Grabbing single ASCII values pasted into a text area

Kermit Piper · Mar 10, 2006

Hello,

OK, almost there. Here's what I have so far, which handles characters
as they're typed in. Could someone please show me how I would loop
through all the values that are entered if a block of text was pasted
in, and then grab the ascii value(s) that are > 128?:

<script type="text/javascript">
function toASCII(s)
{
var r = [];
for (var i=0, j=s.length; j--; i++){
r = s.charCodeAt(i);
if (r > 128)
{
alert('"' + String.fromCharCode(r) + '"' + " Is not an acceptable
character.");
document.form1.textarea1.value="";
document.form1.textarea1.focus();
return false;
}
else
{
return true;
}
}
//return r.join(' ');
}
</script>

<BODY>
<form name="form1">
<textarea name="textarea1" onBlur="toASCII(this.value);"></textarea>


<br>
<div>ASCII character codes

</div>
<input type=reset value="clear" onClick="document.form1.reset()">
</form>
</BODY>

Thanks in advance,
KP

Thomas 'PointedEars' Lahn · Mar 12, 2006

Kermit said:
OK, almost there. Here's what I have so far, which handles characters
as they're typed in. Could someone please show me how I would loop
through all the values that are entered if a block of text was pasted
in, and then grab the ascii value(s) that are > 128?:

There are no "ASCII values" beyond code point 127, ASCII is a 7-bit code.
And most certainly you mean > 127.

<script type="text/javascript">
function toASCII(s)

See above.

{
var r = [];
for (var i=0, j=s.length; j--; i++){

The value of `i' will be always what s.length-j evaluates to, so one of both
variables is redundant.

r = s.charCodeAt(i);

OK, you are creating a new array element with the value of the code of the
character at position `i'.

if (r > 128)

Click to expand...

But `r' refers to an Array object. It cannot work this way.

{
alert('"' + String.fromCharCode(r) + '"' + " Is not an acceptable

Click to expand...

It would be more simple/easier/better if you just used s.charAt(i) here.

character.");

Click to expand...

Use multiples of two spaces to indent your code, not the Horizontal Tab
character. Avoid code that exceeds the 80-columns margin, especially when
posting it; 72 or 76 are good numbers. IIRC there is a documentation
standard that even calls for word wrap after column #67.

document.form1.textarea1.value="";
document.form1.textarea1.focus();

Click to expand...

See below.

return false;
}
else
{
return true;
}
}
//return r.join(' ');
}
</script>

<BODY>
<form name="form1">

Click to expand...

The `action' attribute is missing.

<textarea name="textarea1" onBlur="toASCII(this.value);"></textarea>

Click to expand...

Do not validate `onblur'. Use a button to validate instead. That can also
be a submit button in which case you would use the `onsubmit' handler of
the `form' element instead of the `onclick' handler of the button.

Pass `this' instead of `this.value', and you can use the `form' property
(or the passed reference itself, if called from an event handler for the
`form' element), coding standards compliant and avoiding any dependency
on the `form' element's name.

Search the archives for "form validation".

[...]
<input type=reset value="clear" onClick="document.form1.reset()">

Click to expand...

The `onclick' code here is nonsense, since it is already a reset
button (input[type=reset]). Remove the entire attribute.

PointedEars

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Grabbing single ASCII values pasted into a text area

Kermit Piper

Thomas 'PointedEars' Lahn

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