CODEWITHSUNDEEP
javascriptjqueryasp.netvb.net
aherigon
aherigon

Reputation: 75

Run code when user presses certain key in a textbox

I have an ASP.net textbox that the user needs to enter emails. I need to detect when the user types a semi-colon(;) then unhide a textbox and set the focus to that textbox.

Upvotes: 0

Views: 98

Answers (2)

scottyeatscode
scottyeatscode

Reputation: 606

Disclaimer: This might seem a little "hacky" and I'm sure there are better ways of doing this.

You can use the onkeypress of the textbox, set that to a JavaScript function. In the JavaScript function, programmatically "unhide" and give focus to your other textbox on the client-side. No post-back required.

JavaScript:

function checkForSemicolons(event) {
    var txtEmail = document.getElementById("<%= txtEmail.ClientID %>");
    if (event.keyCode === 59) {
        // unhide other textbox and give focus to it
    }
}

ASPX:

<asp:TextBox ID="txtEmail" onkeypress="checkForSemicolons(event)" runat="server" />

Upvotes: 2

Felipe C Vieira
Felipe C Vieira

Reputation: 56

OnKeypress event is fired from the client side, so you need do catch that from the client script.

You can use javascript to cause a postback and than send the parameters to the server-side, but usually you can handle all from the client. On jquery you would have somethig like this:

$("TextboxID").keypress(function(e){
     //do something 
     //If you want to cause a postback use " __doPostBack('EventTaarget','Parameters');"
     //you can capture the key that was pressed on e.keycode (for keycodes list, check: http://www.cambiaresearch.com/articles/15/javascript-char-codes-key-codes)

})

On the code behind you can add some code to capture this event on page_load.

 Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
   If Me.Request("__EVENTTARGET") Is Nothing Then
       'do something - you can use the Parameter with: Me.Request("__EVENTARGUMENT")
   end if

end sub

Upvotes: 0

Related Questions