所请求的资源上没有"Access-Control-Allow-Origin"标头.因此，不允许访问原始“空" [英] No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access
问题描述
我正在尝试使用Javascript在本地apache服务器上读取csv，但是出现以下错误. 下面是我的代码:-
I am trying to read a csv on my local apache server using Javascript but I get the following error . Below is my code:-
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Circles</title>
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
</style>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
<script>
function csvToJS(csv) {
var resp=[];
var rows = csv.split('\n');
for(var i=0;i<rows.length;i++){
var row=rows[i].split(',');
//code
resp[i]=row;
}
return resp;
}
var citymap;
var req = new XMLHttpRequest();
var file = "http://localhost:8080/example/data.csv";
req.open('GET', file, true);
req.send();
req.onreadystatechange = function() {
if (req.status == 200) {
var csv = req.responseText;
var data = csvToJS(csv);
console.log(data);
citymap = data;
}
initialize();
};
var cityCircle;
function initialize() {
//Code here////
}
}
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
但我收到此错误XMLHttpRequest cannot load http://localhost:8080/example/data.csv. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
我使用Java程序创建此csv.那么谁能给我一个替代的解决方案呢?
谁能帮我解决这个问题.
But I get this error XMLHttpRequest cannot load http://localhost:8080/example/data.csv. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
I create this csv using a java program . So can anyone give me an alternative solution for this ?
Can anyone please help me fix this .
推荐答案
从HTTP服务器而不是直接从磁盘加载HTML文件，因此源将是http://localhost:8080而不是null.
Load your HTML file from the HTTP server instead of directly from the disk so the origin will be http://localhost:8080 instead of null.
这篇关于所请求的资源上没有"Access-Control-Allow-Origin"标头.因此，不允许访问原始“空"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
