JavaScript characters

**dj4uk** · Feb 13th, 2004, 07:11 AM

I have a string that I'd like to replace all characters other than A-Z, a-z and 0-9 with enchar### where ### is the ascii code for the character e.g. 42 = *.

RegExp seems to be the way to go but I'm not sure how to use it to do this.

Any help appreciated.

DJ

**Acidic** · Feb 13th, 2004, 07:23 AM

let me just see if I get what you mean.
this is me(
would become:
thisenchar(ASCII for space)isenchar(ASCII for space)me(ASCII for open bracket)?

**dj4uk** · Feb 13th, 2004, 07:25 AM

You are a *

would become:

You are a enchar042

or even

You are a enchar42

I'm not too bothered about the leading zero.

HTH

**Acidic** · Feb 13th, 2004, 07:34 AM

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>::Acid</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript">
function doIt(me) {
string = me.value
output = ""
regexp = /\w/gi
space = " "
for (i=0; i<string.length; i++)
	{
	if (string.substr(i,1).search(regexp) == 0 || string.substr(i,1).search(space) == 0)
		{
		output += string.substr(i,1)
		}
	else
		{
		output += "enchar"+string.charCodeAt(i)
		}
	}
me.value = output
}
</script>
</head>

<body>
<input name="myTxt" type="text" id="myTxt" onBlur="doIt(this)">
</body>
</html>

**dj4uk** · Feb 13th, 2004, 07:46 AM

Blimey that was quick!

Thanks I'll give it go!

DJ

**Acidic** · Feb 13th, 2004, 07:52 AM

was it how you wanted it?

**dj4uk** · Feb 13th, 2004, 07:59 AM

It works absolutely perfectly apart from for some reason it doesn't encode _ (underscore) - any ideas why?

**Acidic** · Feb 13th, 2004, 08:00 AM

because /w (in the regexp) hold A-Z,a-z,1-9 and _.

You could make another IF function, if it is an underscore, then add the charCode of it there.

**dj4uk** · Feb 13th, 2004, 10:32 AM

Excellent thanks for all your help.

DJ

**dj4uk** · Feb 13th, 2004, 11:10 AM

Acidic thanks for all your help again.

My code in full is now:

Code:

function encode_special_characters(formname) {

	var totalElements = window.document.forms[formname].elements.length;
	
	for (elementNumber = 0; elementNumber < totalElements; elementNumber++) {
		if (window.document.forms[formname].elements[elementNumber].type == "text" || window.document.forms[formname].elements[elementNumber].type == "textarea") {
			inText = window.document.forms[formname].elements[elementNumber].value;
			outText = "";
			regexp = /\w/gi;
			space = " ";
			for (i=0; i < inText.length; i++) {
				if ((inText.substr(i,1).search(regexp) == 0 || inText.substr(i,1).search(space) == 0) && !inText.substr(i,1).search("_") == 0) {
					outText += inText.substr(i,1);
				} else {
					outText += "enchar" + inText.charCodeAt(i);
				}
			}
			window.document.forms[formname].elements[elementNumber].value = outText;
		}
	}
}

Which works perfectly.

Thanks again.

DJ

**Acidic** · Feb 13th, 2004, 11:16 AM

no problem

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