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JavaScript Form Filter

Posted on 2007-04-03
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Last Modified: 2012-05-05
I have a form that has a validator to make sure certain fields are filled in. Now I need a filter to make sure a list of certain words cannot be used, such as swear words.

I need it to check the whole form, which as many fields. How can I do this?
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Question by:Nitestarz
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3 Comments
 
LVL 28

Expert Comment

by:TName
ID: 18845475
This will alert for every "bad" wor it has found. In this example, bad words are bad1, bad2, xxx, yyy, zzz.
Fill the array "bad" with bad words. The example is not case sensitive:


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script>
function checkIt() {

      var bad = new Array('bad1','bad2','xxx','yyy','zzz');

      var count=0;
      var fields=document.getElementsByTagName('INPUT');
      for (var i=0;i<fields.length;i++)   {
          if ((fields[i].type=='text')&&(fields[i].value!=''))
              for (var j=0; j<bad.length;j++)   {
                   if (fields[i].value.toLowerCase()==bad[j].toLowerCase())   {
                       alert(bad[j]+'  not allowed');
                       count++;
                  }
              }
      }
    if (count>0)
       return false;
    else
       return true;
}
</script>
</head>
<body>
<form>
<input type="text">
<input type="text">
<input type="text">
</form>
<input type="button" onClick="checkIt();">
</body>
</html>
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LVL 28

Accepted Solution

by:
TName earned 500 total points
ID: 18845514
And if you want only one alert, regardless of how many bad words are found, change the code to something like this:
(it will only alert for the first "bad" word)


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script>
function checkIt() {

      var bad = new Array('bad1','bad2','xxx','yyy','zzz');

      var fields=document.getElementsByTagName('INPUT');
      for (var i=0;i<fields.length;i++)   {
          if ((fields[i].type=='text')&&(fields[i].value!=''))
              for (var j=0; j<bad.length;j++)   {
                   if (fields[i].value.toLowerCase()==bad[j].toLowerCase())   {
                       alert('\"'+bad[j]+'\"'+'  not allowed!');
                       return false;
                  }
              }
      }
       return true;
}
</script>
</head>
<body>
<form>
<input type="text">
<input type="text">
<input type="text">
</form>
<input type="button" onClick="checkIt();">
</body>
</html>
0
 
LVL 28

Expert Comment

by:TName
ID: 18845560
If you want to check only the fields on the form, not in the entire document, you can change
   var fields=document.getElementsByTagName('INPUT');
to
   var fields=document.form1.getElementsByTagName('INPUT');
where "form1" would be your form's name.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script>
function checkIt() {

      var bad = new Array('bad1','bad2','xxx','yyy','zzz');

      var fields=document.form1.getElementsByTagName('INPUT');
      for (var i=0;i<fields.length;i++)   {
          if ((fields[i].type=='text')&&(fields[i].value!=''))
              for (var j=0; j<bad.length;j++)   {
                   if (fields[i].value.toLowerCase()==bad[j].toLowerCase())   {
                       alert('\"'+bad[j]+'\"'+'  not allowed!');
                       return false;
                  }
              }
      }
       return true;
}
</script>
</head>
<body>
<form name="form1">
<input type="text">
<input type="text">
<input type="text">
</form>
<input type="button" onClick="checkIt();">
</body>
</html>
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