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How can I Pass String from MVC to Javascript to Execute using Ajax

public ActionResult GiveTicket(Guid voteId, Guid applyId,string cptcha)
{
//檢查此票選是否允許此登入方式
var canVoteWay = _voteService.GetVoteWay(voteId);
string message = string.Empty;
string loginPath = $"{ConfigurationManager.AppSettings["DomainName"]}/Account/Login?returnUrl={Request.UrlReferrer}";
//檢查是否已登入
if (User.Identity.IsAuthenticated && WebLogic.HasValue(canVoteWay, (int)CurrentUser.LoginType))
{
// [驗證圖形驗證碼]
if (string.IsNullOrEmpty(cptcha) || cptcha != Session["VerificationCode"]?.ToString())
{
Response.Write("<script language=javascript> bootbox.alert('圖形驗證碼驗證錯誤，請重新輸入!!')</script>");
return null;
}
//var result = _voteService.GiveTicket(voteId, applyId, CurrentUser.Id, CurrentUser.LoginType);
Response.Write("<script language=javascript> bootbox.alert('投票成功')</script>");
return null;
}
message = _voteService.VoteWayString(canVoteWay, "請先登入，才能參與投票!! 投票允許登入的方式:");
Response.Write("<script language=javascript> if (confirm('" + message + "',callback:function(){})){window.location = '" + loginPath + "'}</script>");
return null;
}
My ajax code
function GiveTicket(applyId) {
var voteId = $('input[name="Id"]').val();
var captcha = $('input[name="Captcha"]').val();
$.ajax({
url: '#Url.Action("GiveTicket", "Vote")',
data: { applyId: applyId, voteId: voteId, cptcha: captcha },
type: 'Get',
success: function (data) {
console.log(data);
//bootbox.alert(data);
}
});
}
Like you see. I have many condition. SomeTime I need to pass alert or confirm to
web client . when I pass confirm. if user click Yes. I need to redirect Url.
So that I decide to write string to web client.
The problem is How I can just execute string from MVC like alert,confirm...

hello hopefully this post help you
you can passe your string to view using viewbag or viewModel as you like then in this view you put your redirect logic using razor.

Trigger a php script using ajax - how and where to program this?

Good day,
I have a php file (db.php) which contains the following function
function edit_record($id, $value){
if($this->db->query('UPDATE tbl_prototype SET value = ' . $value .' WHERE id_component = '.$id)){
$this->register_changes();
return TRUE;
}
return FALSE;
}
Besides, I have some checkboxes in my html page as follows :
<input id="chk01" type="checkbox" data-onstyle="success" data-toggle="toggle">
<input id="chk02" type="checkbox" data-onstyle="success" data-toggle="toggle">
the html page contains also the following script.
<script>
/* AJAX request to checker */
function check(){
$.ajax({
type: 'POST',
url: 'checker.php',
dataType: 'json',
data: {
counter:$('#message-list').data('counter')
}
}).done(function( response ) {
/* check if with response we got a new update */
if(response.update==true){
var j = response.news;
$('#message-list').html(response.news);
sayHello(j);
}
});
};
//Every 1/2 sec check if there is new update
setInterval(check,500);
</script>
<script>
function sayHello(j){
var json=$.parseJSON(j);
var techname = "";
var techname1 = "";
var c;
var w;
$(json).each(function(i,val){
$.each(val,function(k,v){
if (k=="tech_name")
{
techname = "#" + v;
techname1 = v;
}
else
{
console.log("Mon nom est " + techname + " et ma valeur est " + v);
c=document.getElementById(techname1);
if (c.checked)
{
w = 1;
}
else
{
w = 0;
}
console.log(w);
console.log("techname : " + techname1);
if (v != w)
{
console.log ("Pas identique");
if (v==0)
{
// false
uncheckBox(techname);
}
else
{
// true
checkBox(techname);
}
}
else
{
console.log ("Identique");
}
}
});
});
}
function checkBox(pCtrl)
{
toggleOn(pCtrl);
}
function uncheckBox(pCtrl)
{
toggleOff(pCtrl);
}
</script>
Now for my question: where and how should I specify that I would like to run the function 'edit_record' stored in the 'db.php' file with the two parameters ($id and $value).
Contents of 'checker.php' :
<?php require('common.php');
//get current counter
$data['current'] = (int)$db->check_changes();
//set initial value of update to false
$data['update'] = false;
//check if it's ajax call with POST containing current (for user) counter;
//and check if that counter is diffrent from the one in database
//if(isset($_POST) && !empty($_POST['counter']) && (int)$_POST['counter']!=$data['current']){
if(isset($_POST)){
$data['news'] = $db->get_news2();
$data['update'] = true;
}
//just echo as JSON
echo json_encode($data);
/* End of file checker.php */
Thanks a lot for your valuable inputs. Sorry if the question sounds silly (I'm a newbie in php/ajax/jquery programming).

