/*
Last Modified: 11122009, Bryian Tan
*   Fix bug mentioned by CodeProject user, prodriguez13. The JavaScript will throw
    an error when the control to validate is not visible. To remedy this, onload event, I have added DisableValidators function.
    This function is responsible to disable all the validators with controltovalidate === null.
*   I received a few requests on getting this script to work with Image button. I managed to put together a solution
    for it. Let me know if you find any bugs.
*   Tested on IE 7.0/8.0, FireFox, image would not show on Google Chrome, maybe someone can shed some light on this.

*/

function ResetToDefault(btn, oldValue) {
    btn.disabled = false;
    btn.value = oldValue;
}
//browser properties
var Browser = {
    Version: function() {
        var version = 999;
        if (navigator.appVersion.indexOf("MSIE") != -1) {
            version = parseFloat(navigator.appVersion.split("MSIE")[1]); return version;
        }
    },
    Name: navigator.appName,
    isIE: function() {
        if (navigator.appVersion.indexOf("MSIE") != -1) {
            return true;
        }
        return false;
    }
};

//Handle Page_Validators is not defined error
//http://www.velocityreviews.com/forums/t88987-pagevalidators-error.html
function HasPageValidators() {
    var hasValidators = false;
    try {
        if (Page_Validators.length > 0) {
            hasValidators = true;
        }
    }
    catch (error) { }

    return hasValidators;
}


function SetImage(btn) {

    if (btn.type == "image") {
        btn.src = null;
        btn.style.width = '100px';
        btn.style.height = '20px';
        btn.style.backgroundImage = 'url(http://images.ysatech.com/ajax-loader.gif)';
    }
    else {
        //somehow backgroundImage not working with IE 7
        if (Browser.isIE() && Browser.Version() === 7) {
            btn.style.background = 'url(http://images.ysatech.com/ajax-loader.gif)';
        }
        else {
            btn.style.backgroundImage = 'url(http://images.ysatech.com/ajax-loader.gif)';
        }
    }
}

//enable the button and restore the original text value for browsers other than IE
function EnableOnUnload(btn, btnText) {
    if (!Browser.isIE()) {
        window.onunload = function() {
            ResetToDefault(btn, btnText);
        };
    }
}

//check if the validator have any control to validate
function EnableValidator(validator) {
    var controlToValidate = document.getElementById(validator.controltovalidate);

    if (controlToValidate !== null) {
        // alert(controlToValidate.id);
        ValidatorEnable(validator);
        return true;
    }
    ValidatorEnable(validator, false);

    return false;
}

function disableBtn(btnID, newText) {
    var btn = document.getElementById(btnID);
    var oldValue = btn.value;
    btn.disabled = true;
    btn.value = newText;
    
    //if validator control present
    if (HasPageValidators()) {

        Page_IsValid = null;

        //http://sandblogaspnet.blogspot.com/2009/04/calling-validator-controls-from.html
        //double check, if validator not null
        if (Page_Validators !== 'undefined' && Page_Validators !== null) {
            //Looping through the whole validation collection.
            for (var i = 0; i < Page_Validators.length; i++) {

                var validator = Page_Validators[i];

                //check if control to validate is enable 
                if (EnableValidator(validator)) {

                    if (!Page_Validators[i].isvalid) { //if not valid
                        ResetToDefault(btn, oldValue); //break;
                    }
                }
            }

            //   else { //if valid
            var isValidationOk = Page_IsValid;

           // alert('isValidationOk ' + isValidationOk);

            EnableOnUnload(btn, btn.value);
            if (isValidationOk !== null) {
                if (isValidationOk) {
                    SetImage(btn);
                    __doPostBack(btnID, '');
                    // break;
                }
                else { //page not valid
                    btn.disabled = false;
                }
            }
            //  }
            
        }
    }
    else { //regular, no validation control present
        // setTimeout("SetImage('" + btn + "')", 5);
        SetImage(btn);
        btn.disabled = true; btn.value = newText;
        EnableOnUnload(btn, btn.value);
    }
}

//disable those validators where controltovalidate = null
function DisableValidators() {
    //this will get rid of the Page_Validators is undefined error
    if (typeof (Page_Validators) === 'undefined')
        return;
        
    if (Page_Validators !== 'undefined' && Page_Validators !== null) {
        for (var i = 0; i < Page_Validators.length; i++) {
            var validator2 = Page_Validators[i];
            var controlToValidate2 = document.getElementById(validator2.controltovalidate);
            if (controlToValidate2 === null) {
                ValidatorEnable(validator2, false);
            }
        }
    }
    return false;
}

window.onload = DisableValidators;