的FileReader和codeMIRROR加载文件并发症 [英] FileReader and CodeMirror Load File Complication

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本文介绍了的FileReader和codeMIRROR加载文件并发症的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

默认codeMIRROR HTML编辑以preVIEW - http://jsfiddle.net/D9MvH/ 1 / - http://liveweave.com/zSqCfA

在的FileReader API codeMIRROR加载文件 - http://liveweave.com/VvsXN9

这里是什么我试图做一个很简单的例子。 （保存功能不会对这些网上的编辑工作，但导入文件函数可以使用这个简单的编辑器） - 的http：// liveweave .COM / MrUBfZ

我的问题是，当我点击我的输入文件的形式来浏览文件。我选择要打开HTML文件，它不会与/在codeMIRROR打开。我想我所知的一切并不能得到它的工作。任何人都可以帮助呢？

HTML 

 ＆LT;输入类型=文件的onchange =的loadFile（本）＆GT;

的JavaScript 

  VAR延迟;//初始化codeMIRROR编辑器
VAR编辑= codeMirror.fromTextArea（的document.getElementById（'code'）{
    模式：text / html的'，
    tabMode：缩进，
    lineNumbers：真实，
    lineWrapping：真实，
    autoCloseTags：真
}）;//直播preVIEW
editor.on（变，函数（）{
    clearTimeout（延迟）;
    延迟= setTimeout的（更新preVIEW，300）;
}）;功能更新preVIEW（）{
    VAR previewFrame =的document.getElementById（'preVIEW'）;
    VAR preVIEW = previewFrame.contentDocument || previewFrame.contentWindow.document;
    preview.open（）;
    preview.write（editor.getValue（））;
    preview.close（）;
}
的setTimeout（更新preVIEW，300）;功能saveTextAsFile（）{
    。VAR textToWrite =的document.getElementById（code）的价值;
    VAR textFileAsBlob =新的Blob（[textToWrite] {类型：text / plain的'}）;
    VAR fileNameToSaveAs =myfile.html;    变种downloadLink = document.createElement方法（一）;
    downloadLink.download = fileNameToSaveAs;
    downloadLink.innerHTML =下载文件;
    如果（window.webkitUR​​L！= NULL）
    {
        //浏览器允许点击链接
        //而不实际将它添加到DOM。
        downloadLink.href = window.webkitUR​​L.createObjectURL（textFileAsBlob）;
    }
    其他
    {
        //火狐要求的链路被添加到DOM
        //才可以点击。
        downloadLink.href = window.URL.createObjectURL（textFileAsBlob）;
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display =无;
        document.body.appendChild（downloadLink）;
    }    downloadLink.click（）;}功能destroyClickedElement（事件）{
    document.body.removeChild（event.target）;}功能的loadFile（输入）{
    VAR读卡器=新的FileReader（）
    reader.onload =功能（E）{
        editor.setValue = e.target.result;}
    reader.readAsText（input.files [0]）;}    VAR输入=的document.getElementById（选择）;    功能selectTheme（）{
      VAR主题= input.options [input.selectedIndex] .innerHTML;
      editor.setOption（主旋律，主题）;
    }    VAR的选择= document.location.search＆放大器;＆安培;
               德codeURIComponent（document.location.search.slice（1））;
    如果（选择）{
      input.value =选择;
      editor.setOption（主旋律，选择）;
    }

