Internet Explorer calling [removed] on window.open and AJAX calls

Question

Ok, I have spent a while on this problem and this is what I have gathered:

1. If you make an AJAX call in IE7 and you have a window.onbeforeunload function spe

Answer 1

I had the same problem, in my case all request come from ajax call, this simplify the solution, because when I fixed the porblem with standard button I did a recursive function to redirect all onclick to my centralized function an then dispath the rigth click. I am copying the solution for ajax call suporting href problem too. This solution avoid to return to previous page. Put the code inside a file named backbutton,js Any comment write to mparma@usa.net with subject: javascript backbutton

var returningAddress = "http://my returning address"


var backButtonMessage = "Using the browser's Back button may cause a loss in data. Please use the Back and Continue buttons at the bottom of the form."



var backButtonPressed = 1;    


var onbeforeunloadeventFired = 0;


var backtoLogin = 0;
var DoPostBackWithOptionsHook = null;
var DoPostBackHook = null;



if (window.name == ""){
    
    window.name = "L0001";
}
else { 
    if (window.name == "L0000_back"){
        
        setBackButton(0);
        window.name = "";

        
        window.location.href = returningAddress;
    }
    else {
        if (window.name.indexOf("_back") > 4){
            

            
            var sLastValue = modifynamevalue(0);    

            
            var iCountBack = -(sLastValue * 1);
            if (backtoLogin == 1) {iCountBack++;};

            if (window.history.length - 2 < -iCountBack) {
                iCountBack = -(window.history.length - 2);
            }

            
            window.name = "L0000_back";             
            setBackButton(0);

            
            window.history.go(iCountBack);
        }
        else {
            
            var sLastValue = modifynamevalue(+1);
            window.name = "L" + sLastValue;
        }
    }
}



$(document).ready(function(){
    if (typeof(Sys) == "object") {
        Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequest);
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);

        window.onbeforeunload = onbeforeunloadEvent;
        window.onunload = unloadEvent;
        DoPostBackWithOptionsHook = WebForm_DoPostBackWithOptions;
        WebForm_DoPostBackWithOptions = WebForm_DoPostBackWithOptionsHook;

        doPostBackHook = __doPostBack;
        __doPostBack =  __doPostBackHook;

    }

    });

function WebForm_DoPostBackWithOptionsHook(options) {
    setBackButton(0);
    return DoPostBackWithOptionsHook(options)
}

function __doPostBackHook(eventTarget, eventArgument) {
    if (backButtonPressed == 1) {
        setBackButton(0);
    }
    return doPostBackHook(eventTarget, eventArgument)
} 

function beginRequest(sender, args) {
    setBackButton(0);
    
    onbeforeunloadeventFired = 1;
}


function endRequest(sender, args) {
    onbeforeunloadeventFired = 0;
    setBackButton(1);
}


function unloadEvent(evt) {
    
    if ((backButtonPressed == 1) && (onbeforeunloadeventFired == 1)) {
        
        var sLastValue = modifynamevalue(-1);
        window.name = "L" + sLastValue + "_back";
    }

    if (DoPostBackWithOptionsHook !== null) {
        WebForm_DoPostBackWithOptions = DoPostBackWithOptionsHook;
    };

    if (doPostBackHook !== null) {
        __doPostBack = doPostBackHook;
    };
}


function onbeforeunloadEvent(evt) {
    onbeforeunloadeventFired = 1;
    if (backButtonPressed == 1) {
        return backButtonMessage;
    };
}



function setBackButton(value){
    if (value == 0) {
        backButtonPressed = 0;
    }
    else {
        if (onbeforeunloadeventFired == 0) {
            backButtonPressed = 1;
        }
    }
}



function modifynamevalue(iIncrement){
    var iCount = (window.name.substring(1, 5) * 1) + iIncrement;

    if (iCount < 0) {
        iCount = 0;
    }

    var sNewValue = iCount.toString();

    sNewValue = "0000".substring(0, 4 - sNewValue.length) + sNewValue;
    return sNewValue;
}