Question

一旦达到给定数量的单词或字符（不包括空格），我试图限制表单字段中文本框的长度。

我遇到的麻烦是，一旦达到上限，我就无法弄清楚如何限制子串最大长度变量。

我使用Callable.js（https://sacha.me/Countable/docs/）作为计数器脚本。

＆＃13;

var wordL = 3;
    var charL = 18;
    var boxid = 'descr';
    var area = document.getElementById(boxid);
    function fixlength(boxid,wordlimit,charlimit,wordcount,charcount,allcount) {
            if (charcount > charlimit || wordcount > wordlimit) {
                    /******************************
                    * The following line contains the problematic dynamic variable
                    *******************************/
                    area.value = area.value.substring(0, all);                                                                 
            }
    }
    function callback (counter) {
      console.log(counter);
      document.getElementById("wordsleft").innerHTML = wordL - counter.words;
      document.getElementById("charsleft").innerHTML = charL - counter.characters;
      fixlength(boxid,wordL,charL,counter.words,counter.characters,counter.all);
    }
    Countable.live(area, callback);

＆＃13;

<script src="https://raw.githubusercontent.com/RadLikeWhoa/Countable/master/Countable.js"></script>
<!DOCTYPE HTML>
<html>
 <head>
  <title>Test</title>
 </head>
 <body>
  Words:<span id="wordsleft"></span> Chars:<span id="charsleft"></span>
   <form>
     <textarea id="descr" name"descr"></textarea>
     </form>
 </body>
</html>

＆＃13;

达到限制后使数值变量不可变

0 个答案: