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When the cursor is placed over the paragraph text, it is also over the <div> element, its parent As the cursor is moved over the paragraph text, events for both the paragraph and the <div> are generated And you can cause the page to respond to either or both To complicate things further, we should recognize that there is a wide variety of possible user interactions that the browser can detect in addition to the ones we ve already discussedThese include the following events: Pressing the mouse button Releasing the mouse button Pressing a key Releasing a key Moving the mouse wheel
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141 Description of the Event Model
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And this is still only a subset of the possible events How many different events might a web page have Let s do a quick and dirty calculation Imagine a page with 200 DOM events (not a large page by any means)There are at least 50 types of user interactions possible with each DOM element So there are more than 10,000 possible events that could be identified by the browser that we could write event handlers for And that doesn t include the Browser events Aside from DOM events, what other events can be identified One of the most well known is the onLoad event, which is triggered when the browser has finished building the web page from the HTML file received from the serverThis event is generated internally in the browser and is not based on any user input at all Another type of event, windowonresize, is created when the user changes the size of the browser window itself Although it is based on user activity, it isn t associated with any specific DOM element The task of responding to events might now seem immense But there is some good news Even though the universe of possible events on a typical web page might be quite large, the number of events that we need to respond to is usually rather small
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1412 Additional Dojo Events
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Dojo can recognize all the events already described, but it also adds a few events of its ownThe most interesting of these is an event that occurs when a JavaScript function is executedThis allows developers to use a new programming model called Aspect Oriented Programming (AOP) more on this later in the chapter Dojo also provides enhancement to some of the standard Browser events such as onload In standard JavaScript, the onload event is triggered when the browser has completed the loading of the web page But often, you don t want your code to run until the page is loaded and Dojo has done all of its setup work, including loading of the various Dojo packages and the execution of the Dojo page parser If you simply attach an event handler to onload, your handler may run before Dojo setup is complete Dojo provides a special function for assigning event handlers so that they don t get executed until Dojo setup is completeThis is the dojoaddOnLoad function The following example shows two techniques for using dojoaddOnLoadThe first line of code shows how to attach an existing function called eventHandler as an event handler for the Dojo onload eventThe subsequent code shows how to attach a line of code inside an anonymous function, which is then associated with the Dojo onLoad event
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dojoaddOnLoad(eventHandler); dojoaddOnLoad(function() { consolelog("Dojo setup complete"); });
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Now that we understand the events that can occur in a web page, we need to explore how to respond to them
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If a tree falls in the forest, does it make a sound Or more apropos: If an event triggers no action, is it really an event Philosophy aside, identifying events is only important because we want to associate some action with themThese actions are known as event handlersThey re the JavaScript functions that execute in response to events Let s explore a simple exampleThe following function displays a message on the screen:
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function showAlert() { alert("Hello World"); }
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Is this code an event handler Maybe, but only if it is used to handle an event Although that sounds like circular logic, let me explain what I mean An event handler can be any function, and the example code certainly is a functionWhat makes a function into an event handler is that we tell the browser to call that function when it detects a certain event Let s see how we do that Imagine that we would like the showAlert function to run whenever a button on the web page is clickedWe need to create the DOM element for the button and then assign an event handler to the event that is generated when the user clicks the button The following code shows one technique for creating the element and assigning the event handler:
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