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Show Tooltip or Invalid Icon on MaxLength?

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Justavian
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Justavian asked on 12 Aug 2012, 02:32 PM
What's the best way to notify the user that they've arrived at the maximum length supported by a particular field?  Will i have to use a key up function and test the length, or is there some alternate method i might use?  It doesn't appear that there is anything built in - is there something i missed?

-RP

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Eyup
Telerik team
answered on 15 Aug 2012, 11:28 AM
Hello Rich,

Please try the following approach:
  mark-up:
<telerik:RadTextBox ID="RadTextBox1" runat="server" MaxLength="2"
ClientEvents-OnKeyPress="keyPressed"></telerik:RadTextBox>
  JavaScript:
function keyPressed(sender, args) {
    var currentText = sender.get_textBoxValue();
    setTimeout(checkText, 1, [currentText, sender.get_id()])
}
function checkText(arguments) {
    var oldText = arguments[0];
    var newText = $find(arguments[1]).get_textBoxValue();
    if (oldText == newText) {
        alert("Max length reached");
    }
}

In addition, you could use a more user-friendly message form control instead of alert, for example RadWindow, RadTooltip, RadMenu, etc.

I hope this will prove helpful.

All the best,
Eyup
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Eyup
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