Japanese Zenkaku to Hankaku Roomaji Converter

This is an example of a function used to convert Japanese Zenkaku roomaji to Hankaku roomaji.

Enter Zenkaku or a combination of Zenkaku and Hankaku in the textbox below and the function will output Hankaku. This was designed to convert to Hankaku upon form submission.

Here we can input any UTF-8 character and the function will return the character code

Here we can input any UTF-8 character code and the function will return the character

You can copy the page html from the textarea below and save it to your local system.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

<title>Zenkaku to Hankaku</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />

var checkArray=new Array(2)
checkArray[0]='strEmail'
checkArray[1]='strEmail2'

//here we set the number of array elements
//form form1 only contains strEmail so length is 1
maxElement=(cForm=='shipping'?2:1)

//here we cycle through the array of text-object names
for (i=0;i<maxElement;i++){
	var objTemp=document.forms[cForm].elements[checkArray[i]]
	var cTemp=objTemp.value
	var cString=''
	//here we cycle through the characters in the textbox value
	for (j=0;j<cTemp.length;j++){
		var nChar = cTemp.charCodeAt(j)
		//here we do the unicode conversion from zenkaku to hankaku roomaji
		nChar=( (nChar>=65281 &&  nChar<=65394)?nChar-65248:nChar)
		//MS IME seems to put this character in as the hyphen from keyboard but not numeric pad...
		nChar=( nChar==12540?45:nChar)
		//this is for spaces
		nChar=( nChar==12288?32:nChar)
		nChar=(nChar==32?-1:nChar)
		//this is for commas
		nChar=(nChar==44?46:nChar)
		//this rebuilds the string, ignoring spaces (given charcode -1)
		cString=cString+(nChar==-1?'':String.fromCharCode(nChar))
		}	
	//here we output the string to the textbox	
	objTemp.value=cString
	}
}
//-->
</script>

</head>

<body>
<div id="main">

<h1>Japanese Zenkaku to Hankaku Roomaji Converter</h1>
<p>This is an example of a function used to convert Japanese Zenkaku roomaji to Hankaku roomaji.<p />
<p>Enter Zenkaku or a combination of Zenkaku and Hankaku in the textbox below and the function will output Hankaku.</p>
<form name="form1" method="post" onsubmit=uniConvert('form1') action="generic_form_processor.php">
<span>Text</span>  <input type="text"  name="strEmail" size="30" /><input type="submit" value="Submit" />
</form>
<br />
<p>Here we can input any UTF-8 character and the function will return the character code<br />
<input id="uni_input" /><button onclick="document.getElementById('uni_output').value=document.getElementById('uni_input').value.charCodeAt(0)">show code >></button> <input id="uni_output" />
</p>
<p>Here we can input any UTF-8 character code and the function will return the character<br />
<input id="code_input" /><button onclick="document.getElementById('code_output').value=String.fromCharCode(document.getElementById('code_input').value)">show character >></button> <input id="code_output" /></p>

</body>