展开code 

 ＆LT;！DOCTYPE HTML＆GT;
＆LT; HTML和GT;
＆LT; HEAD＆GT;
＆LT;间的charset =UTF-8＆GT;
＆LT;标题＆GT; codeMIRROR：HTML5 preVIEW＆LT; /标题＆GT;
＆LT;脚本的src =HTTP：//$c$cmirror.net/lib/$c$cmirror.js'>＆LT; / SCRIPT＆GT;
＆LT;脚本的src =HTTP：//$c$cmirror.net/mode/xml/xml.js'>＆LT; / SCRIPT＆GT;
＆LT;脚本的src =HTTP：//$c$cmirror.net/mode/javascript/javascript.js'>＆LT; / SCRIPT＆GT;
＆LT;脚本的src =HTTP：//$c$cmirror.net/mode/css/css.js'>＆LT; / SCRIPT＆GT;
＆LT;脚本的src =HTTP：//$c$cmirror.net/mode/htmlmixed/htmlmixed.js'>＆LT; / SCRIPT＆GT;
＆LT;链接相对=样式HREF =HTTP：//$c$cmirror.net/lib/$c$cmirror.css'>
＆LT;链接相对=样式HREF =HTTP：//$c$cmirror.net/doc/docs.css'>
＆LT;风格类型='文字/ CSS'＆GT;
。$ C $ {CMIRROR
    浮动：左;
    宽度：50％;
    边框：1px的纯黑色;}IFRAME {
    宽度：49％;
    浮动：左;
    高度：300像素;
    边框：1px的纯黑色;
    左边框：0像素;}
＆LT; /风格＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
    ＆LT; textarea的ID =codeNAME =code＆GT;＆LT;！DOCTYPE HTML＆GT;
＆LT; HTML和GT;
＆LT; HEAD＆GT;
＆LT;间的charset = UTF-8＆GT;
＆LT;标题＆GT; HTML5画布演示＆LT; /标题＆GT;
＆LT;花柱指p {FONT-FAMILY：等宽;}＆LT; /风格＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
    ＆LT; P＆GT;画布窗格放在这里：LT; / P＆GT;
    ＆LT;画布ID =窗格WIDTH = 300 HEIGHT = 200＆GT;＆LT; /帆布＆GT;    ＆LT;脚本＆GT;
      VAR帆布=的document.getElementById（'窗格'）;
      VAR上下文= canvas.getContext（'2D'）;      context.fillStyle ='RGB（250,0,0）;
      context.fillRect（10，10，55，50）;      context.fillStyle ='RGBA（0，0，250，0.5）';
      context.fillRect（30，30，55，50）;
    ＆LT; / SCRIPT＆GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;＆LT; / textarea的＆GT;    ＆LT; IFRAME ID =preVIEW＆GT;＆LT; / IFRAME＆GT;    ＆LT;输入类型=文件的onchange =的loadFile（本）＆GT;
    ＆LT; A HREF =＃我的头的onclick ='saveTextAsFile（）'＆GT;保存/下载＆LT; / A＆GT;＆LT;脚本＆GT;
VAR延迟;//初始化codeMIRROR编辑器
VAR编辑= codeMirror.fromTextArea（的document.getElementById（'code'）{
    模式：text / html的'，
    tabMode：缩进，
    lineNumbers：真实，
    lineWrapping：真实，
    autoCloseTags：真
}）;//直播preVIEW
editor.on（变，函数（）{
    clearTimeout（延迟）;
    延迟= setTimeout的（更新preVIEW，300）;
}）;功能更新preVIEW（）{
    VAR previewFrame =的document.getElementById（'preVIEW'）;
    VAR preVIEW = previewFrame.contentDocument || previewFrame.contentWindow.document;
    preview.open（）;
    preview.write（editor.getValue（））;
    preview.close（）;
}
的setTimeout（更新preVIEW，300）;功能saveTextAsFile（）{
    。VAR textToWrite =的document.getElementById（code）的价值;
    VAR textFileAsBlob =新的Blob（[textToWrite] {类型：text / plain的'}）;
    VAR fileNameToSaveAs =myfile.html;    变种downloadLink = document.createElement方法（一）;
    downloadLink.download = fileNameToSaveAs;
    downloadLink.innerHTML =下载文件;
    如果（window.webkitUR​​L！= NULL）
    {
        //浏览器允许点击链接
        //而不实际将它添加到DOM。
        downloadLink.href = window.webkitUR​​L.createObjectURL（textFileAsBlob）;
    }
    其他
    {
        //火狐要求的链路被添加到DOM
        //才可以点击。
        downloadLink.href = window.URL.createObjectURL（textFileAsBlob）;
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display =无;
        document.body.appendChild（downloadLink）;
    }    downloadLink.click（）;}功能destroyClickedElement（事件）{
    document.body.removeChild（event.target）;}功能的loadFile（输入）{
    VAR读卡器=新的FileReader（）;
    reader.onload =功能（E）{
        的document.getElementById（'code'）值= e.target.result;}
    reader.readAsText（input.files [0]）;}    VAR输入=的document.getElementById（选择）;    功能selectTheme（）{
      VAR主题= input.options [input.selectedIndex] .innerHTML;
      editor.setOption（主旋律，主题）;
    }    VAR的选择= document.location.search＆放大器;＆安培;
               德codeURIComponent（document.location.search.slice（1））;
    如果（选择）{
      input.value =选择;
      editor.setOption（主旋律，选择）;
    }
＆LT; / SCRIPT＆GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;


