I have this function below and I call that function in a loop I get the alert n times but only n-1 or sometimes n-2 responses
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
alert(xmlhttp.responseText);
//document.getElementById("warnings_panel").innerHTML+=xmlhttp.responseText;
}
}
alert("in ajax)
xmlhttp.open("GET","getresponse.php?start="+ start + "&end=" + end,true);
xmlhttp.send();
I have made a class (that you can modify easily) for calling a function in loop and it calls the functions correctly. Maybe this could apply to your need.
(Also if anyone sees something wrong it's good to hear from others)
test.htm
<html>
<head>
<script type="text/javascript">
function myXmlHttp() {
/*constructor simulator*/
this.setPersitent=
function (file, onReadyFunc,params,loop)
{
myXmlHttpObj.loop = loop;
myXmlHttpObj.file=file;
myXmlHttpObj.onReadyFunc='myXmlHttpObj.'+onReadyFunc;
myXmlHttpObj.params=params;
myXmlHttpObj.mySetRequest();
}
this.setParams=
function ( params )
{
myXmlHttpObj.params=params;
}
<!--Standard initial code-->
this.mySetRequest =
function ()
{
request = false;
try { request = new XMLHttpRequest(); }
catch (trymicrosoft) {
try { request = new ActiveXObject("Msxml2.XMLHTTP"); }
catch (othermicrosoft) {
try {request = new ActiveXObject("Microsoft.XMLHTTP");}
catch (failed) {request = false;}/*catch3*/}/*catch2*/}/*catch1*/
if (!request)
alert("Error initializing XMLHttpRequest!");
} /*func*/
this.mySendReq=
function()
{
var url = myXmlHttpObj.file;
request.open("POST", url, true);
//Some http headers must be set along with any POST request.
request.setRequestHeader
("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
request.setRequestHeader("Content-length", myXmlHttpObj.params.length);
request.setRequestHeader("Connection", "close");
request.onreadystatechange = eval(myXmlHttpObj.onReadyFunc);
request.send(myXmlHttpObj.params);
}
this.listenPHP =
function ( ) {
if ( request.readyState == 4) {
if ( request.status == 200)
{
alert(request.responseText);
myXmlHttpObj.loop--;
if(myXmlHttpObj.loop>0)
{
myXmlHttpObj.setParams("js_rand="+Math.random()+"");
myXmlHttpObj.mySendReq();
}
}//inner if
else{alert("status is " + request.status);}
}//outer iff
}//function
}//END
myXmlHttpObj = new myXmlHttp();
myXmlHttpObj.setPersitent
('getresponse.php', 'listenPHP',"js_rand="+Math.random()+"",3) ;
myXmlHttpObj.mySendReq();
</script>
</head>
<body >
</body>
</html>
and getresponse.php
<?PHP
echo 'I recived this random from js:',$_POST['js_rand'],'
this rand is from php:',rand(1,9999);
?>
onreadystatechange gets terminated when your function ends because the xmlhttp object gets removed as it is not a global variable. Am I right?
Better would be to put only the AJAX request in a function, so that the xmlhttp object is only created once (I used a shorter version to create the xmlhttp object in this example).
var xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
function request() {
xmlhttp.open('GET', 'getresponse.php?start=' + start + '&end=' + end, true);
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
alert(xmlhttp.responseText);
}
}
xmlhttp.send(null);
}
Generally, this should work, but we need more information about how you actually run that loop to know what might be wrong.
I also added encodeURIComponent and changed the condition inside the callback function, because status isn't always 200 when readyState reaches 4.
function request(start, end) {
var xmlhttp;
if (window.XMLHttpRequest)
xmlhttp = new XMLHttpRequest();
else
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open('GET', 'getresponse.php?start=' + encodeURIComponent(start) + '&end=' + encodeURIComponent(end), true);
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4)
if (xmlhttp.status == 200) {
alert(xmlhttp.responseText);
} else {
// status ≠ 200, output useful error message
}
};
xmlhttp.send();
}
Related
i'm trying to execute a javascript function every 'n' periods of time ,the function will call a php file which will execute a sort of code,but unfortunately it doesn't work ,here;s the code
<p id="code"></p>
<script>
var myVar=setInterval(function(){showUser()},1000);
function showUser() {
var xmlhttp = null;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById('txtHint').innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open('GET', 'getuser.php');
xmlhttp.send();
document.getElementById("code").innerHTML=t;
}
</script>
//edit this
document.getElementById('txtHint').innerHTML = xmlhttp.responseText;
//to
document.getElementById("code").innerHTML = xmlhttp.responseText;
//and delete
document.getElementById("code").innerHTML=t;
Sorry for my english...
