Character Counter

JavaScriptSource Staff Mar 28, 2005

General

Use this script to limit the number of characters allowed in an input box. It will display the number of characters left. Easy to modify.

Notes

Created by: Steve
Web Site: http://jsmadeeasy.com/
Posted: March 28, 2005

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: characterCounter.js

/* This script and many more are available free online at
The JavaScript Source!! http://www.javascriptsource.com
Created by: Steve | http://jsmadeeasy.com/ */
function getObject(obj) {
  var theObj;
  if(document.all) {
    if(typeof obj=="string") {
      return document.all(obj);
    } else {
      return obj.style;
    }
  }
  if(document.getElementById) {
    if(typeof obj=="string") {
      return document.getElementById(obj);
    } else {
      return obj.style;
    }
  }
  return null;
}

function toCount(entrance,exit,text,characters) {
  var entranceObj=getObject(entrance);
  var exitObj=getObject(exit);
  var length=characters - entranceObj.value.length;
  if(length <= 0) {
    length=0;
    text='<span class="disable"> '+text+' </span>';
    entranceObj.value=entranceObj.value.substr(0,characters);
  }
  exitObj.innerHTML = text.replace("{CHAR}",length);
}

CSS

Paste this code into your external CSS file or in the <style> section within the HEAD section of your HTML document.

.minitext {
  font: normal 0.7em Arial, sans-serif;
  color: Black;
}

.disable {
  background-color: #CF110C;
  color: #fff;
  font-weight: bold;
  padding: 5px;
}

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="characterCounter.js"></script>

Body

Paste this code into the BODY section of your HTML document


<div id="overDiv" style="position:absolute; visibility:hidden; z-index:1000;"></div>
<form action="#" method="post">
<table align="center" border="0" cellspacing="1" cellpadding="5">
  <tr>
    <td align="right"><span class="options">Field Name</span></td>
    <td class="2">
      <input type="text" id="eBann" name="bannerURL" maxlength="100" size="60" onKeyUp="toCount('eBann','sBann','{CHAR} characters left',100);">
      <br/>
      <span id="sBann" class="minitext">100 characters left.</span>
    </td>
  </tr>
</table>
</form>

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