I have a text field in ASP.NET and i want to allow only alphanumeric and forward slash (/) keys in that. I tried the following code,
function jsCheckInput(e) { var evt = (e) ? e : window.event; var key = (evt.keyCode) ? evt.keyCode : evt.which; if (key != null) { key = parseInt(key, 10); if (key < 47 || (key > 57 && key < 65) || (key > 90 && key < 97) || key > 122) { if (!jsIsUserFriendlyChar(key)) { return false; } } else { if (evt.shiftKey) { return true; } } } return true; } function jsIsUserFriendlyChar(val) { // Backspace, Tab, Enter, Insert, and Delete if (val == 8 || val == 9 || val == 13 || val == 45 || val == 46) { return true; } // Ctrl, Alt, CapsLock, Home, End, and Arrows if ((val > 16 && val < 21) || (val > 34 && val < 41)) { return true; } return false; }
In the web forms page i added like below,
<asp:TextBox ID="text_value" CssClass="textbox" onkeydown="return jsCheckInput(event);" runat="server"></asp:TextBox>
Here i am able to enter alphabets and numbers but i am not able to enter the value /
. I have enabled the shift key so i can give shift + ?
to enter the forward slash. Also another problem is when i press shift + any numeric key the special characters there like ! @ # $ % ^ & * ( ) ...
are also coming in tet field. What am i doing wrong here?
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Answer
SOLUTION
Finally found a solution as below,
function jsCheckInput(e, t) { try { if (window.event) { var charCode = window.event.keyCode; } else if (e) { var charCode = e.which; } else { return true; } if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123) || (charCode > 46 && charCode < 58)) return true; else if (jsIsUserFriendlyChar(charCode)) return true; else return false; } catch (err) { alert(err.Description); } }
This code works perfectly!!