windows.event is undefined in firefox browser how to resolve

Question

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hi to all,
Here i using this below script to validate mobile and email but it work in all browser expect firefox got error "

window.event is undefined

"

Script:-

C#

function CheckMode() {
    var ctr = document.getElementById('ctl00_cplhControlPanel_frmViewAdd_tablInsert_tabInsMain_drpModeofContactAdd');
    var ctrMobile = document.getElementById('ctl00_cplhControlPanel_frmViewAdd_tablInsert_tabInsMain_txtMobileAdd');
    var ctrEmail = document.getElementById('ctl00_cplhControlPanel_frmViewAdd_tablInsert_tabInsMain_txtEmailIdAdd');
    var txt = ctr.value;
    var Mobile = ctrMobile.value;
    var Email = ctrEmail.value;

    if (txt == "1") {
        if (Mobile == "") {
            alert("Enter Mobile Number");
            Page_IsValid = false;
            return window.event.returnValue = false;
        }
    }
    else if (txt == "2") {
        if (Email == "") {
            alert("Enter Email Id");
            Page_IsValid = false;
            return window.event.returnValue = false;
        }
    }
    else {
        Page_IsValid = true;
    }
}

button:-

XML

<asp:Button ID="InsertButton" TabIndex="17" CssClass="savebutton1231" EnableTheming="false"
                                                                                    runat="server" CausesValidation="True" CommandName="Insert" SkinID="skinBtnSave"
                                                                                    OnClientClick="CheckMode();" OnClick="InsertButton_Click"></asp:Button>

Kindly help me for this task i need to work in all browser.Thanks in advance.

Posted 13-Jul-15 20:54pm

JOTHI KUMAR Member 10918227

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Thomas Daniels · Answer 1 · 2015-07-13T21:09:00

Solution 1

window.event does not exist in Firefox. Try adding a parameter e to your CheckMode function, then change OnClientClick to CheckMode(event);. That will pass the event to CheckMode.

You can also add a line e = e || window.event; to your function that gives e the value of window.event, in case the parameter e passed to CheckMode is undefined but window.event is not.

JavaScript

function CheckMode(e) {
    e = e || window.event;
    ...

ASP.NET

<asp:Button ID="InsertButton" TabIndex="17" CssClass="savebutton1231" EnableTheming="false" runat="server" CausesValidation="True" CommandName="Insert" SkinID="skinBtnSave" OnClientClick="CheckMode(event);" OnClick="InsertButton_Click"></asp:Button>

Posted 13-Jul-15 21:09pm

Thomas Daniels

Updated 13-Jul-15 21:14pm

v2

Comments

JOTHI KUMAR Member 10918227 14-Jul-15 3:11am

i done this but this will not work me i got event is undefined.this is form view

Thomas Daniels 14-Jul-15 3:13am

Where did you get that? At what line?

Sergey Alexandrovich Kryukov 14-Jul-15 3:13am

No, you haven't done it properly!
—SA

Thomas Daniels 14-Jul-15 3:14am

I updated my solution by the way, "this" didn't appear to work in Firefox while "event" did. You might want to try again.

Sergey Alexandrovich Kryukov 14-Jul-15 3:14am

5ed. See also Solution 2 for information on some a bit different aspects.
—SA

Thomas Daniels 14-Jul-15 3:15am

Thank you!

JOTHI KUMAR Member 10918227 14-Jul-15 3:49am

firefox ->console tab

Thomas Daniels 14-Jul-15 4:03am

What line of your code does it point at? I believe the console has a link for that.

Sergey Alexandrovich Kryukov · Answer 2 · 2015-07-13T21:12:00

You should never use this property; it does not exist in standard. Please see: https://developer.mozilla.org/en-US/docs/Web/API/Window[^].

This property probably only exist in IE, and it reflects the big conceptual technology abuse: passing the event information through outer context, so this object is only defined when the event is invoked. The whole idea to use such unreliable technique is badly wrong, but who tells that anything implemented in IE can be trusted?

The correct approach is to pass event object as the first argument of a handler. This is the simplest example:

HTML

<button onclick="myHandler(event)">Some Button</button> <!-- use this exact name, "event" -->

In JavaScript, you may have

C#

function myHandler(eventInstance) {
   // use eventInstance here
}

With click, you don't have any essential information, but with mouse or keyboard events you can get mouse coordinates, or key data, and so on. Please see: https://developer.mozilla.org/en-US/docs/Web/API/Event[^].

Try to use correct standard techniques, never buy IE provocations. :-)

—SA