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<button id="btn1" onClick="showAlert" > </button>
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Dojo lets us assign event handlers programmatically using JavaScript
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1421 Using dojoconnect to Assign Event Handlers
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The dojoconnect method allows us to assign an event handler by naming the DOM element, the event, and the event handler and passing them as parameters to dojoconnectTable 141 describes this function in more detail
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Table 141
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dojoconnect Function for Standard Browser Events
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dojoconnect (domNode, event, handler) or dojoconnect (domNode, event, context, method) This function binds an event handler to an event on a DOM node Reference to the DOM node A string containing the description of the event These are the same as the standard event properties such as onclick, onblur, mouseover, and so on
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Method Signature: Summary: Parameter: domNode Parameter: event
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142 Defining and Assigning Event Handlers
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Table 141
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Continued
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This is a reference to the globally scoped function that is called when the event is triggered No parameters for the handler can be specified because Dojo provides the parameters itself when it makes the call to the handler This property can be either a string naming the function or a reference to the function When Dojo calls the handler, it passes the Dojo event object, which is described in Table 142
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Parameter: handler
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Parameter: context Parameter: method
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Reference to an object containing the handler function A function within the scope of the context object When context isn t specified, global becomes the default scope
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1422 Usage Example for Assigning Event Handlers
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Let s start with a simple example of how to assign an event handler to the onclick event for a DOM element First we must have a DOM elementThe following code creates a DOM element for a button:
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<button id="button1"> Click Me! </button>
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Next we create an event handler that writes a log message containing the type of the event:
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function handle(event) { consolelog("Running event handler for event type:", eventtype); }
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The event handler code has a few interesting features It takes an argument referencing the normalized event object created when the event is generatedThis is the Dojo event object, not the raw JavaScript event objectThe advantage of using the Dojo version is that it is the same regardless of the browser that is being used to run the page Another important feature of the event handler function is that it doesn t return anything Any data that it returns is ignored Next we assign the event handler to the onclick event for the button using the dojoconnect function:
dojoconnect(dijitbyId('button1'), "onclick", handler);
This code should only be executed after the DOM is fully loaded, Dojo has been
14
Events and Event Handling
installed, and the DOM has been parsed by DojoThis is easy to do by using the dojoaddOnLoad function and calling dojoconnect with an anonymous function containing the following code:
dojoaddOnLoad(function() { dojoconnect(dijitbyId('button1'), "onclick", handler); });
There are a couple of comments I d like to make concerning this code First, when assigning handlers to DOM events, always use dijitbyId, not dojobyIdThe reason for this is that the Dojo parser might add additional DOM elements to the base DOM element defined in the HTML It might be one of those child elements that the event is triggered on Don t try to figure this out; just let Dojo pick the right one by using dijitbyId The second point is that we have a choice when specifying the DOM event name We can use the on prefix or leave it off For example, click and onclick are equivalent events Choose whichever you prefer I like using onclick just so I can be consistent with the DOM element property names To add additional event handlers, just run additional dojoconnect functionsYou can attach an unlimited number of handlers to an event
dojoconnect(dijitbyId('button1'), "onclick", handler2);
To remove the event handlers, use dojodisconnect with the same parameters Each handler must be removed separately
143 Representing an Event as an Object
A developer doesn t write code to call the event handlers; the browser does that automatically when an event is generatedThat means you can t control the arguments passed to the event handler or whether any arguments are passed at allWhen an event handler is called in Firefox, an event object is passed as the parameterThis isn t true for Internet Explorer, which requires the event handler function to look up the event object Also, the event object itself is slightly different between the two major browsers The Dojo event system provides two major benefits over JavaScript First, it ensures that an event object is always passed to the handler, regardless of the browser And second, it provides a standard event object that is always the sameThis is sometimes referred to as a normalized event object Although event handlers receive only a single parameter, the event object, that object contains multiple properties and methodsThe primary purpose of the event object is to be a wrapper around the event itself, capturing information about the event such as the DOM element that triggered it and the coordinates of the cursor at the time the event