itextsharp barcode vb net The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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displayed Finally, the menu s location is offset by a few pixels to ensure that it is placed under the mouse pointer:
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if (typeof(windowevent)!= "undefined") { menuX = windoweventclientX + documentdocumentElementscrollLeft + documentbodyscrollLeft; menuY = windoweventclientY + documentdocumentElementscrollTop + documentbodyscrollTop; } else { menuX = eventclientX + windowscrollX; menuY = eventclientY + windowscrollY; } // start the menu underneath the mouse a little bit menuX -= gMenuOffsetX; menuY -= gMenuOffsetY;
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Once the position for the menu has been calculated, the menu is moved to its location by setting the top and left properties of the DIV s style:
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theNodestyletop = menuY + "px"; theNodestyleleft = menuX + "px";
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Next, the menu is made visible by setting the visibility property of the style:
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theNodestylevisibility = "visible";
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Finally, the script sets an onMouseOut handler for the DIV so that it will be notified when the mouse leaves the menu This is done so the menu can be hidden:
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theNodestylevisibility = "visible";
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At this point, the menu is visible on the screen, and the user can interact with it using the mouse As each item is moved over by the mouse, it highlights and unhighlights When the mouse is moved off the DIV, the doMouseOut() method is called, which hides the menu First, the menu determines the current target of the event and the new target where the mouse is moving to:
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if (typeof(windowevent) != "undefined") { curNode = this;
9: Dynamic User Interfaces
newNode = windoweventtoElement; } else { curNode = evtcurrentTarget; newNode = evtrelatedTarget; }
Next, things get a little tricky Because the mouseout event will be generated for the DIV s child <A> tags, it is necessary to make sure that the new element that the mouse is moving to is not the DIV itself or one of the <A> tags that constitute the menu items Otherwise, the menu would disappear as soon as you moved the mouse, even if you kept it within the confines of the DIV tag! The solution is to make sure that new target and current targets are different and that the new target is not one of the child elements of the DIV element If these conditions are met, the menu is hidden again by setting the visibility property of the style to hidden:
if (curNode != newNode && !containsNode(curNode, newNode)) curNodestylevisibility = "hidden";
The containsNode() method is a utility function that determines whether a node contains another node Internet Explorer provides a native implementation of this function, but unfortunately Netscape does not, so the script uses its own version Given the test node and the node that might be the container, the code successively examines each parent of the test node to see if it is the container node:
while (testNodeparentNode) { testNode = testNodeparentNode; if (testNode == containerNode) return true; } return false;
If the container node is found as one of the ancestors of the test node, the function returns true Otherwise, the top of the document is eventually reached, and the function returns false
The Document Object Model: Processing Structured Documents
Conclusion
In this chapter, you saw how to accomplish some common user interface techniques using the DOM that used to require browser-specific DHTML programming (and in some cases, couldn t even be accomplished with DHTML) First, you saw how to create a web page-based color picker that allows users to select colors from a palette of web-safe color values This example used mouse-move and click events to update the color selection fields Next, you examined a new way to provide list editing functionality that allows a user to edit items in a list directly in-place by dynamically creating form controls when the user clicks a list item Finally, you took a crack at a DOM-oriented solution to a familiar problem: cross-browser pop-up menus, written entirely using the DOM and CSS In the next chapter, we ll focus on how to use the DOM to perform client-side data-driven document processing These techniques can make web pages even more powerful and useful to users because the information contained within them can be processed and manipulated without having to wait for round trips to the server each time This results in saved bandwidth, improved responsiveness, and a lighter processing load on the server
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