AJAX logic not working - javascript
I am new to AJAX and learning it. I am searching a food item in my HTML textbox and trying to communicate with the server to know if the item is available. The respective status of the item should be shown in the div tag below the textbox but it is not showing.
I haven't studied jQuery yet and would like to know the below things:
How to get the response from the server in plaintext using AJAX and JavaScript, and display it in the div tag below the textbox (advise the changes to be made in the code).
What change should I make in JavaScript code to send the AJAX request in POST method (I know about the changes in PHP code)?
//index.html
<head>
<script type="text/javascript" src="food.js">
</script>
</head>
<body>
<h3>The Cheff's Place</h3>
Enter the food you want to order
<input type="text" id="userInput" name="input" onkeypress="sendInfo()"></input>
<div id="underInput"></div>
</body>
</html>
//food.js
var request;
function sendInfo() {
var v = document.getElementById("userInput").value;
var url = "index.php?food=" + v;
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
} else if (window.ActiveXObject) {
request = new ActiveXObject("Microsoft.XMLHTTP");
}
if (request.readyState == 0 || request.readyState == 4) {
try {
request.onreadystatechange = getInfo;
request.open("GET", url, true);
request.send(null);
} catch (e) {
alert("Unable to connect to server");
}
}
}
function getInfo() {
if (request.readyState == 4) {
if (request.status == 200) {
var val = request.responseText;
document.getElementById('underInput').innerHTML = val;
}
}
}
//index.php
<?php
header('Content-Type: text/plain');
$food = $_GET['food'];
$foodArray = array("paneer", "butter", "chicken", "tandoori", "dal");
if (in_array($food, $foodArray))
{
echo "We do have " .$food;
}
elseif($food == "")
{
echo "Kindly enter some food";
}
else
{
echo "We do not sell " .$food;
}
?>
I ran your code. It's working fine. Just replace onkeypress with onkeyup.
<input type="text" id="userInput" name="input" onkeyup="sendInfo()"></input>
Using JQuery (Assuming you have included jquery file or cdn) :
Include the following snippet in script tag at the end of the body.
$("#userInput").keyup(function(){
$.get("index.php", { food: $("#userInput").val() })
.done(function(data) {
$("#underInput").html(data)
})
});
Related
Do a javascript redirect after an ajax call
I'm trying to use ajax to parse data to be processed on a php page and have php echo a javascript redirect to another page but it is not working. I have read that js does not work after running an ajax call so I will like to know if there s a way around it. This is my code:
html
<form>
<div class="depart_time bottom_white w-40 ml-auto">
<p>Time</p>
<input type="time" name = "return_time" id = "rt">
</div>
<div class = "search_button r_search">
<button id = "r_search" onclick = "return false" onmousedown = "rent()">SEARCH</button>
</div>
</form>
ajax call is a normal xhttp request that gets sent to php for processing after which a redirection should occur:
if(isset($_POST['return_time'])){
echo '<script type="text/javascript">window.location.href="link.html"</script>';
}
Please an help is appreciated. I'm new to using ajax.
EDIT
the ajax code:
gid("r_search").addEventListener("mousedown", rent);
function rent(){
rt = gid('rt').value;
r_search = gid('r_search').value;
form_array = '&rt=' + rt +
'&r_search=' + r_search;
send_data = form_array;
ajax_data('app/rent.php', 'error', send_data);
//gid('error').innerHTML = send_data;
}
function ajax_data(php_file, getId, send_data){
gid(getId).innerHTML = "loading";
var xhttpReq = new XMLHttpRequest();
xhttpReq.open("POST", php_file, true);
xhttpReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttpReq.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
gid(getId).innerHTML = xhttpReq.responseText;
}
};
xhttpReq.send(send_data);
}
please note that 'gid' is for getelementbyid
You have to make bit alteration to your way of redirection.
First you need to make changes in your PHP response
if(isset($_POST['return_time'])){
...
// If you get your process success return 1
if(success) {
echo 1; die();
} else {
// else set some flag that you could get on your AJAX response
echo 0; die();
}
}
Now, get this flag on your AJAX and make changes to your below functions:
function ajax_data(php_file, getId, send_data){
gid(getId).innerHTML = "loading";
var xhttpReq = new XMLHttpRequest();
xhttpReq.open("POST", php_file, true);
xhttpReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttpReq.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
if( xhttpReq.responseText == 1 ) window.location.href="URL where you wish to redirect page";
}
};
xhttpReq.send(send_data);
}
I've written this answer for others who come here for help.
