modalpopupbehavior.js

AJAX 应用 实现页面的无刷新

            while (tempRelativeOrAbsoluteParent && (tempRelativeOrAbsoluteParent != document.documentElement)) {
                if((tempRelativeOrAbsoluteParent.style.position != 'relative') && (tempRelativeOrAbsoluteParent.style.position != 'absolute')) {
                    tempRelativeOrAbsoluteParent = tempRelativeOrAbsoluteParent.parentNode;
                } else {
                    this._relativeOrAbsoluteParentElement = tempRelativeOrAbsoluteParent;
                    break;
                }
            }                       
        }        


        // Disable TAB
        this.disableTab();

        this._layout();
        // On pages that don't need scrollbars, Firefox and Safari act like
        // one or both are present the first time the layout code runs which
        // obviously leads to display issues - run the layout code a second
        // time to work around this problem
        this._layout();
        
        this.raiseShown(Sys.EventArgs.Empty);
    },

    disableTab : function() {
        /// <summary>
        /// Change the tab indices so we only tab through the modal popup
        /// (and hide SELECT tags in IE6)
        /// </summary>

        var i = 0;
        var tagElements;
        var tagElementsInPopUp = new Array();
        Array.clear(this._saveTabIndexes);

        //Save all popup's tag in tagElementsInPopUp
        for (var j = 0; j < this._tagWithTabIndex.length; j++) {
            tagElements = this._foregroundElement.getElementsByTagName(this._tagWithTabIndex[j]);
            for (var k = 0 ; k < tagElements.length; k++) {
                tagElementsInPopUp[i] = tagElements[k];
                i++;
            }
        }

        i = 0;
        for (var j = 0; j < this._tagWithTabIndex.length; j++) {
            tagElements = document.getElementsByTagName(this._tagWithTabIndex[j]);
            for (var k = 0 ; k < tagElements.length; k++) {
                if (Array.indexOf(tagElementsInPopUp, tagElements[k]) == -1)  {
                    this._saveTabIndexes[i] = {tag: tagElements[k], index: tagElements[k].tabIndex};
                    tagElements[k].tabIndex="-1";
                    i++;
                }
            }
        }

        //IE6 Bug with SELECT element always showing up on top
        i = 0;
        if ((Sys.Browser.agent === Sys.Browser.InternetExplorer) && (Sys.Browser.version < 7)) {
            //Save SELECT in PopUp
            var tagSelectInPopUp = new Array();
            for (var j = 0; j < this._tagWithTabIndex.length; j++) {
                tagElements = this._foregroundElement.getElementsByTagName('SELECT');
                for (var k = 0 ; k < tagElements.length; k++) {
                    tagSelectInPopUp[i] = tagElements[k];
                    i++;
                }
            }

            i = 0;
            Array.clear(this._saveDesableSelect);
            tagElements = document.getElementsByTagName('SELECT');
            for (var k = 0 ; k < tagElements.length; k++) {
                if (Array.indexOf(tagSelectInPopUp, tagElements[k]) == -1)  {
                    this._saveDesableSelect[i] = {tag: tagElements[k], visib: $common.getCurrentStyle(tagElements[k], 'visibility')} ;
                    tagElements[k].style.visibility = 'hidden';
                    i++;
                }
            }
        }
    },

    restoreTab : function() {
        /// <summary>
        /// Restore the tab indices so we tab through the page like normal
        /// (and restore SELECT tags in IE6)
        /// </summary>

        for (var i = 0; i < this._saveTabIndexes.length; i++) {
            this._saveTabIndexes[i].tag.tabIndex = this._saveTabIndexes[i].index;
        }
        Array.clear(this._saveTabIndexes);