How could I send the information that's in Ajax with POST? (info, info_1, info_2)
Now, I'm sending it with GET
edit: i try to do what people here said me to do, but when i call the POST variable in the page that i send for him the info, its show me eror... why?
the new code:
var xhr = new XMLHttpRequest();
xhr.open("POST",url,true);
xhr.onreadystatechange = function() {
if( this.readyState == 4 && this.status == 200) {
document.getElementById(name).innerHTML = this.responseText;
}
};
xhr.send("info="+str+"&info_1="+info_1+"&info_2="+info_2);
return false;
the first code:
var xhr = new XMLHttpRequest();
xhr.open("GET",url+"?info="+str+"&info_1="+info_1+"&info_2="+info_2,true);
xhr.onreadystatechange = function() {
if( this.readyState == 4 && this.status == 200) {
document.getElementById(name).innerHTML = this.responseText;
}
};
xhr.send();
return false;
Change "GET" to "POST" and put the data (in the same form as in the query string, but without the ? prefix) as the argument to the send() method instead of in the URL.
I used this code. It worked
function getXMLHttpRequestObject()
{
var xmlhttp;
if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp = false;
}
}
return xmlhttp;
}
function callme1(){
var http = new getXMLHttpRequestObject();
var url = "yourpage.php";
var reply;
var conf=true;
var parameters = "info="+str+"&info_1="+info_1+"&info_2="+info_2;
http.open("POST", url, true);
//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", parameters .length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {
if(http.readyState == 4) {
alert(http.responseText);
}
}
http.send(parameters);
}
Just call function callme1() and it will post the request to yourpage.php
This is how to send Post request in ajax
var str="hrl";// initialize str
var info_1="hi"; // initialize info_1
var info_2="hi"; // initialize info_2
var url="index.jsp"; // initialize url
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("POST",url,true);// initialize url
xmlhttp.send("info="+ str +"&info_1="+ info_1 +"&info_2="+info_2+"");
Just beginner in php, I want to call php method using AJAX. I tried every thing but don't know what error is. Not getting any response from object xmlhttp.
Heres my java script code :
function loadData(){
var mID=ddItems;
var method=2;
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
if (xmlhttp.readyState == 4 || xmlhttp.readyState == 0) {
xmlhttp.open("GET", "../code/GetItemsInDD.class.php?id=" + mID + "&method=" + method, true); **// is this statement correct**
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200) **//conditin is false,**
{
document.getElementById("ddItems").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.send();
}
}
My js file is on "projectname/javascript/script.js" and my php file is in "projectname/code/GetItemsInDD.class.php" dir.
Why don't you use jQuery for making AJAX requests? Its as simple as this, include jQuery in your page
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
and JS code,
$.ajax({
type: 'GET',
url: '../code/GetItemsInDD.class.php?id=" + mID + "&method=" + method',
success: function (data) {
document.getElementById("ddItems").innerHTML = data;
}
});
This way, you don't need to check for the readyState and status thing
jQuery follows object oriented approach for declaring XMLHttpRequest objects, so you won't have to worry about creating multiple objects for making more than one AJAX requests.
function loadData(){
var xmlhttp;
var mID=ddItems;
var method=2;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("ddItems").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET", "../code/GetItemsInDD.class.php?id=" + mID + "&method=" + method, true);
xmlhttp.send();
}
I have made 2 desired changes to your code, try running it now. Make sure the URL is correct.
function loadData()
{
var mID=ddItems;
var method=2;
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else //For some versions of IE
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200) **//conditin is false,**
{
document.getElementById("ddItems").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET", "../code/GetItemsInDD.class.php?id=" + mID + "&method=" + method, true); **// is this statement correct**
xmlhttp.send();
}
}
Change 1 : You may be running the code in an older version of IE, where ActiveXObject is used.
