javascript 如何使用javascript解析文本文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17648871/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How can I parse a text file using javascript
提问by qwerty123
The code below is to read a text file using javascript. it works. However, I just want to read part of the content. For example, the content of the file is :"Hello world!" I just want to display "Hello". I tried function split(), but it only works on strings. I don't know how to insert it here.
下面的代码是使用javascript读取文本文件。有用。但是，我只想阅读部分内容。比如文件的内容是：“Hello world!” 我只想显示“你好”。我试过函数split()，但它只适用于字符串。我不知道如何插入这里。
var urls = ["data.txt"];
function loadUrl() {
var urlToLoad = urls[0];
alert("load URL ... " + urlToLoad);
browser.setAttributeNS(xlinkNS, "href", urlToLoad);
}
thank you!!!
谢谢！！！
回答by Nathan Srivi
I used
我用了
jQuery.get('http://localhost/foo.txt', function(data) {
var myvar = data;
});
, and got data from my text file.
，并从我的文本文件中获取数据。
Or try this
或者试试这个
JQuery provides a method $.get which can capture the data from a URL. So to "read" the html/text document, it needs to be accessible through a URL. Once you fetch the HTML contents you should just be able to wrap that markup as a jQuery wrapped set and search it as normal.
JQuery 提供了一个 $.get 方法，它可以从 URL 中捕获数据。因此，要“读取”html/text 文档，需要通过 URL 访问它。获取 HTML 内容后，您应该能够将该标记包装为 jQuery 包装集并像往常一样搜索它。
Untested, but the general gist of it...
未经测试，但它的一般要点......
var HTML_FILE_URL = '/whatever/html/file.html';
$(document).ready(function() {
$.get(HTML_FILE_URL, function(data) {
var fileDom = $(data);
fileDom.find('h2').each(function() {
alert($(this).text());
});
});
});
回答by randomizer
Try this to read separate words if I understood correctly what you need. Create a file with the contents "hello world" and browse to it with the example script. The output is "hello".
如果我正确理解了您的需要，请尝试阅读单独的单词。创建一个内容为“hello world”的文件，并使用示例脚本浏览到它。输出是“你好”。
<html>
<head>
<input type="file" id="fileinput" />
<script type="text/javascript">
function readSingleFile(evt) {
var f = evt.target.files[0];
if (f) {
var r = new FileReader();
r.onload = function(e) {
var contents = e.target.result;
var ct = r.result;
var words = ct.split(' ');
alert(words[0]);
}
r.readAsText(f);
} else {
alert("Failed to load file");
}
}
document.getElementById('fileinput').addEventListener('change', readSingleFile, false);
</script>
</head>
<body>
</body>
</html>
Reading directly has to be with an ajax request due to the javascript restrictions regarding safety. This code shoudl perform the requested operation:
由于有关安全的 javascript 限制，直接读取必须使用 ajax 请求。此代码应该执行请求的操作：
<html>
<head>
<input type="file" id="fileinput" />
<script type="text/javascript">
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.status==200 && xmlhttp.readyState==4){
var words = xmlhttp.responseText.split(' ');
alert(words[0]);
}
}
xmlhttp.open("GET","FileName.txt",true);
xmlhttp.send();
</script>
</head>
<body>
</body>
</html>
回答by edi9999
Opening a file in javascript with ajax (without using any framework)
使用ajax在javascript中打开文件（不使用任何框架）
var urls = ["data.txt"];
xhrDoc= new XMLHttpRequest();
xhrDoc.open('GET', urls[0] , async)
if (xhrDoc.overrideMimeType)
xhrDoc.overrideMimeType('text/plain; charset=x-user-defined')
xhrDoc.onreadystatechange =function()
{
if (this.readyState == 4)
{
if (this.status == 200)
{
var data= this.response; //Here is a string of the text data
}
}
}
xhrDoc.send() //sending the request
