Question

<asp:TextBox CssClass="txt" ID="TextBox1" runat="server"
             onkeyup="CountChars(this);" Rows="20" Columns="35" 
             TextMode="MultiLine" Wrap="true">
</asp:TextBox>

I need to implement word-wrapping in a multi-line textbox. I cannot allow users to write more then 35 chars a line. I am using the following code, which breaks at precisely the specified character on every line, cutting words in half. Can we fix this so that if there’s not enough space left for a word on the current line, we move the whole word to the next line?

function CountChars(ID) {
    var IntermediateText = '';
    var FinalText = '';
    var SubText = '';
    var text = document.getElementById(ID.id).value;
    var lines = text.split("\n");
    for (var i = 0; i < lines.length; i++) {
        IntermediateText = lines[i];
        if (IntermediateText.length <= 50) {
            if (lines.length - 1 == i)
                FinalText += IntermediateText;
            else
                FinalText += IntermediateText + "\n";
        }
        else {
            while (IntermediateText.length > 50) {
                SubText = IntermediateText.substring(0, 50);
                FinalText += SubText + "\n";
                IntermediateText = IntermediateText.replace(SubText, '');
            }
            if (IntermediateText != '') {
                if (lines.length - 1 == i)
                    FinalText += IntermediateText;
                else
                    FinalText += IntermediateText + "\n";
            }
        }
    }
    document.getElementById(ID.id).value = FinalText;
    $('#' + ID.id).scrollTop($('#' + ID.id)[0].scrollHeight);
}

Edit – 1

I have to show total max 35 characters in line without specific word break and need to keep margin of two characters from the right. Again, the restriction should be for 35 characters but need space for total 37 (Just for the Visibility issue.)

Answer 1

<script type="text/javascript">
    function CountChars(ID) {
        var IntermediateText = '';
        var FinalText = '';
        var SubText = '';
        var Splitted;
        var Concatenated;
        var text = document.getElementById(ID.id).value;
        var lines = text.split("\n");
        for (var i = 0; i < lines.length; i++) {
            IntermediateText = lines[i];
            if (IntermediateText.length <= 50) {
                if (lines.length - 1 == i)
                    FinalText += IntermediateText;
                else
                    FinalText += IntermediateText + "\n";
            }
            else {
                Splitted = IntermediateText.split(' ');
                for (var index = 0; index < Splitted.length; index++) {
                    Concatenated = Splitted[index].length;
                    if (Concatenated + SubText.length <= 50) {
                        if (index + 1 != Splitted.length) {
                            SubText += Splitted[index] + " ";
                        }
                        else {
                            SubText += Splitted[index];
                        }
                    }
                    else {
                        FinalText += SubText + "\n";
                        SubText = "";
                        if (index + 1 != Splitted.length) {
                            SubText = Splitted[index] + " ";
                        }
                        else {
                            SubText = Splitted[index];
                        }
                    }
                }
                if (SubText != '') {
                    FinalText += SubText;
                }
            }
        }
        document.getElementById(ID.id).value = FinalText;
        $('#' + ID.id).scrollTop($('#' + ID.id)[0].scrollHeight);
    }

</script>


<asp:TextBox ID="txt" onkeyup="CountChars(this);" Width="60%" runat="server" Rows="20"
                    Columns="50" TextMode="MultiLine" MaxLength="1000"></asp:TextBox>