Change 2 : The open() method should not be called if the readyState changes ( as you have written it within the IF block), readyState changes only after the ajax call is initialized by the open() method and then send by the send() method.
I am using an AJAX script to post data from a form and return the processed data from a php file. The script is below.
function loadXmlDoc(hashtag){
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}
else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
document.getElementById("ajaxify").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("POST", "demo_ajax3.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send("hashtag=" + hashtag);
}
However I want to auto update the results. how would I get this to auto update so it checks for more data? Or what would be the best way?
There seems to be nothing about getting AJAX forms to auto refresh from what I've seen so any help would be greatly apprecaited
Try this way. It should auto-update the result every 10 seconds.
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}
else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
document.getElementById("ajaxify").innerHTML = xmlhttp.responseText;
}
}
function loadXmlDoc(hashtag){
var repeat = function () {
xmlhttp.open("POST", "demo_ajax3.php", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send("hashtag=" + hashtag);
};
repeat.hashtag = hashtag;
setInterval(function() { repeat(); },10000);
}
I am applying the following Javascript in a check form function:-
var msg1="";
function check_si_form_info(form,mark,edit){
if(mark==10 || mark=="all"){
if(form.email.value==""){
si_check_email.innerHTML="";
si_check_email.style.height="0px";
form.email.style.backgroundColor="#FFFFFF";
}else{
var i=form.email.value.indexOf("#");
var j=form.email.value.indexOf(".");
if((i<0)||(j<0)){
si_check_email.innerHTML="The email address format is incorrect！";
si_check_email.style.height="auto";
form.email.style.backgroundColor="#FFD5FF";
return false;
}
else{
var email = form.email.value;
xmlhttp=new XMLHttpRequest(); //HERE!!!!
xmlhttp.open('get','si/check_si_email.php?email='+email,true);
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState == 4){
if(xmlhttp.status == 200){
msg1 = xmlhttp.responseText;
if(msg1 == '1'){
si_check_email.innerHTML="email address has been used!";
si_check_email.style.height="auto";
form.email.style.backgroundColor="#FFD5FF";
}else if(msg1 == '2'){
si_check_email.innerHTML="";
si_check_email.style.height="0px";
form.email.style.backgroundColor="#FFFFFF";
}else if(msg1 == '3'){
si_check_email.innerHTML="";
si_check_email.style.height="0px";
form.email.style.backgroundColor="#FFFFFF";
}
}//200
}//4
}//onreadystatechange
xmlhttp.send(null);
}
if (msg1 == '1'){
return false;
}
}
}
}
In IE 7 or above, the scripts work perfectly well. But in IE6, the browser always mention the "XMLHttpRequest()" is not defined. If I wish to define it, where and what shall I input?? Thanks a lot!
In IE6 you need to use new ActiveXObject('Microsoft.XMLHTTP') to create the XHR object.
var xmlhttp;
try {
xmlhttp = new XMLHttpRequest(); // real browsers
} catch(e) {
xmlhttp = new ActiveXObject('Microsoft.XMLHTTP'); // <=IE6
}
But you should really use jQuery, it does all the dirty work for you.
Additionally dropping IE6 support wouldn't be a bad thing.
xmlhttp=new XMLHttpRequest();
if(!xmlhttp && typeof ActiveXObject != "undefined"){
try{ xmlhttp=new ActiveXObject("MSXML2.XMLHTTP"); }catch(e){xmlhttp=false;}
if(!xmlhttp)try{ xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); }catch(e){xmlhttp=false;}
}
In the article on AJAX on Wikipedia you have an example how to enable support of AJAX within IE 5, IE 5.5 and IE 6. The example is as follows:
/*
Provide the XMLHttpRequest constructor for Internet Explorer 5.x-6.x:
Other browsers (including Internet Explorer 7.x-9.x) do not redefine
XMLHttpRequest if it already exists.
This example is based on findings at:
http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
*/
if (typeof XMLHttpRequest == "undefined")
XMLHttpRequest = function () {
try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); }
catch (e) {}
try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); }
catch (e) {}
try { return new ActiveXObject("Microsoft.XMLHTTP"); }
catch (e) {}
//Microsoft.XMLHTTP points to Msxml2.XMLHTTP and is redundant
throw new Error("This browser does not support XMLHttpRequest.");
};