html - how to get the html text length without set it to a textfield?

Question

in actionscript ,i didn't find a direct way to get the actually string's length of a html text.here's how i get things work

var myText:String = "<p>This is <b>some</b> content to <i>render</i> as <u>HTML</u> text.</p>"; 
myTextBox.htmlText = myText;
trace(myTextBox.length);

deal with large content of html text would be a performance problem.

is there a way i can get the length while i don't have to pass it to a text device?

Answer 1

我看到了两种从 xml 中提取文本的方法：

1. 最好的xHTML方法是将其解析为 XML 并提取所有文本节点

2. 对于所有类型的文本，您可以尝试RegExp匹配不属于 HTML 标记的文本 ( http://regexr.com?363li )

   var s:String = "<p>This is <b>some</b> content to <i>render</i> as <u>HTML</u> text.</p>";
   
   //by TextField
   var tf:TextField = new TextField();
   tf.htmlText = s;
   trace(tf.text);
   trace(tf.length);
   
   //well-formed XML
   XML.ignoreWhitespace = false;
   var x:XML = new XML(s);
   
   var t:String = "";
   var list:XMLList = x..*;
   for each(var node:XML in list)
       if(node.nodeKind() == "text")
           t += node;
   
   trace(t);
   trace(t.length);
   
   //by RegExp (non wel formed XML)
   var match:Array = s.match(/(?<=^|>)[^><]+?(?=<|$)/gs);
   s = match.join("");
   trace(t);
   trace(t.length);
   

输出：

22528
21  ms
22528
35  ms
22528
20  ms

但是所有这些技术在性能上似乎几乎相等，正如您可以看到对于具有 22k 个字符的字符串，所有方法在 20-30 毫秒内以几乎相同的结果运行，但无论如何您都可以尝试这两种方法作为输入。