Ajax To PHP converter get value from ajax
i need help, here my code :
<html>
<head>
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "getstok.php?secretkey=123&sku=" + str, true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<p><b>Masukkan kode barang / SKU:</b></p>
<form>
Kode Barang: <input type="text" onkeyup="showHint(this.value)">
</form>
<div id="txtHint"></span>
</body>
</html>
What I need is:
I want to hide this "secretkey=123" so visitor cannot see my secret key
when call "xmlhttp.send();" return the value and I want to convert it to php like example
$getxmlhttp = xmlhttp.send();
when I type something it will be call function, but when I press enter that refresh, how to disable the enter or what the best suggestion for me.
this is my site sample:
http://stok.tk
for example type "YI 067"
1 : You can't. The browser (and so the visitor) can always know wich page is called with wich URL and parameters 2 : You can't do it like that. You need to get the value of your request into getstok.php with the super global variables $_GET['your var'] 3 : It's reloading the page because it's sending your form. By default it send it to the same page. Just remove your <form>
How to delay the java script keyup() handler when user clear text field
I'm using JavaScript keyup() event for a single text box. If someone types “Windows”, it will send an HTTP request for every keyup: “W”, “Wi”, “Win”, “Wind”, “Windo”, “Window”, “Windows” This is the desired behaviour. When the user clears the text box empty, it gives an error. This is the undesired behaviour. Question How can I stop an HTTP request being sent when the text box is cleared?
You can use AJAX to send information to the server (and get information for that matter):
<?php
if (isset($_POST['search'])) {
echo json_encode($_POST);
die();
}
?>
<form>
<input id="search" type="text" name="search" />
</form>
<script>
document.getElementById("search").addEventListener('keyup', function (e) {
var xhr = new XMLHttpRequest();
xhr.open("POST", "#", true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function () {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.readyState == 4 && xhr.status == 200) {
object = JSON.parse(xhr.responseText);
console.log(object);
}
}
}
xhr.send("search=" + this.value);
});
</script>
Check the value before making request
function getResult(elem) {
if (elem.value !== '') {
console.log('Have values')
} else {
console.log('No values')
}
}
<input type="text" onkeyup="getResult(this)">
why php results in HTML are undefined when using JavaScript
I need to get the IP of the client. I am able to get it through PHP variable
"$_SERVER['REMOTE_ADDR']". I get this ip from server side php to html page through AJAX request but when I want to use this IP value in JavaScript it is showing that the value is undefined.
any solution?
PHP code:
<?php echo $_SERVER['REMOTE_ADDR'];?>
HTML CODE:
<body onload='ip(); ip2();'>
<kbd id='ip' ></kbd>
JavaScript code:
function ip() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("ip").innerHTML =
this.responseText;
}
};
xhttp.open("POST", "ip.php");
xhttp.send();
}
function ip2() {
setTimeout(function () {
var ip = document.getElementById("ip").value;
alert(ip);
}, 1000);
}
First of all you should validate that you are getting the right response from your AJAX request by check that the result is certainly written to the element with id attribute "ip", and than instead of using:
var ip = document.getElementById('ip').value;
You should use Node.textContent to get the text content:
var ip = document.getElementById('ip').textContent;
Code example (without AJAX request):
function ip() {
document.getElementById('ip').innerHTML = '127.0.0.1';
}
function ip2() {
setTimeout(function () {
var ip = document.getElementById('ip').textContent;
console.log(ip);
}, 1000);
}
<body onload="ip(); ip2();">
<kbd id="ip" ></kbd>
You want your Ip Address in java script , so have to put ip address in that tag i think. <?php $ip_address = $_SERVER['REMOTE_ADDR'];?> <body onload='ip(); ip2();'> <kbd id='ip' ><?php echo $ip_address; ?></kbd>
<?php echo $_SERVER['REMOTE_ADDR'];?>
<html>
<head>
</head>
<body onload='ip();'>
<div id='ip' ></div>
</body>
</html>
<script>
function ip() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("ip").innerHTML =
this.responseText;
ip2(this.responseText);
}
};
xhttp.open("POST", "try.php");
xhttp.send();
}
function ip2(stringvalue) {
setTimeout(
function() {
var ip = document.getElementById("ip").value;
alert(stringvalue);
},2000);
}
</script>
run this code you might found what is the problem.
Auto Link shorting via PHP&AJAX (bit.ly)
I would like to build a form (VIA POST METHOD) with just one field (url - link shortening). Now the question is how and if is it possible to build a form that detects the value of the URL field is a link and automatically shortens it rather than waiting you click Send (for exmaple like the web of Bit.ly).
The main idea is once the field is an identifier that value is a proper Hyperlink is directly sends and shortens (And the field is replaced by a shortened link) it without waiting for the click on the SEND.
index.html
<html>
<head>
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "gethint.php?q=" + str, true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<p><b>Start typing a url in the input field below:</b></p>
<form>
Url: <input type="text" onkeyup="showHint(this.value)">
</form>
<p><span id="txtHint"></span></p>
</body>
</html>
gethint.php
<?php
// get the q parameter from URL
$q = $_REQUEST["q"];
$hint = "";
if (!filter_var($q, FILTER_VALIDATE_URL) === FALSE) {
// short the link
$rand = rand(1,1000);
$hint = 'http://domain.com/'.$rand; }
echo $hint === "" ? "Not a valid URL" : $hint; ?>
I'd use jQuery for the event triggering/AJAX and https://gist.github.com/dperini/729294 for weburl regex.
