Count number of lines in multiline asp:textbox using jquery

Question

I used to do this in a desktop app like this:

    private void txtSerials_TextChanged(object sender, EventArgs e)
    {
        //Count serials            
        SerialNumbers = Regex.Split(txtSerials.Text.Trim(), "\r\n");
        lblSerCount.Text = SerialNumbers.Length.ToString();
    }

How can I achieve the same in jquery?

Take a look at: http://stackoverflow.com/questions/3697096/finding-number-of-lines-in-an-html-textarea — Martijn van Put, May 07 '14 at 22:11

score 1 · Accepted Answer · answered May 07 '14 at 22:14

This function translates the functionality from your C# to JavaScript and jQuery:

$("#txtSerials").change(function (e) {
    var serialNumbers = this.value.trim().split(/\n/);
    $("#lblSerCount").text(serialNumbers.length);
});

The trim() method is not supported in IE8 or earlier. You can fix that by including this JavaScript polyfill from MDN:

if (!String.prototype.trim) {
    String.prototype.trim = function () {
        return this.replace(/^\s+|\s+$/g, '');
    };
}

score 0 · Answer 2 · answered May 07 '14 at 22:10

0

var checkthis = $("#IDofyourtextboxhere").val();
var newlines = checkthis.match(/\n/g);
var numberoflines = newlines.length;

answered May 07 '14 at 22:10

shenn

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Count number of lines in multiline asp:textbox using jquery

2 Answers2