Javascript 读取txt文件
[英]Javascript reading txt file
问题描述
I have found some code where I can make a javascript chart with.The values are loaded from a website.
我找到了一些代码，我可以在其中制作 javascript 图表。这些值是从网站加载的。 But now I want to load the values from a local txt file like: :C:\Users\OneDrive\Bureaublad\Cha但现在我想从本地 txt 文件加载值，如：:C:\Users\OneDrive\Bureaublad\Cha
The code代码
<!DOCTYPE HTML>
<html>
<head>
<script>
//chart
window.onload = function() {
var dataPoints = [];
var chart = new CanvasJS.Chart("chartContainer", {
theme: "light2",
title: {
text: "Live Data"
},
data: [{
type: "line",
dataPoints: dataPoints
}]
});
updateData();
// Initial Values
var xValue = 0;
var yValue = 10;
var newDataCount = 6;
function addData(data) {
if (newDataCount != 1) {
$.each(data, function(key, value) {
dataPoints.push({
x: value[0],
y: parseInt(value[1])
});
xValue++;
yValue = parseInt(value[1]);
});
} else {
//dataPoints.shift();
dataPoints.push({
x: data[0][0],
y: parseInt(data[0][1])
});
xValue++;
yValue = parseInt(data[0][1]);
}
newDataCount = 1;
chart.render();
setTimeout(updateData, 1500);
}
function updateData() {
var rawFile = new XMLHttpRequest();
rawFile.open("GET", "file:///C:\Users\nickv\OneDrive\Bureaublad\Cha\test.txt", false);
rawFile.onreadystatechange = function ()
{
if(rawFile.readyState === 4)
{
if(rawFile.status === 200 || rawFile.status == 0)
{
var allText = rawFile.responseText;
addData(allText);
}
}
}
}
}
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
<script src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
<script src="https://canvasjs.com/assets/script/jquery.canvasjs.min.js"></script>
</body>
</html>
But I want it to use a local txt file.但我希望它使用本地 txt 文件。
In the txt file: [[0, 7], [1, 12], [2, 7], [3, 3], [4, 0], [5, 4]]在txt文件中：[[0, 7], [1, 12], [2, 7], [3, 3], [4, 0], [5, 4]]
Anyone knows how to do this任何人都知道如何做到这一点
1 个解决方案
解决方案1
-1 2021-01-24 08:36:36
Change path of the file.更改文件的路径。 $.getJSON("https://www.mywebsite/thetextfile.txt", addData); to $.getJSON("C:\Users\OneDrive\Bureaublad\Cha.txt", addData);到$.getJSON("C:\Users\OneDrive\Bureaublad\Cha.txt", addData); . .
解决方案2
-1 2021-01-24 08:36:50
I have found some code where I can make a javascript chart with.The values are loaded from a website.我找到了一些代码，可以在其中制作 javascript 图表。这些值是从网站加载的。 But now I want to load the values from a local txt file like: :C:\Users\OneDrive\Bureaublad\Cha但现在我想从本地 txt 文件中加载值，例如： :C:\Users\OneDrive\Bureaublad\Cha
The code编码
<!DOCTYPE HTML>
<html>
<head>
<script>
//chart
window.onload = function() {
var dataPoints = [];
var chart = new CanvasJS.Chart("chartContainer", {
theme: "light2",
title: {
text: "Live Data"
},
data: [{
type: "line",
dataPoints: dataPoints
}]
});
updateData();
// Initial Values
var xValue = 0;
var yValue = 10;
var newDataCount = 6;
function addData(data) {
if (newDataCount != 1) {
$.each(data, function(key, value) {
dataPoints.push({
x: value[0],
y: parseInt(value[1])
});
xValue++;
yValue = parseInt(value[1]);
});
} else {
//dataPoints.shift();
dataPoints.push({
x: data[0][0],
y: parseInt(data[0][1])
});
xValue++;
yValue = parseInt(data[0][1]);
}
newDataCount = 1;
chart.render();
setTimeout(updateData, 1500);
}
function updateData() {
var rawFile = new XMLHttpRequest();
rawFile.open("GET", "file:///C:\Users\nickv\OneDrive\Bureaublad\Cha\test.txt", false);
rawFile.onreadystatechange = function ()
{
if(rawFile.readyState === 4)
{
if(rawFile.status === 200 || rawFile.status == 0)
{
var allText = rawFile.responseText;
addData(allText);
}
}
}
}
}
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
<script src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
<script src="https://canvasjs.com/assets/script/jquery.canvasjs.min.js"></script>
</body>
</html>
But I want it to use a local txt file.但我希望它使用本地 txt 文件。
In the txt file: [[0, 7], [1, 12], [2, 7], [3, 3], [4, 0], [5, 4]]在txt文件中：[[0, 7], [1, 12], [2, 7], [3, 3], [4, 0], [5, 4]]
Anyone knows how to do this任何人都知道如何做到这一点
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