using ajax from a php function - php

Question

I am new with ajax. I have this php function already from functions.php
function checkUserEmailExistent($email){
...
return $boolean;
}
and this is for my views views.html
<input type='text' name='email' id='email'>
this is for the script.js
jQuery( "#email" ).blur(function() {
jQuery.ajax({
type: 'POST',
url: 'url',
dataType: 'json',
data: { 'value' : $(this).val() },
success : function(result){
}
});
});
my issue is how can I call my php function in ajax to connect it to my html. when it blur it check the email value if it is exist or not.

Answer 1

work in WordPress
JS SCRIPT
jQuery( "#email" ).blur(function() {
jQuery.ajax(
{
url: ajax_url,
type: "POST",
dataType: "json",
data: {
action: 'checkUserEmailExistent',
email: $(this).val(),
},
async: false,
success: function (data)
{
if (data.validation == 'true')
jQuery('.email-massage').html('<div class="alert alert-success">×<strong>Success!</strong> successfully</div>');
else
jQuery('.email-massage').html('<div class="alert alert-danger">×<strong>Oops!</strong> Something went wrong.</div>');
},
error: function (jqXHR, textStatus, errorThrown)
{
jQuery('.email-massage').html('<div class="alert alert-danger">×<strong>Oops!</strong> Something went wrong.</div>');
}
});
});
WP SCRIPT in functions.php
add_action('wp_ajax_checkUserEmailExistent', 'checkUserEmailExistent');
add_action('wp_ajax_nopriv_checkUserEmailExistent', 'checkUserEmailExistent');
function checkUserEmailExistent() {
$email = $_POST['email']; // get email val
/*if() your condition
$email = 1;
else
$email = 0;
*/
if ($email == 1):
$email_val= 'true';
else:
$email_val = 'false';
endif;
echo json_encode(array("validation" => $email_val));
die;
}
in function.php Enqueue file after add this code like this
wp_enqueue_script('themeslug-default', get_template_directory_uri() . '/js/default.js', array('jquery'));
wp_localize_script('themeslug-default', 'ajax_url', admin_url('admin-ajax.php'));

Answer 2

Set url to the php file where you have checkUserEmailExistent function. Then:
function checkUserEmailExistent($email){
...
return $boolean;
}
return checkUserEmailExistent($_REQUEST['value']);

Answer 3

I give the example for validation.This will help you to check
Email id<input type="text" name="email" id="email" size=18 maxlength=50 onblur="javascript:myFunction(this.value)">
You need to add the script
<script>
function myFunction(em) {
if(em!='')
{
var x = document.getElementById("email").value;
var atpos = x.indexOf("#");
var dotpos = x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length) {
alert("Not a valid e-mail address");
document.getElementById("email").value = "";
return false;
exit();
}
var email=$("#email").val();
$.ajax({
type:'post',
url:'email_client.php',
data:{email: email},
success:function(msg){
if (msg.length> 0) {
alert(msg);
document.getElementById("email").value = "";
}
}
});
} }
</script>
Create a page 'email_client.php' and add the code
<?php
$s=$_POST['email'];
include "config.php";
$echeck="select email from client where active=0 and email='".$_POST['email']."'"; //change your query as you needed
$echk=mysql_query($echeck);
$ecount=mysql_num_rows($echk);
if($ecount>='1' && $s!='0')
{
echo "Email already exists";
}
?>

Answer 4

You would call it in your url parameter. However, you'll need to manage your AJAX handler in the PHP script.
AJAX
jQuery( "#email" ).blur(function() {
jQuery.ajax({
type: 'POST',
url: 'functions.php',
dataType: 'json',
data: { 'value' : $(this).val() },
success : function(result){
if (result.success) {
//handle success//
} else if (result.failure) {
//handle failure//
}
}
});
});
PHP
function checkUserEmailExistent($email){
...
return $boolean;
}
if ($_POST['value']) {
$status = checkUserEmailExistent($email);
if ($status === true) {
echo json_encode (array('status' => 'success'));
} elseif ($status === false) {
echo json_encode (array('status' => 'failure'));
}
}

Answer 5

you don't call your server function inside Ajax you only send your data in JSON format to the server on getting this data,server will route(if MVC) it to specific function and return a response to client in JSON format so now inside Ajax you perform operation on success (what to do next ) and in case of failure show the error
How server will route it to specific function that depend on framework you use, but i think they simply use regexp to match with URL