java code 39 barcode The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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The initListEditor() function takes one argument, the ID of the list to edit, and calls getElementById() to retrieve the node for that list The script stores that node in a global variable named gTheList It then adds an event handler for click events to the list IE and Netscape handle events slightly differently, so the script needs to detect which browser is running and call the appropriate API Because only IE 6 has a window property named event, the script tests for the existence of the windowevent property and calls the attachEvent() method if it is present If not, the script calls the DOM Level 2 Events method addEventListener() because that is what Netscape 6 uses This event handler, named itemClick(), will be the one that processes mouse clicks on all of the list items When the user clicks a list item, the itemClick() event handler method is called If the function is running under Netscape 6, the function will be called with a single argument, an Event data structure Under IE, the function is called with no arguments; the global property windowevent contains all of the event information The function retrieves the target of the mouse click and stores it in a local variable, oTarget The next line checks to see if the mouse clicked a text element, which would be the text child node of an <LI> tag If so, the getParentLITag() function is called to retrieve the corresponding <LI> tag of the text node Once the <LI> tag that was clicked has been determined, the script is ready to create the controls to handle the in-place editing However, if the controls are already editing another item, they must first be moved to the new item The script calls getElementById() with the itemText argument, which is the ID for the edit field If this returns a non-null value, the script calls getParentLITag() to retrieve the parent list item for the edit field and resets its innerHTML to the contents of the global variable gOldContent The first time the list is clicked, there will be no current list item being edited, so this code will not execute, and thus the gOldContent variable does not need to be initialized Instead, the next line of the script, which sets the content of the gOldContent variable to the text content of the <LI> tag, will be executed This variable is used to store away the original contents of the <LI> tag in case the user decides to cancel editing the item or clicks another item Finally, the script calls editListItem() with one argument, the LI node that is about to be edited The editListItem() function begins by retrieving the text content of its child Text node, which will be used to initialize the value of the edit field Next, the script uses the createElement() DOM method to create an <INPUT> element for the edit field The setAttribute() method is used to set the type, value, and id attributes for the edit control The script then calls the replaceChild() method on the <LI> node to replace the child Text node with the edit field
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9: Dynamic User Interfaces
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Once the edit control has been added, the script creates the Change, Cancel, and Delete buttons by calling the createElement() and setAttribute() methods Each button is assigned a click event handler by calling the addClickHandler() function, which is a simple utility function that takes a node and assigns a click event handler to it, depending on which browser the script is running under The Change button is assigned the commitChange() handler, the Cancel button is assigned the cancelEdit() handler, and the Delete button is assigned the deleteItem() handler Once each button has been created, it is added as a child of the LI node by calling appendChild() When the editListItem() function completes, the controls have all been created and placed in position Now, the script just needs to handle the button clicks for the item being edited The commitChange() event handler, which is called when the user clicks the Change button, retrieves the node for the edit control and extracts the value that the user has entered into the control The script then sets the innerHTML attribute of the <LI> tag to the text string This has two purposes: first, it stores the value that the user entered into the control as the new text for the <LI> tag Second, it has the side effect of deleting the controls because the document will be reflowed by the browser when the innerHTML property is set
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