解决方案

您只是简单地滥用codeMIRROR;当文件内容加载到读者，而不是分配值到 textarea元素的，例如：

reader.onload =功能（E）{
    。的document.getElementById（'code'）值= e.target.result;
}

＆hellip;使用codeMIRROR API和插入通过的编辑器实例内容的的setValue（）方法，像这样：

reader.onload =功能（E）{
    editor.setValue（e.target.result）;
}

查看 codeMIRROR为 doc.setValue文档（内容：字符串） 和这里的的更新，工作演示 说明这一点。

Default CodeMirror HTML Editor with Preview - http://jsfiddle.net/D9MvH/1/ - http://liveweave.com/zSqCfA

Load File in CodeMirror with FileReader API - http://liveweave.com/VvsXN9

Here's a very simple example of what I'm trying to do. (Save function don't work on these online editors, but the import file function works on this simple editor) - http://liveweave.com/MrUBfZ

My problem is when I click my input file form to browse for a file. I choose the HTML document to be opened and it won't open with/in CodeMirror. I tried everything of my knowledge and can't get it to work. Can anyone help with this?

HTML:

<input type="file" onchange="loadfile(this)">

JavaScript:

var delay;

// Initialize CodeMirror editor
var editor = CodeMirror.fromTextArea(document.getElementById('code'), {
    mode: 'text/html',
    tabMode: 'indent',
    lineNumbers: true,
    lineWrapping: true,
    autoCloseTags: true
});

// Live preview
editor.on("change", function() {
    clearTimeout(delay);
    delay = setTimeout(updatePreview, 300);
});

function updatePreview() {
    var previewFrame = document.getElementById('preview');
    var preview =  previewFrame.contentDocument ||  previewFrame.contentWindow.document;
    preview.open();
    preview.write(editor.getValue());
    preview.close();
}
setTimeout(updatePreview, 300);

function saveTextAsFile() {
    var textToWrite = document.getElementById("code").value;
    var textFileAsBlob = new Blob([textToWrite], {type:'text/plain'});
    var fileNameToSaveAs = "myfile.html";

    var downloadLink = document.createElement("a");
    downloadLink.download = fileNameToSaveAs;
    downloadLink.innerHTML = "Download File";
    if (window.webkitURL != null)
    {
        // Chrome allows the link to be clicked
        // without actually adding it to the DOM.
        downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
    }
    else
    {
        // Firefox requires the link to be added to the DOM
        // before it can be clicked.
        downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display = "none";
        document.body.appendChild(downloadLink);
    }

    downloadLink.click();}

function destroyClickedElement(event) {
    document.body.removeChild(event.target);}

function loadfile(input){
    var reader = new FileReader()
    reader.onload = function(e) {
        editor.setValue = e.target.result;}
    reader.readAsText(input.files[0]);}

    var input = document.getElementById("select");

    function selectTheme() {
      var theme = input.options[input.selectedIndex].innerHTML;
      editor.setOption("theme", theme);
    }

    var choice = document.location.search &&
               decodeURIComponent(document.location.search.slice(1));
    if (choice) {
      input.value = choice;
      editor.setOption("theme", choice);
    }