I'm not that at home on pure JavaScript AJAX calls, but is
xmlhttp.open("GET")
the right way to go at it if you want to make a POST?
Anyway the main thing you're missing is
function isUrl(url){
var regex = /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?#)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i;
if(regex.test(url)){
return regex.test(url);
}else{
return regex.test("http://"+url);
}
}
So this should be your new index.html
<html>
<head>
<script>
var extensions = [".aero",".biz",".cat",".com",".coop",".edu",".gov",".info",".int",".jobs",".mil",".mobi",".museum",".name",".net",".org",".travel",".ac",".ad",".ae",".af",".ag",".ai",".al",".am",".an",".ao",".aq",".ar",".as",".at",".au",".aw",".az",".ba",".bb",".bd",".be",".bf",".bg",".bh",".bi",".bj",".bm",".bn",".bo",".br",".bs",".bt",".bv",".bw",".by",".bz",".ca",".cc",".cd",".cf",".cg",".ch",".ci",".ck",".cl",".cm",".cn",".co",".cr",".cs",".cu",".cv",".cx",".cy",".cz",".de",".dj",".dk",".dm",".do",".dz",".ec",".ee",".eg",".eh",".er",".es",".et",".eu",".fi",".fj",".fk",".fm",".fo",".fr",".ga",".gb",".gd",".ge",".gf",".gg",".gh",".gi",".gl",".gm",".gn",".gp",".gq",".gr",".gs",".gt",".gu",".gw",".gy",".hk",".hm",".hn",".hr",".ht",".hu",".id",".ie",".il",".im",".in",".io",".iq",".ir",".is",".it",".je",".jm",".jo",".jp",".ke",".kg",".kh",".ki",".km",".kn",".kp",".kr",".kw",".ky",".kz",".la",".lb",".lc",".li",".lk",".lr",".ls",".lt",".lu",".lv",".ly",".ma",".mc",".md",".mg",".mh",".mk",".ml",".mm",".mn",".mo",".mp",".mq",".mr",".ms",".mt",".mu",".mv",".mw",".mx",".my",".mz",".na",".nc",".ne",".nf",".ng",".ni",".nl",".no",".np",".nr",".nu",".nz",".om",".pa",".pe",".pf",".pg",".ph",".pk",".pl",".pm",".pn",".pr",".ps",".pt",".pw",".py",".qa",".re",".ro",".ru",".rw",".sa",".sb",".sc",".sd",".se",".sg",".sh",".si",".sj",".sk",".sl",".sm",".sn",".so",".sr",".st",".su",".sv",".sy",".sz",".tc",".td",".tf",".tg",".th",".tj",".tk",".tm",".tn",".to",".tp",".tr",".tt",".tv",".tw",".tz",".ua",".ug",".uk",".um",".us",".uy",".uz", ".va",".vc",".ve",".vg",".vi",".vn",".vu",".wf",".ws",".ye",".yt",".yu",".za",".zm",".zr",".zw"];
var delay = (function(){
var timer = 0;
return function(callback, ms){
clearTimeout (timer);
timer = setTimeout(callback, ms);
};
})();
function isUrl(url){
var regex = /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?#)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i;
if(regex.test(url)){
return regex.test(url);
}else{
return regex.test("http://"+url);
}
}
function showHint(str) {
delay(function(){
str = str.toLowerCase();
var dot = str.lastIndexOf(".");
var extension = str.substr(dot);
extension = extension.split('/')[0];
var found = $.inArray(extension, extensions) > -1;
if (!isUrl(str)||!found) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "gethint.php?q=" + str, true);
xmlhttp.send();
}
}, 500)
}
</script>
</head>
<body>
<p><b>Start typing a url in the input field below:</b></p>
<form>
Url: <input type="text" onkeyup="showHint(this.value)">
</form>
<p><span id="txtHint"></span></p>
</body>
</html>
edit: Say you will start typing in http://www.example.net.. The AJAX will trigger on "http://www.example.ne" and then again when you add the last letter. To avoid that, you might try "change" instead of "keyup" event.
edit2: Now checks against list of valid domain extensions
edit3: Now waits half a second before posting the result.
edit4: Small oversight while checking for extensions, fixed with
extension = extension.split('/')[0];
Also if you want to enable users to write URL's without "http://" and similar, you'll need an edited regex or write a small hack that adds that to your string before you send it into "isUrl()".