="Submit" name="submit" />
</form>
</div>
<?php
if( isset($_POST['submit']) ){
$postItemHeader = htmlentities($_POST['val1']);
}?>
<script>
$(window).load(function() {
$(".dloader").fadeOut("slow");
})
</script>

Take One Button For Post Event
<input type="submit" id="add" name="add" />
If You want to pass the Text Data, so a text value from the Text to fetch the particular data
<div id="result">Result should appear here</div>
Use Javascript To POst The Text Data To Back End
$(document.ready(function() {
$("#add").click(function(e) {
e.preventDefault();
$.ajax({
url: 'test.php',
type: 'POST',
data: $('#add').val,
success: function(data, status) {
$("#result").html(data)
}
});
});
});

What you need is AJAX. (read the documentation). A simple example is here.
The HTML
<div id="target_div"></div> <!-- Here is where you gonna place your new content -->
<input type='button' id='trigger' onClick="get_new_data()" value="Get new Content"> <!-- When this button is pressed get new content -->
The Javascript
function get_new_data()
{
$.ajax(
{
type: POST,
url: "you-url-here.php",
dataType:"HTML", // May be HTML or JSON as your wish
success: function(data)
{
$('div#target_div').html(data) // The server's response is now placed inside your target div
},
error: function()
{
alert("Failed to get data.");
}
}); // Ajax close
return false; // So the button click does not refresh the page
} // Function end

After new elements has been injected run JQuery

I been looking for the way to do this since yesterday, I have a <div class="list"> where I append some element using PHP
HTML:
<div id="list"></div>
<input type="button" value="Populate" onClick="populate();">
Javascript
function populate(){
var url = 'http://mylink.com/edit.php?region_name='+region_name;
$.ajax({
type: "GET",
url: url,
success:function(results){
$('#list').html(results);
}
});
}
Then my generated HTML after running clicking on the button is;
<div id="list">
<label>region</label>
<br>
<div class="edit">
<input class="num" type="text" value="east" readonly="">
</div>
</div>
As it is not in a right structure, I want to run a JQuery after the elements has been populated
var length = $('.edit').length;
for(var a = 0; a <= length - 1; a++){
$('.edit:eq('+ a +')').find('input').appendTo($('label:eq('+ a +')'));
Fiddle sample here.
And BTW, I tried to bind it with DOMSubTreeModified
$("#List").bind("DOMSubtreeModified", function() {
//My JQuery
});
But still no result.

Try this one
call your js function in done block
$.ajax({
url: "test.html",
}).done(function() {
//your jquery method
});

How to add before send function to current return ajax function?

i have a main form on my main page, the form get an email address from the user and check if the email exist.
My target is to show the results on the same page with bootstrap collapse.
I am using this code in the javascript side:
$(".emailCheckForm").bind("submit", function () {
return $.ajax({
type: "POST",
width: "auto",
height: "auto",
padding: 10,
cache: !1,
url: "_/php/checkemail.php",
data: $(this).serializeArray(),
success: function (t) {
$(".res").append(t).collapse();
},beforeSend: function(){
$( "#message" ).empty();
}
}), !1
}),
my html code:
<form action="" method="post" class="col-md-8 centered emailCheckForm">
<div class="input-group">
<input type="email" name="email" class="form-control checkFrame" placeholder="you#youremail.com">
<div class="input-group-btn">
<input type="submit" value="answer me!" class="btn btn-default checkFrame" tabindex="-1" />
</div>
</div><!-- /.input-group -->
</form>
<div class="res"></div>
Now this working but the problem is that if i want to check another email i get the same results until i will refresh the page.
So i want to implement a before send function that will remove\empty the div results.
I cant make this happen because that every time that i insert the beforsesend function the post not working, any suggestions to make proccess like that in the right way?

How about this one. On every successful callback it will clean up results from previous request and re-populate latest:
...
success: function (t) {
$(".res").empty().append(t).collapse();
}
...