Develop Reference

how to send very long data in ajax url?

i am using php and ajax together to access data from user and insert into database.problem is that it works fine with small string but when i try to send data on 10000 characters browser prompts an error saying url to long.. i can make change in php but i want it to be dynamic so i have to it using this way only.. help me plz.
function submitQuestion(){
var x=document.forms['Ask']['title'].value;
var y=document.forms['Ask']['description'].value;
if(x.length == 0 || y.length == 0){
alert('Insufficient Data');
}else{
startLoading();
console.log(y);
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function(){
if(this.readyState == 4 && this.status==200){
console.log(this.responseText);
if(this.responseText == "All Done"){
clearInterval(startLoadingClearInt);
alert("data Inserted");
// window.location.replace('../profile/userprofile.php');
}
}
};
//here x is very inn some cases and produces an error
xhttp.open("POST","./submitQuestion.php?title="+x+"&description="+y, true);
xhttp.send();
}
}

You cannot transfer large data via url (as messerbill said). You have to send them in the Body:
function submitQuestion(){
var x=document.forms['Ask']['title'].value;
var y=document.forms['Ask']['description'].value;
if(x.length == 0 || y.length == 0){
alert('Insufficient Data');
}else{
startLoading();
console.log(y);
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function(){
if(this.readyState == 4 && this.status==200){
console.log(this.responseText);
if(this.responseText == "All Done"){
clearInterval(startLoadingClearInt);
alert("data Inserted");
// window.location.replace('../profile/userprofile.php');
}
}
};
//here x is very inn some cases and produces an error
xhttp.open("POST","./submitQuestion.php", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send("title="+x+"&description="+y");
}
}
inside the PHP-Script you get the data via the $_POST Array, not via the $_GET Array!

Multiple Ajax calls sometimes fail

I have a PHP script which queries a database and returns a table, depending on the input, e.g.results.php?f=1.
I am trying to call it multiple times from JavaScript:
function go(n,divid) {
document.getElementById(divid).innerHTML = "<img src=\"load.gif\">";
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById(divid).innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", n, true);
xmlhttp.send();
}
Call later
go('results.php?print=1&nh=1','d1');
go('results.php?print=2&nh=1','d2');
go('results.php?print=3&nh=1','d3');
go('results.php?print=4&nh=1','d4');
The PHP code connects to a SQLite3 database. The problem with the above is that sometimes it works, but sometimes one of the queries fails to be prepared by SQLite3::prepare().
What could be wrong? A sqlite race condition? A javascript issue?
When results.php is called just once, the query always succeeds.
Thanks.

Use xhttp instead of xmlhttp.
function go(n,divid) {
var xhttp = new XMLHttpRequest();
document.getElementById(divid).innerHTML = "<img src=\"load.gif\">";
xhttp.onreadystatechange = function () {
if (xhttp.readyState == 4 && xhttp.status == 200) {
document.getElementById(divid).innerHTML = xhttp.responseText;
}
}
xhttp.open("GET", n, true);
xhttp.send();
}
go('results.php?print=1&nh=1','d1');

AJAX xmlhttp.open sumit data using POST method

I am trying to send a form data using POST method and xmlhttp.open
Please help find the error in my code
function submitChat() {
if (form1.msg.value == '' ) {
alert ('ALL FIELDS ARE MANDATORY');
return;
}
var xmlhttp = new XMLHttpRequest();
var msg = form1.msg.value;
var params = 'msg=helloooooooo';
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById('chatlogs').innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open('POST', 'rtest.php?rid=14', true);
xmlhttp.send(params);
}
Everything is fine and it is working with GET method. but POST method is not working. Please help.

javascript in php and using ajax

I'm getting really confused with php,ajax and javascript.
I'm using some ajax code I got from w3 schools to handle a form and display it below the form input. However, I can't seem to get my php and Javascript right. I'm using JavaScript in php tags where I then Get my variable in the same php tags and echo it. I then try to get that variable in ajax. I don't think I'm correctly getting the variable with ajax and inside my php. Does anyone have some advice.
Thanks
Heres my javascript in my html doc
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "hackacronymphp.php?phpAnswer=" + str, true);
xmlhttp.send();
}
}
</script>
Here's the last part of my script with my php afterward all inside one php tag
var stringe = vari.join("");
console.log(stringe);
var answer = dataarray[stringe];
console.log(answer);
</script>
$phpanswer = $_GET['answer']
echo $phpanswer ;
?>

How can I send more than one variable to a php file using ajax and a get request?

I am trying to send an I.D. value and a name value to a php file using ajax. I can send just the I.D. variable just fine but when I try to add the name variable, the function stops working. How can I send both?
This works:
function click() {
var name = clickedelement.getElementsByTagName('input')[0].value;
var id = clickedelement.getElementsByTagName('input')[1].value;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("popupBox").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "friends2.php?id="+id, true);
xmlhttp.send();
};
But when I try to add the name variable, it dosnt work.
function click() {
var name = clickedelement.getElementsByTagName('input')[0].value;
var id = clickedelement.getElementsByTagName('input')[1].value;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("popupBox").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "friends2.php?id="+id"&name="+name, true);
xmlhttp.send();
};

change to "friends2.php?id="+id+"&name="+name you just have a missing +

"friends2.php?id="+id+"&name="
// missing plus sign here ^