        //IE6 Bug with SELECT element always showing up on top
        if ((Sys.Browser.agent === Sys.Browser.InternetExplorer) && (Sys.Browser.version < 7)) {
            for (var k = 0 ; k < this._saveDesableSelect.length; k++) {
                this._saveDesableSelect[k].tag.style.visibility = this._saveDesableSelect[k].visib;
            }
            Array.clear(this._saveDesableSelect);
        }
    },

    hide : function() {
        /// <summary>
        /// Hide the modal dialog
        /// </summary>
        /// <returns type="Boolean" mayBeNull="false">
        /// Whether or not the dialog was hidden
        /// </returns>

        var eventArgs = new Sys.CancelEventArgs();
        this.raiseHiding(eventArgs);
        if (eventArgs.get_cancel()) {
            return false;
        }

        this._hideImplementation();

        this.raiseHidden(Sys.EventArgs.Empty);
        return true;
    },

    _hideImplementation : function() {
        /// <summary>
        /// Internal implementation to hide the modal dialog
        /// </summary>

        this._backgroundElement.style.display = 'none';
        this._foregroundElement.style.display = 'none';

        this.restoreTab();

        this._detachPopup();
    },

    _layout : function() {
        /// <summary>
        /// Position the modal dialog 
        /// </summary>
        var scrollLeft = (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft);
        var scrollTop = (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);
               
        var clientBounds = $common.getClientBounds();
        var clientWidth = clientBounds.width;
        var clientHeight = clientBounds.height;
        
        // Setup the location of the background element
        this._layoutBackgroundElement();

        var xCoord = 0;
        var yCoord = 0;
        if(this._xCoordinate < 0) {
            var foregroundelementwidth = this._foregroundElement.offsetWidth? this._foregroundElement.offsetWidth: this._foregroundElement.scrollWidth;
            xCoord = ((clientWidth-foregroundelementwidth)/2);
            // workaround for drag behavior which calls setlocation which in turn
            // changes the position of the panel to be absolute and requiring us
            // to add the scrollLeft so that it is positioned correctly.
            if (this._foregroundElement.style.position == 'absolute') {
                xCoord += scrollLeft;
            }
            this._foregroundElement.style.left = xCoord + 'px';
            
        } else {
            if(this._isIE6) {
                this._foregroundElement.style.left = (this._xCoordinate + scrollLeft) + 'px';
                xCoord = this._xCoordinate + scrollLeft;
            }
            else {
                this._foregroundElement.style.left = this._xCoordinate + 'px';
                xCoord = this._xCoordinate;
            }
        }
        if(this._yCoordinate < 0) {
            var foregroundelementheight = this._foregroundElement.offsetHeight? this._foregroundElement.offsetHeight: this._foregroundElement.scrollHeight;
            yCoord = ((clientHeight-foregroundelementheight)/2);           
            // workaround for drag behavior which calls setlocation which in turn
            // changes the position of the panel to be absolute and requiring us
            // to add the scrollLeft so that it is positioned correctly.
            if (this._foregroundElement.style.position == 'absolute') {
                yCoord += scrollTop;
            }
            this._foregroundElement.style.top = yCoord + 'px';
          
        } else {
            if(this._isIE6) {
                this._foregroundElement.style.top = (this._yCoordinate + scrollTop) + 'px';
                yCoord = this._yCoordinate + scrollTop;
            }
            else {
                this._foregroundElement.style.top = this._yCoordinate + 'px';
                yCoord = this._yCoordinate;
            }
        }

        // make sure get location agrees with the location of the foreground element
        this._layoutForegroundElement(xCoord, yCoord);
        
        if (this._dropShadowBehavior) {
            this._dropShadowBehavior.setShadow();
            window.setTimeout(Function.createDelegate(this, this._fixupDropShadowBehavior), 0);
        }
        
        // layout background element again to make sure it covers the whole background 
        // in case things moved around when laying out the foreground element
        this._layoutBackgroundElement();
    },
    