Full Code

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>CodeMirror: HTML5 preview</title>
<script src='http://codemirror.net/lib/codemirror.js'></script>
<script src='http://codemirror.net/mode/xml/xml.js'></script>
<script src='http://codemirror.net/mode/javascript/javascript.js'></script>
<script src='http://codemirror.net/mode/css/css.js'></script>
<script src='http://codemirror.net/mode/htmlmixed/htmlmixed.js'></script>
<link rel='stylesheet' href='http://codemirror.net/lib/codemirror.css'>
<link rel='stylesheet' href='http://codemirror.net/doc/docs.css'>
<style type='text/css'>
.CodeMirror {
    float: left;
    width: 50%;
    border: 1px solid black;}

iframe {
    width: 49%;
    float: left;
    height: 300px;
    border: 1px solid black;
    border-left: 0px;}
</style>
</head>
<body>
    <textarea id="code" name="code"><!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>HTML5 canvas demo</title>
<style>p {font-family: monospace;}</style>
</head>
<body>
    <p>Canvas pane goes here:</p>
    <canvas id=pane width=300 height=200></canvas>

    <script>
      var canvas = document.getElementById('pane');
      var context = canvas.getContext('2d');

      context.fillStyle = 'rgb(250,0,0)';
      context.fillRect(10, 10, 55, 50);

      context.fillStyle = 'rgba(0, 0, 250, 0.5)';
      context.fillRect(30, 30, 55, 50);
    </script>
</body>
</html></textarea>

    <iframe id="preview"></iframe>

    <input type="file" onchange="loadfile(this)">
    <a href="#my-header" onclick='saveTextAsFile()'>Save/Download</a>

<script>
var delay;

// Initialize CodeMirror editor
var editor = CodeMirror.fromTextArea(document.getElementById('code'), {
    mode: 'text/html',
    tabMode: 'indent',
    lineNumbers: true,
    lineWrapping: true,
    autoCloseTags: true
});

// Live preview
editor.on("change", function() {
    clearTimeout(delay);
    delay = setTimeout(updatePreview, 300);
});

function updatePreview() {
    var previewFrame = document.getElementById('preview');
    var preview =  previewFrame.contentDocument ||  previewFrame.contentWindow.document;
    preview.open();
    preview.write(editor.getValue());
    preview.close();
}
setTimeout(updatePreview, 300);

function saveTextAsFile() {
    var textToWrite = document.getElementById("code").value;
    var textFileAsBlob = new Blob([textToWrite], {type:'text/plain'});
    var fileNameToSaveAs = "myfile.html";

    var downloadLink = document.createElement("a");
    downloadLink.download = fileNameToSaveAs;
    downloadLink.innerHTML = "Download File";
    if (window.webkitURL != null)
    {
        // Chrome allows the link to be clicked
        // without actually adding it to the DOM.
        downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
    }
    else
    {
        // Firefox requires the link to be added to the DOM
        // before it can be clicked.
        downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
        downloadLink.onclick = destroyClickedElement;
        downloadLink.style.display = "none";
        document.body.appendChild(downloadLink);
    }

    downloadLink.click();}

function destroyClickedElement(event) {
    document.body.removeChild(event.target);}

function loadfile(input){
    var reader = new FileReader();
    reader.onload = function(e) {
        document.getElementById('code').value = e.target.result;}
    reader.readAsText(input.files[0]);}

    var input = document.getElementById("select");

    function selectTheme() {
      var theme = input.options[input.selectedIndex].innerHTML;
      editor.setOption("theme", theme);
    }

    var choice = document.location.search &&
               decodeURIComponent(document.location.search.slice(1));
    if (choice) {
      input.value = choice;
      editor.setOption("theme", choice);
    }
</script>
</body>
</html>

解决方案

You're simply misusing CodeMirror; when the file content is loaded into the reader, instead of assigning a value to the textarea element, e.g.:

reader.onload = function(e) {
    document.getElementById('code').value = e.target.result;
}

… use the CodeMirror API and insert content via the editor instance setValue() method, like so:

reader.onload = function(e) {
    editor.setValue(e.target.result);
}

See the CodeMirror docs for doc.setValue(content: string), and here's the updated, working demo illustrating this.

这篇关于的FileReader和codeMIRROR加载文件并发症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！

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