编辑,保存,自修改HTML文档;格式生成的HTML,JavaScript

时间:2015-05-31 21:59:21

标签: javascript html html5 self-modifying

动机:https://stackoverflow.com/questions/28120689/create-self-modifying-html-page-on-box

错误:字符串转义,格式化htmljs由初始修改后生成,已保存htmljs

例如,

a)如果打开" saveFile.html"在本地浏览器;

b)输入" abc"进入textarea;

c)点击save file按钮;

d)点击Save对话框中的Save File;

e)file-*[date according to universal time].html保存到磁盘;

f)在浏览器中打开file-*[date according to universal time].html;

g)类型" def"进入textarea;

h)重复d),e),f);

i)错误:第二个file-*[date according to universal time].html的结果显示textarea包含" abc def"文字内容; button显示html

// at rendered `html` from second `file-*[date according to universal time].html`
// `textarea` containing "abc def" displayed here , 
// `button` _not_ displayed ; following string displayed following `textarea`:
');"console.log(clone);var file = new Blob([clone], {'type':'text/html'});a.href = URL.createObjectURL(file);a.download = 'file-' + new Date().getTime() + '.html';a.click();};

生成 26 ," saveFile.html"

+ "var clone = '<!doctype html>'+ document.documentElement.outerHTML.replace(/<textarea>.*<.+textarea>/, '<textarea>'+document.getElementsByTagName('textarea')[0].value+'<\/textarea>');"

&#34; saveFile.html&#34; v 1.0.0

html,js

<!doctype html>
<html>
<!-- saveFile.html 1.0.0 2015 guest271314 edit, save `html` document -->
<head>
</head>
<body>
<textarea>
</textarea>
<button>save file</button>
<script type="text/javascript">
var saveFile = document.getElementsByTagName("button")[0];
var input = document.getElementsByTagName("textarea")[0];
var a = document.createElement("a");

saveFile.onclick = function(e) {

  var clone = ["<!doctype html><head></head><body><textarea>"
              + input.value
              + "</textarea>"
              + "<button>save file</button>"
              + "<script type='text/javascript'>"
              + "var saveFile = document.getElementsByTagName('button')[0];"
              + "var input = document.getElementsByTagName('textarea')[0];"
              + "var a = document.createElement('a');"
              + "saveFile.onclick = function(e) {"
              + "var clone = '<!doctype html>'+ document.documentElement.outerHTML.replace(/<textarea>.*<.+textarea>/, '<textarea>'+document.getElementsByTagName('textarea')[0].value+'<\/textarea>');"
              + "console.log(clone);"
              + "var file = new Blob([clone], {'type':'text/html'});"
              + "a.href = URL.createObjectURL(file);"
              + "a.download = 'file-' + new Date().getTime() + '.html';"
              + "a.click();"
              + "};"
              + "</scr"+"ipt>"
              + "</body>"
              + "</html>"];

  var file = new Blob([clone], {"type":"text/html"});  
  a.href = URL.createObjectURL(file);
  a.download = "file-" + new Date().getTime() + ".html";
  a.click();  

};
</script>
</body>
</html>

2 个答案:

答案 0 :(得分:1)

替换功能将替换为/textarea>变量中的clone。它不是从第一个文件中执行的,因为在html中的textarea之后有一个换行符。修复它的一种方法是在生成的html中添加newline字符。像这样:

var clone = ["<!doctype html><head></head><body><textarea>"
          + input.value
         // add newline here
          + "</textarea>\n"
          + "<button>save file</button>"
          + "<script type='text/javascript'>"
          + "var saveFile = document.getElementsByTagName('button')[0];"
          + "var input = document.getElementsByTagName('textarea')[0];"
          + "var a = document.createElement('a');"
          + "saveFile.onclick = function(e) {"
          + "var clone = '<!doctype html>'+ document.documentElement.outerHTML.replace(/<textarea>.*<.+textarea>/, '<textarea>'+document.getElementsByTagName('textarea')[0].value+'<\/textarea>');"
          + "console.log(clone);"
          + "var file = new Blob([clone], {'type':'text/html'});"
          + "a.href = URL.createObjectURL(file);"
          + "a.download = 'file-' + new Date().getTime() + '.html';"
          + "a.click();"
          + "};"
          + "</scr"+"ipt>"
          + "</body>"
          + "</html>"];

答案 1 :(得分:1)

我不确定是什么打破了第三代克隆,因此导致js信息输出到页面,但使用实际文档对象来克隆/操作原始文件可能会更好并将其内容输出为Blob对象的字符串。例如,我使用您的基本saveFile.html进行了测试,并进行了以下更改:

//remove original clone var and replace with:
var clone = document.cloneNode(true);

// grab textarea elements from both original document and clone:
var doc_input = document.getElementsByTagName("textarea")[0];
var clone_input = clone.getElementsByTagName("textarea")[0];

// set clone textarea's innerHTML to current textarea value:
clone_input.innerHTML = doc_input.value;

// use outerHTML of clone.documentElement to get string for Blob
var clone_string = [clone.documentElement.outerHTML];
var file = new Blob([clone_string], {"type":"text/html"});

我看到的唯一缺点是:

  1. 这可能很难扩展到更通用的框架,用于生成&#34;实时HTML文件&#34;加载HTML页面的当前状态(尽管它不应该比您的示例方法更复杂)。

  2. clone.documentElement.outerHTML返回的字符串似乎将文档类型声明放到一个简单元素中,以便:

  3. 不在输出字符串中。你可以使用类似的东西:

    var clone_string = ["<!doctype html>" + clone.documentElement.outerHTML];
    

    作为解决方法。或者,对于更强大的东西:

    var doc_doctype = new XMLSerializer().serializeToString(document.doctype);
    
    var clone_string = [doc_doctype + clone.documentElement.outerHTML];