    _layoutForegroundElement : function(xCoord, yCoord) {
        /// <summary>
        /// Set the correct location of the foreground element to ensure that it is absolutely 
        /// positioned with respect to the browser. This is just a workaround for IE 6 since
        /// elements nested in relative parents cause modal popup positioning issues and 'fixed'
        /// is not supported by IE 6. Hence we manually compute the right location of the popup.
        /// </summary>
        /// <param name="xCoord" type="Number" integer="true" maybenull="false">
        /// <param name="yCoord" type="Number" integer="true" maybenull="false">        
        /// </params>
        
        if (this._isIE6 && this._relativeOrAbsoluteParentElement) {
            var foregroundLocation = $common.getLocation(this._foregroundElement);  
            var relativeParentLocation = $common.getLocation(this._relativeOrAbsoluteParentElement);
            var getLocationXCoord = foregroundLocation.x;
            if (getLocationXCoord != xCoord) {
                // offset it by that amount
                this._foregroundElement.style.left = (xCoord - relativeParentLocation.x) + 'px';
            } 
                        
            var getLocationYCoord = foregroundLocation.y;
            if (getLocationYCoord != yCoord) {
                // offset it by that amount
                this._foregroundElement.style.top = (yCoord - relativeParentLocation.y) + 'px';
            } 
        }
    },
    
    _layoutBackgroundElement : function() {
        /// <summary>
        /// Set the correct location of the background element to ensure that it is absolutely 
        /// positioned with respect to the browser.
        /// </summary>

        // Background element needs to cover the visible client area completely hence its
        // top and left coordinates need to be 0, and if relatively positioned its getlocation
        // value needs to be 0.
        if(this._isIE6) { 
            var backgroundLocation = $common.getLocation(this._backgroundElement);
            var backgroundXCoord = backgroundLocation.x;
            if (backgroundXCoord != 0) {
                // offset it by that amount. This is assuming only one level of nesting. If
                // multiple parents with absolute/relative positioning are setup this may not 
                // cover the whole background.
                this._backgroundElement.style.left = (-backgroundXCoord) + 'px';
            } 
            
            var backgroundYCoord = backgroundLocation.y;
            if (backgroundYCoord != 0) {
                // offset it by that amount. This is assuming only one level of nesting. If
                // multiple parents with absolute/relative positioning are setup this may not 
                // cover the whole background.
                this._backgroundElement.style.top = (-backgroundYCoord) + 'px';
            }         
        }
        var clientBounds = $common.getClientBounds();
        var clientWidth = clientBounds.width;
        var clientHeight = clientBounds.height;
        this._backgroundElement.style.width = Math.max(Math.max(document.documentElement.scrollWidth, document.body.scrollWidth), clientWidth)+'px';
        this._backgroundElement.style.height = Math.max(Math.max(document.documentElement.scrollHeight, document.body.scrollHeight), clientHeight)+'px';
    },

    _fixupDropShadowBehavior : function() {
        /// <summary>
        /// Some browsers don't update the location values immediately, so
        /// the location of the drop shadow would always be a step behind
        /// without this method
        /// </summary>

        if (this._dropShadowBehavior) {
            this._dropShadowBehavior.setShadow();
        }
    },

    _partialUpdateEndRequest : function(sender, endRequestEventArgs) {
        /// <summary>
        /// Show the popup if requested during a partial postback
        /// </summary>
        /// <param name="sender" type="Object">
        /// Sender
        /// </param>
        /// <param name="endRequestEventArgs" type="Sys.WebForms.EndRequestEventArgs">
        /// Event arguments
        /// </param>
        /// <returns />
        AjaxControlToolkit.ModalPopupBehavior.callBaseMethod(this, '_partialUpdateEndRequest', [sender, endRequestEventArgs]);

        if (this.get_element()) {
            // Look up result by element's ID
            var action = endRequestEventArgs.get_dataItems()[this.get_element().id];
            if ("show" == action) {
                this.show();
            } else if ("hide" == action) {
                this.hide();
            }
        }

        // Async postback may have added content; re-layout to accomodate it
        this._layout();
    },

    _onPopulated : function(sender, eventArgs) {
        /// <summary>
        /// Re-layout the popup after we've dynamically populated
        /// </summary>
        /// <param name="sender" type="Object">
        /// Sender
        /// </param>
        /// <param name="eventArgs" type="Sys.EventArgs">
        /// Event arguments
        /// </param>
        /// <returns />
        AjaxControlToolkit.ModalPopupBehavior.callBaseMethod(this, '_onPopulated', [sender, eventArgs]);

        // Dynamic populate may have added content; re-layout to accomodate it
        this._layout();