In modern web apps with rich interface You should go for REST API and create controller which should be in You case in checker.php. Example ( checker.php ):
if ($_SERVER['REQUEST_METHOD'] == 'POST'){
//update code
edit_record($_POST['id'],$_POST['counter]);
}
if ($_SERVER['REQUEST_METHOD'] == 'GET'){
//get code
}
ps. i do not see passing id in ajax, you send only counter, so you should add id like:
...
data: {
id:yourId //here your id
counter:$('#message-list').data('counter')
}
Next thing remove from js:
setInterval(check,500);
and create bind:
$("yourcheckboxselector").on("click",function(e){
check($(this).prop("checked") ) //here you have it was checked or not as boolean
});

How to retrieve a php form with AJAX at specific time spans

I want to display a form with a script I adapted from this question. The script is in a file I wrote called queries.js, and its purpose is to print the content of a php form called "dbMinAlert.php" in a div like this <div id="recentExits" name="recentExits"></div> located in my project's index, I tried invoking getNewData(); in my index.php file using this tag <body onLoad="getNewData()"> but it doesn't seem to do anything at all.
var data_array = ''; // this is a global variable
function getNewData() {
$.ajax({
url: "dbMinAlert.php",
})
.done(function(res) {
data_array = res; // the global variable is updated here and accessible elsewhere
getNewDataSuccess();
})
.fail(function() {
// handle errors here
})
.always(function() {
// we've completed the call and updated the global variable, so set a timeout to make the call again
setTimeout(getNewData, 2000);
});
}
function getNewDataSuccess() {
//console.log(data_array);
document.getElementById("recentExits").innerHTML=data_array;
}
getNewData();`
---This php code works and it actually does what I expect it to do. The real problem is the javascript, for all I care the next php form could print a "Hello world" message, but I want it displayed inside the div I placed in my index, without having to post a thing to dbMinAlert.php.
define("HOST", "localhost");
define("DBUSER", "root");
define("PASS", "password");
define("DB", "mydb");
// Database Error - User Message
define("DB_MSG_ERROR", 'Could not connect!<br />Please contact the site\'s administrator.');
$conn = mysql_connect(HOST, DBUSER, PASS) or die(DB_MSG_ERROR);
$db = mysql_select_db(DB) or die(DB_MSG_ERROR);
$query = mysql_query("
SELECT *
FROM outputs, products
WHERE products.idProduct=outputs.idProduct
ORDER BY Date DESC, Time DESC limit 5
");
echo '<ul class="news">';
while ($data = mysql_fetch_array($query)) {
$date = date_create($data['Date']);
$time = date_create($data['Time']);
echo '<li><figure><strong>'.date_format($date,'d').'</strong>'.date_format($date,'M').date_format($date,'Y').'</figure>'.$data["idProduct"]." ".$data['prodName'].'</li>';
}
echo '</ul>';

You have to execute the function for the first time.
getNewData();

It could be the way you are returning the result from php. Instead of doing multiple echo, could you first assign your result in single php variable and finally do single echo.
$result = '<ul class="news">';
while ($data = mysql_fetch_array($query)) {
$date = date_create($data['Date']);
$time = date_create($data['Time']);
$result = $result + '<li><figure><strong>'.date_format($date,'d').'</strong>'.date_format($date,'M').date_format($date,'Y').'</figure>'.$data["idProduct"]." ".$data['prodName'].'</li>';}
$result = $result + '</ul>';
echo $result;

I found a solution in this question and my code ended up Like this.
I just had to invoke the function in my index by typing <body onload="return getOutput();">
JavaScript
//Min-Max Alerts
// handles the click event for link 1, sends the query
function getOutput() {
getRequest(
'dbMinAlert.php', // URL for the PHP file
drawOutput, // handle successful request
drawError // handle error
);
return false;
}
// handles drawing an error message
function drawError() {
var container = document.getElementById('recentExits');
container.innerHTML = 'Bummer: there was an error!';
}
// handles the response, adds the html
function drawOutput(responseText) {
var container = document.getElementById('recentExits');
container.innerHTML = responseText;
}
// helper function for cross-browser request object
function getRequest(url, success, error) {
var req = false;
try{
// most browsers
req = new XMLHttpRequest();
} catch (e){
// IE
try{
req = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
// try an older version
try{
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
return false;
}
}
}
if (!req) return false;
if (typeof success != 'function') success = function () {};
if (typeof error!= 'function') error = function () {};
req.onreadystatechange = function(){
if(req.readyState == 4) {
return req.status === 200 ?
success(req.responseText) : error(req.status);
}
}
req.open("GET", url, true);
req.send(null);
return req;
}

