IE10 sending image button click coordinates with decimals (floating point values) causing a ParseInt32 FormatException

Question

It seems like ASP.NET 4.0 is not prepared to handle ImageButton events triggered by Internet Explorer 10. The problem is that IE10 sends the image click coordinates as doubl

Answer 1

There are hotfixes for .NET CLR 2.0 and 4.0, as described in this blog entry by Scott Hanselmann:

What the fixes do is update the ie.browser and firefox.browser files in \Windows\Microsoft.NET\Framework\\Config\Browsers with new and future-proofed versions of these browser definitions. Nothing else is affected.

.NET 4

• http://support.microsoft.com/kb/2600088

.NET 2.0

• http://support.microsoft.com/kb/2600100 for Win7 SP1/Windows Server 2008 R2 SP1, Windows Vista/Server 2008, Windows XP/Server 2003

• http://support.microsoft.com/kb/2608565 for Win7/Windows Server 2008 R2 RTM

Alternatively, there's a client-based javascript patch (originally posted as workaround on the Connect item with bug ID:755419):

$(function () {
    // Patch fractional .x, .y form parameters for IE10.
    if (typeof (Sys) !== 'undefined' && Sys.Browser.agent === Sys.Browser.InternetExplorer && Sys.Browser.version === 10) {
        Sys.WebForms.PageRequestManager.getInstance()._onFormElementActive = function Sys$WebForms$PageRequestManager$_onFormElementActive(element, offsetX, offsetY) {
            if (element.disabled) {
                return;
            }
            this._activeElement = element;
            this._postBackSettings = this._getPostBackSettings(element, element.name);
            if (element.name) {
                var tagName = element.tagName.toUpperCase();
                if (tagName === 'INPUT') {
                    var type = element.type;
                    if (type === 'submit') {
                        this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                    }
                    else if (type === 'image') {
                        this._additionalInput = encodeURIComponent(element.name) + '.x=' + Math.floor(offsetX) + '&' + encodeURIComponent(element.name) + '.y=' + Math.floor(offsetY);
                    }
                }
                else if ((tagName === 'BUTTON') && (element.name.length !== 0) && (element.type === 'submit')) {
                    this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                }
            }
        };
    }
});