Question

我尝试在给定的javascript中为html-textarea添加char限制器。此外，我想添加一个剩余计数器。但我的代码无效。

你有一个想法，我错了吗？

maxLen=640;
if(text.length>maxLen)
{document.getElementById("message").value=text.substring(0,maxLen);}

else
{document.getElementsByClassName("totalcounter").value=maxLen-text.length;}

Demo on jsfiddle - ＆gt;我的问题是第62-70行。

Answer 1

你尝试过textarea的属性maxlength吗？

<textarea maxlength="50">

Answer 2

让代码正常工作，移动if if else阻止＆＃34;返回＆＃34;（如下所示）并使用document.getElementsByClassName("totalcounter")[0].innerHTML=maxLen-text.length;代替document.getElementsByClassName("totalcounter").value=maxLen-text.length;

maxLen=640;
        if(text.length>maxLen)
    {
        document.getElementById("message").value=text.substring(0,maxLen);
    }
        else
    {
        document.getElementsByClassName("totalcounter")[0].innerHTML=maxLen-text.length;
    }     
  return count = {
    encoding: encoding,
    length: length,
    per_message: per_message,
    remaining: remaining,
    messages: messages
  };

working JSfiddle

Answer 3

我的解决方案如下：

限制5条消息后的短信（在手机上显示为1）并添加剩余的总计数

<!-- maxLen GSM7: 765 chars = 5 Messages
<!-- maxLen GSM7EX: 765 chars - (number of used "gsm7bitExChar"-Chars * 2)= 5 Messages  
<!-- maxLen UTF16: 335 chars = 5 Messages     

if(encoding == 'GSM_7BIT'){
     maxLen=764;

if(text.length>maxLen)
{
  document.getElementById("message").value=text.substring(0,maxLen);
}
else
{
  document.getElementsByClassName("totalcounter")[0].innerHTML=maxLen-text.length;
}   

  return count = {
    encoding: encoding,
    length: length,
    per_message: per_message,
    remaining: remaining,
    messages: messages
    }

}; <!-- close if encoding 1

  if(encoding == 'GSM_7BIT_EX'){
    maxLen=762;

if(text.length>maxLen)
{
  document.getElementById("message").value=text.substring(0,maxLen);
}
else
{
  document.getElementsByClassName("totalcounter")[0].innerHTML=maxLen-text.length;
}   

  return count = {
    encoding: encoding,
    length: length,
    per_message: per_message,
    remaining: remaining,
    messages: messages
    }

};<!-- close if encoding 2

if(encoding == 'UTF16'){
    maxLen=334;

 if(text.length>maxLen)
{
  document.getElementById("message").value=text.substring(0,maxLen);
}
else
{
  document.getElementsByClassName("totalcounter")[0].innerHTML=maxLen-text.length;
}   

  return count = {
    encoding: encoding,
    length: length,
    per_message: per_message,
    remaining: remaining,
    messages: messages
    }

};<!-- close if encoding 3

希望这也有助于其他人。的 Solution on jsfiddle

特别感谢danxexe

限制sms-chars＆amp;在textarea计数

3 个答案: