Inappropriate words Validation with Javascript.
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Monday, August 17, 2009

Inappropriate words Validation with Javascript.

This post about how to block Inappropriate/bad words content with java script validation. Using this script we can stop bad messages/commets updates. It's very simple script take a look live demo and try to submit some bad words.

Inappropriate words Validation with Javascript.

Download Script     Live Demo


badwords.js
Contains javascript code. If you want add some more words in bad_words_array
var bad_words_array=new Array("badword-1","badword-2","badword-3");
function badwords(txt)
{
var alert_arr=new Array;
var alert_count=0;
var compare_text=txt;

for(var i=0; i<bad_words_array.length; i++)
{
for(var j=0; j<(compare_text.length); j++)
{
if(bad_words_array[i]==compare_text. 
substring(j,(j+bad_words_array[i].length)).toLowerCase())
{
alert_count++;
}
}
}
return alert_count;
}




index.html
Contains javascript and HTML code. The form calling Message() function.
<script type="text/javascript" src="badwords.js"></script>
<script type="text/javascript">
function Message()
{
var textbox_val=document.form.textbox.value;
if(textbox_val=="")
{
alert("Please enter a message");
return false;
}

bwords=badwords(textbox_val);
if(bwords>0)
{
alert("Your message contains inappropriate words.
Please clean up your message.");
document.form.textbox.focus();
return false;
}
}
</script>

<form action="thankyou.html" method="post"
onsubmit="return Message();" name="form">
<textarea name="textbox"></textarea>
<input type="submit" value=" Send "/>
</form>

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3 comments:

  1. function badwords(txt)
    {
        txt = txt.toLowerCase();
        var alert_count = 0;
        for(var i = 0, len = bad_words_array.length; i < len; i++)
        {
            if(txt.indexOf(bad_words_array[i]) !== -1)
            {
                alert_count++;
            }
        }
        return alert_count;
    }

    Simpler and more efficient.

    ReplyDelete
  2. Extremely inefficient and basically a bad idea anyway (as it will find bad words in plain words, for example). See http://www.codinghorror.com/blog/archives/001176.html for example for more details. Not to mention it is super-easy to workaround...

    ReplyDelete

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