如何将本地文本文件上传到textarea（在网页内） [英] How to upload a local text file to a textarea (inside the webpage)

问题描述

我是一名新手程序员，需要一些帮助，找出如何将本地文本文件上传到我正在构建的网站内的文本区域。我非常流利的HTML / CSS，我对Javascript / JQuery有很好的了解，我只是在学习PHP。你能给予的任何帮助我都会非常感激。我有一个type =file和name =file的输入，我有一个带有.textbox类的textarea，我有一个运行Upload（）函数的按钮这是我的javascript site。

I am a novice programmer, and need some help figuring out how to upload a local text file to a textarea inside a website I'm building. I am very fluent in HTML/CSS, I have a decent knowledge of Javascript/JQuery, and I am just learning PHP. Any help you can give I would greatly appreciate. I have an input with type="file" and name="file" and I have a textarea with a class of ".textbox", and I have a button that runs the function "Upload()" Here is the javascript for my site.

var localfile = $("input[name=textfile]").val();

function Upload(){
  $(".textbox").append(file);
}

提前致谢！

推荐答案

实现FileReader的现代浏览器可以做到这一点。要测试你的浏览器，请检查是否定义了window.FileReader。

Modern browsers implementing FileReader can do this. To test your browser check if window.FileReader is defined.

这是我几天前写的一些代码。在我的例子中，我只需将文件拖到HTML元素上，该元素在此处引用为panel.in1，但您也可以使用（参见下面的参考资料）。

Here is some code I wrote a few days ago to do just this. In my case I simply drag a file onto the HTML element which is here referenced as panel.in1 but you can also use (see the reference below).

if (window.FileReader) {
  function dragEvent (ev) {
    ev.stopPropagation (); 
    ev.preventDefault ();
    if (ev.type == 'drop') {
      var reader = new FileReader ();
      reader.onloadend = function (ev) { panel.in1.value += this.result; };
      reader.readAsText (ev.dataTransfer.files[0]);
    }  
  }

  panel.in1.addEventListener ('dragenter', dragEvent, false);
  panel.in1.addEventListener ('dragover', dragEvent, false);
  panel.in1.addEventListener ('drop', dragEvent, false);
}

这是reader.onloadend函数，它获取你的文件的文本在事件处理程序中恢复为this.result。

It is the reader.onloadend function which gets the text of the file which you recover in the event handler as this.result.

我从MDN获得了大部分关于如何执行此操作的机制： https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications

I got most of the mechanism on how to do this from MDN : https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications

这段代码显示了读取文件的基础知识，文件本身被拖入文本区域，我认为这是一个更好的界面，而不是必须通过选择文件机制，但这些工作同样适用于选择要读的文件。

This code shows the basics of reading the file, the file itself is dragged into the text area, a nicer interface, I think, than having to go through the select file mechanisms, but those work equally well to select the file to read.

这是我对类似问题的回答：使用javascript获取文本文件内容

This is my answer to the similar question : Get text file content using javascript

这篇关于如何将本地文本文件上传到textarea（在网页内）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！