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HTML events can be associated with any HTML element. The HTML event can be triggered in two ways: the HTML element triggers the event, or the HTML element contains another element that triggers the event. HTML has a unique characteristic in that events can pass up a hierarchy of elements in a process called event bubbling. In event bubbling, an HTML element triggers an event that is sent from one HTML element to another HTML element. The idea is to pass the HTML event from the child to the parent, and to continue that event-chaining process until the last parent is called. Typically, the last parent to process a bubbling HTML event is the HTML document. Consider the following HTML, which illustrates event bubbling:
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1. At the time of this writing, there exists a hack that makes it possible to load a script that violates the same origin policy. The technique is considered a hack because it is a loophole that most likely will be closed at some later point and is a security issue.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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<body> <h1>Decoupled Navigation Pattern: Action Examples</h1> <div id="div" onclick="OnClick( event)" style="background:yellow;"> <p id="paragraph">Hello</p> <table border="1"> <tr id="Row 1"> <td id="Row 1 Cell 1">OnClick</td> </tr> <tr id="Row 2"> <td id="Row 2 Cell 1"> <input type="button" value="Button" id="Row 2 Button 1"/> </td> </tr> <tr> <td id="eventDestination">Nothing yet</td> </tr> </table> </div> </body> The example HTML content has a header (h1), block division (div), paragraph (p), table (table), table row (tr), and table cell (td). Each element is embedded in another element. Put simply, there is a block division element embedding a table, which is embedding a table row, EBVN and so on. Graphically, the structure would be similar to Figure 6-9.
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Figure 6-9. HTML page structure
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Even though this discussion of the HTML structure might seem basic and long-winded, it is important to realize that there is a nested structure because HTML event bubbling and how it occurs is directly related to this structure. Looking back at the HTML code, you can see that the div HTML element has the onclick attribute, which implements the onclick event. From a traditional programming perspective, the defined onclick event would capture only click events that relate directly to the div element. With event bubbling, the defined event will be triggered for all click events that involve the div element and one of its descendent elements. This means that if the nested button is clicked, the OnClick function is called. Event bubbling is a clever way to define collecting-type events that can be triggered by multiple HTML elements. However, event bubbling works only if the event bubbles. There are some HTML events that will not bubble and are specific to the HTML element. Let s say that an event has been triggered and is bubbling up the chain. If the event is caught and processed, the caught event can be canceled. The way to cancel the event is to return false, as illustrated by the following example: <div onclick="return false" /> Canceling an event that is bubbling works only if the event can be canceled. Canceling every onclick event is a solution when you don t want the browser to process certain events to disable functionality. In the example HTML, the event called the OnClick function will process the click event for multiple HTML elements. The implementation of the function is as follows:
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E B V N function OnClick( evt) {
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evt = (evt) evt : ((event) event : null); if( evt) { var elem = (evt.target) evt.target : ((evt.srcElement) evt.srcElement : null); if( elem) { document.getElementById( "eventDestination").innerHTML = "Click (" + elem.id + ")"; } }
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} When an HTML event is triggered, the details of the event are not cross-browser compatible. To make the event cross-browser compatible, several extra steps need to be carried out. The function OnClick has a single parameter, evt, which is supposed to represent the event. But the function signature for an event, which has a single parameter, is not recognized in all browsers. The following source code is used to extract the event object instance regardless of browser used: evt = (evt) evt : ((event) event : null);
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