Text Trimmer

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Utility functions to trim left or right white spaces are provided.

Head Code:

<script>
// Trims all spaces to the left of a specific string
function LTrim(str)
{
        var whitespace = new String(" tnr ");
        // last space character is not a space, but alt+0160,
        // another invisible char.
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(0)) != -1) {
            // We have a string with leading blank(s)...
            var j=0, i = s.length;
            // Iterate from the far left of string until we
            // don't have any more whitespace...
            while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
                j++;
            // Get the substring from the first non-whitespace
            // character to the end of the string...
            s = s.substring(j, i);
        }
        return s;
}
// Trims all spaces to the right of a specific string
function RTrim(str)
{
        // We don't want to trip JUST spaces, but also tabs,
        // line feeds, etc.  Add anything else you want to
        // "trim" here in whitespace
        var whitespace = new String(" tnr ");
        // last space character is not a space, but alt+0160,
        // another invisible char.
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
            // We have a string with trailing blank(s)...
            var i = s.length - 1;       // Get length of string
            // Iterate from the far right of string until we
            // don't have any more whitespace...
            while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
                i--;
            // Get the substring from the front of the string to
            // where the last non-whitespace character is...
            s = s.substring(0, i+1);
        }
        return s;
}
                                                                                                                        
// Trims all spaces to the left and right of a specific string by calling RTim
// and LTrim
function Trim(str)
{
        return RTrim(LTrim(str));
}
</script>

Body Code:

<form name=f1ex>
<input type=text name=t1 value="     A TEST      "><BR>
<input type=button value="Right Trim"
onclick="this.form.t2.value=RTrim(this.form.t1.value)">
<input type=button value="Left Trim"
onclick="this.form.t2.value=LTrim(this.form.t1.value)">
<input type=button value="Trim Left and Right"
onclick="this.form.t2.value=Trim(this.form.t1.value)"><BR>
<input type=text name=t2 value="-press a button above-">
</form>

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