Develop Reference

HTTPRequest ajax error with slesh in end of Uri in codeigniter

Help guest...
i make web using framework Codeigniter and also using ajax XMLHttp Request to load some data from DB.
if i open the link Like this
localhost/web/topsales
every things is OK like this. Images
but if i add slash in end of url
localhost/web/topsales/
the result is error. Ajax load and duplicate the pages view like this image
i use AJAX XMLHttp Request for load the data:
function showdata()
{
var idunit = document.getElementById('idunit').value;
var month = document.getElementById('month').value;
var year = document.getElementById('year').value;
var xmlhttp;
document.getElementById("result").innerHTML = "<div class='text-center'>Loading...</div>"; //xmlhttp.responseText
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("result").innerHTML = xmlhttp.responseText; //xmlhttp.responseText
}
}
xmlhttp.open("POST","showresult",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send("idunit="+idunit+"&month="+month+"&year="+year);
}
please i need help, thanks so much for some advice.

Error incorrect function in XMLHttpRequest.open() method

I done a ajax call to local http server but I got error in xmlhttp.open("GET", "http://localhost//push", true); incorrect function in IE 11, Below is my full code:
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) {
....some code.....
}}
}
xmlhttp.open("GET", "http://localhost//push", true);
xmlhttp.send();
}
IE uses new XMLHttpRequest();

Finally i got the answer very silly issue, In chrome URL can be "http://localhost//push" but in IE it should have backslash instead of forward slash "http:\\localhost\\push" or else it will show incorrect function

Javascript - read data from multiple files in sequence

I have a function ReadFromFile that reads from a single file on server.
How do I write a function, that can read from multiple files on server and save data from each file in separate variable in sequence?
// Update measure data from files
function ReadFromFile(filename)
{
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)
{
dataset_01 = xmlhttp.responseText;
}
}
xmlhttp.open("GET", filename, true);
xmlhttp.send();
}

sending image as a parameter in xmlhttprequest Post method failed

I am new to JavaScript. In this first i sent successfully some data as a parameters in xmlhttprequest post method. But after that i am trying to send Image as a parameter but this time the post method fails.Here i am using content-type as a multipart/form-data
I am successfully sent image as a parameter in post method.But this time i used <form> tag.
Please any one tell me about this? why my first procedure fails?
function store(){
var pname=document.getElementById("pname").value;
var price=document.getElementById("price").value;
var discount=document.getElementById("discount").value;
var desc=document.getElementById("desc").value;
var heading=document.getElementById("heading").value;
var image=document.getElementById("image").value;
var params="pname="+pname+"&price="+price+"&discount="+discount+"&desc="+desc+"&heading="+heading+"&image="+image;
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)
{
var txt=xmlhttp.responseText;
var obj = eval ("(" + txt + ")");
if(obj.success)
{
userlogin(obj.username,obj.password);
}
else
document.location.href="Userregistration.jsp";
//document.getElementById("countryname").innerHTML=obj.CurrencyById[0].country;
alert("Registered");
}
}
xmlhttp.open("POST","Newproduct",true);
xmlhttp.setRequestHeader("Content-type", "multipart/form-data");
xmlhttp.send(params);
}

Xmlhttp status check when url is down without libraries like Jquery

I am trying to check if the given url is working or not using ajax. So i modified the Ajax a little bit.
function isServerAlive()
{
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)
{
document.getElementById("myDiv").innerHTML=xmlhttp.status;
}
}
xmlhttp.open("GET","wrongurl",true);
xmlhttp.send();
}
All i want to do is it to display the xmlhttp.status as 404 or 503 when the url is wrong. But it is not printing. Any suggestions?

You have status code available in .status and the text in .statusText
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState == 4)
console.log("Code: " + xmlhttp.status + "Status text: " + xmlhttp.statusText);
}

a respone object is passed to the xmlhttp events, so use this instead:
xmlhttp.onreadystatechange=function(r) {
if (r.readyState == 4) {
document.getElementById("myDiv").innerHTML = r.status;
}
}

I don't think you'd be able to use XHR to check if url is working, as the url has to be from the same origin as the original page. First check if your solution works correctly when accessing a local url.