Am very new to JSON. So read some topics on w3schools and tried to execute locally but its not working. Kindly anyone help me to overcome this issue.
Note: 1) Kept 1.html and myTutorials.txt files in same directory. 2) I debugged the html code and found that "xmlhttp.status" is always zero. 3) But same code in w3schools website is working fine. Links:
i) http://www.w3schools.com/json/json_http.asp --> 1.html
ii) http://www.w3schools.com/json/myTutorials.txt --> myTutorials.txt
My Html code: 1.html
<!DOCTYPE html>
<html>
<body>
<div id="id01"></div>
<script>
var xmlhttp = new XMLHttpRequest();
var url = "myTutorials.txt";
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var myArr = JSON.parse(xmlhttp.responseText);
myFunction(myArr);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
function myFunction(arr) {
var out = "";
var i;
for(i = 0; i < arr.length; i++) {
out += '<a href="' + arr[i].url + '">' +
arr[i].display + '</a><br>';
}
document.getElementById("id01").innerHTML = out;
}
</script>
</body>
</html>The below contents are from "myTutorials.txt" file.
[
{
"display": "HTML Tutorial",
"url": "http://www.w3schools.com/html/default.asp"
},
{
"display": "CSS Tutorial",
"url": "http://www.w3schools.com/css/default.asp"
},
{
"display": "JavaScript Tutorial",
"url": "http://www.w3schools.com/js/default.asp"
},
{
"display": "jQuery Tutorial",
"url": "http://www.w3schools.com/jquery/default.asp"
},
{
"display": "JSON Tutorial",
"url": "http://www.w3schools.com/json/default.asp"
},
{
"display": "AJAX Tutorial",
"url": "http://www.w3schools.com/ajax/default.asp"
},
{
"display": "SQL Tutorial",
"url": "http://www.w3schools.com/sql/default.asp"
},
{
"display": "PHP Tutorial",
"url": "http://www.w3schools.com/php/default.asp"
},
{
"display": "XML Tutorial",
"url": "http://www.w3schools.com/xml/default.asp"
}
]
The reason XMLHttpRequest doesn't work because you're using file:// protocol to open the html file. The XMLHttpRequest object is used to exchange data with a server behind the scenes. When trying to do a HTTP request using XMLHttpRequest from a local file, it basically fails due to Access-Control-Allow-Origin violation. So what you need to do is to host the html file and text file in a web server and then access the html file using http protocol i.e. enter the url of html page in web browser like: http://www.example.com/1.html.