Return value from php to javascript

I writing a registration/login form, I am sending user info via POST to a PHP that is looking in a DB. I would like that the PHP returns an ok or wrong value to the js and I don't now how to do it.
Here my js:
ui.onClick_regsubmit=function()
{
var fname=document.getElementById('fname').value;
var lname=document.getElementById('lname').value;
var password=document.getElementById('password').value;
var mail=document.getElementById('mail').value;
var affiliation=document.getElementById('affiliation').value;
var data = new FormData();
var xhr = (window.XMLHttpRequest) ? new XMLHttpRequest() : new activeXObject("Microsoft.XMLHTTP");
data.append("fname",fname);
data.append("lname",lname);
data.append("password",password);
data.append("mail",mail);
data.append("affiliation",affiliation);
xhr.open( 'post', 'PHP/registration.php', false );
xhr.send(data);
window.alert(affiliation);
}
And the php:
<?php
mysql_connect('localhost','root','') or die('Cannot connect mysql server');
mysql_select_db('ChemAlive_login') or die('cannot connect database');
$lname=$_POST['lname'];
$fname=$_POST['fname'];
$password=$_POST['password'];
$mail=$_POST['mail'];
$affiliation=$_POST['affiliation'];
$q=mysql_query("select * from login where mail='".$mail."' ") or die(mysql_error());
$n=mysql_fetch_row($q);
if($n>0)
{
$q=mysql_query("select password from login where mail='".$mail."' ");
$pp=mysql_fetch_row($q);
if($pp[0]=$password) echo "ok";
else echo "wrong";
}
else
{ $insert=mysql_query("insert into login values('".$fname."','".$lname."','".$mail."','".$password."','".$affiliation."')") or die(mysql_error());}
?>
I would like to return to js this ok or wrong value. How to do it?

xhr.onload=function()
{
if (xhr.status==200)
{
alert(xhr.response);
}else
{
alert("unknown server error");
}
}
it will be better if the server sends a response code, and javascript will transfer this code to the text. For example:
onload=function()
{
switch(xhr.response)
{
case "0":{alert("unknown error")};break;
case "1":{alert("email is already used")};break;
...
}
}
I think thought it is clear

I do not have the rep to comment or I'd ask for details, but if you can consider using ajax, it could look something like this:
php:
$doit = //your query;
if($doit){
$youdid = 'ok';
}
else{
exit('1');
}
js:
$(document).ready(function () {
var foo = $("#formfield")val();
$.ajax({
"foo":foo;
type: 'POST',
url: 'some.php',
success: function(responseText) {
if(responseText == "1") {
alert("Leave instantly");
};
}
else {
alert("One of us");
}

If you want to return either ok or wrong to the JavaScript to handle you could do something like this in your registration.php page:
$q=mysql_query("select password from login where mail='".$mail."' ");
$pp=mysql_fetch_row($q);
if($pp[0]=$password){
header('Content-Type: application/json');
echo json_encode(array('password' => 'ok'));
}else{
header('Content-Type: application/json');
echo json_encode(array('password' => 'wrong'));
}
I have not fully testing this, but the idea is to set the header to return json and then send it a JSON string.
Does that make sense?
Like I said in my comment below I have only used jQuery for AJAX. But here is a little something of what I know about XMLHttpRequest and my undertsanding of how you would test what you get back.
You can set up a listener for when you get a response back onreadystatechange and then put the response in a variable var pass = xhr.response and then just output the text to an alert box like alert(pass.password).
if (xhr.onreadystatechange === 4 && xhr.status === 200){
var pass = xhr.response;
//should output either ok or wrong
alert(pass.password);
}
Read more about XMLHttpRequest here
Let me know if that works.

Error when search a file in CodeIgniter

I have an error when I have tried search a file get from url. I want to search a file in directory it will match with the value get from url if matched controller will return value 'ok' to browser. But I can not see anything appear in my browser.
jquery transmit url to server
var qr_download = function(e){
var img = $('#display').attr('src');
if(img == ''){
alert('Generate a code first!');
return;
}else{
var fn = img.substr(img.lastIndexOf('/')+1,img.length-img.lastIndexOf('/'));
$.ajax({
url: 'download_file/' + fn,
dataType: 'json',
success: function(data){
if(data.error)
alert('Error: ' + data.error);
if(data.success)
alert('Success: ' + data.success);
}
});
return false;
}
my controller
public function download_file($filename){
$this->load->helper('download');
$ext = substr(strrchr($filename,'.'),1);
$list = array();
if(in_array($ext,array('png','jpg','jpeg'))){
$files = scandir('temp/');
for($i=0;$i<count($files);$i++){
if(is_file($files[$i]) && !in_array($files[$i],array('.','..'))){
if($files[$i] == $filename){
//$content = file_get_contents(base_url().'temp/'.$files[$i]);
//force_download($files[$i],$content);
$this->result['success'] = 'ok';
exit();
}
}
}//end for
}else{
$this->result['error'] = 'Not allowed file type';
}
echo json_encode($this->result);
}
Please help me resolve it. Thanks.