无法将数据写入Node JS中的文件 [英] Not able to write data to a file in Node JS

问题描述

我想在Node Js的已经创建的文件中写文本。这是我所做的事情

Upload.html

 < / p> form enctype =multipart / form-dataaction =/ filemethod =post> 
 
 
 MAC地址：< br> 
< input type =textname =macaddid =macadd>< br> 
 
百分比：< br> 
< input type =textname =percentid =percent>< br> 
 
 
 
< input type =submitvalue ='Submit'id =upload> 
< br> 
 
< / form> 
  

App.js

 （$）$ 
 var macadd = req.body.macadd; 
 // var percent = req.body.percent; 
 var path =C：\Proj\doc\data.txt; 
 var data =hello; 
 
 fs.writeFile（path，macadd，function（error）{
 if（error）{
 console.error（write error：+ error.message）; 
} else {
 console.log（成功写入+路径）; 
} 
}）; 
}）; 
  

我想将'macadd'的值写入文件data.txt。它大多是一个整数值，但是当我点击提交时，在文件中，即使它显示为在控制台上成功写入，它也是未定义。任何解决方案？

解决方案

我刚刚在路径的文件夹之间添加了两个斜线，并添加了路径解析包。就像这样：
$ b $ var path = resolve（C：\\Proj\\doc\\data.txt ）;

为了将文本框的值存入文件中，我必须删除form标签中的加密类型。 p>

 < form action =/ filemethod =post> 
 
 
 MAC地址：< br> 
< input type =textname =macaddid =macadd>< br> 
 
百分比：< br> 
< input type =textname =percentid =percent>< br> 
 
 
 
< input type =submitvalue ='Submit'id =upload> 
< br> 
 
< / form> 
  

I want to write text in an already created file in Node Js. Here is what I have done

Upload.html

<form enctype ="multipart/form-data" action ="/file" method ="post">


    MAC Address:<br>
  <input type="text" name="macadd" id="macadd"><br>

  Percentage:<br>
  <input type="text" name="percent" id="percent"><br>



<input type="submit"  value='Submit' id="upload">
<br>

</form>

App.js

app.route('/file').post(function (req,res,next) {

        var macadd =req.body.macadd;
       //var percent =req.body.percent;
        var path ="C:\Proj\doc\data.txt";
        var data ="hello";

        fs.writeFile(path,macadd , function(error) {
            if (error) {
                console.error("write error:  " + error.message);
            } else {
                console.log("Successful Write to " + path);
            }
        });
    });

I want to write the value of 'macadd' into the file data.txt. It is mostly an integer value but when I click on submit, in the file it comes as 'undefined' even though it shows as successful write on the console. Any solutions?

解决方案

I just added 2 slashes between the folders of the path and added the path-resolve package. Something like this:

var path =resolve("C:\\Proj\\doc\\data.txt");

For getting the values of the text box into the file I had to remove the encryption type in the form tag.

<form action ="/file" method ="post">


    MAC Address:<br>
  <input type="text" name="macadd" id="macadd"><br>

  Percentage:<br>
  <input type="text" name="percent" id="percent"><br>



<input type="submit"  value='Submit' id="upload">
<br>

</form>

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