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function referencing the local variable, an implicit execution context or scope is created to allow the reference to be maintained after the enclosing function exits. (See appendix B for more on closures.) This lets us implement handling of the Ajax response by calling a first-class method on our ajaxHelper object. Finally, we send the Ajax request. Note that the array we created in step 1 is passed to a method named queryString that converts it to a single string. That string becomes the body of the Ajax request. The queryString method isn t really part of the public contract we discussed earlier, but it s a helper method that keeps the code clean and readable. Let s take a look at it in listing 9.8.
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Listing 9.8 The queryString method
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queryString: function(args) { var requestParams = []; for ( var i = 0 ; i < this.requestParams.length ; i++ ) { requestParams.push(this.requestParams[i]); } for ( var j = 0 ; j < args.length ; j++ ) { Runtime requestParams.push(args[j]); parameters }
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Constant parameters
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var queryString = ""; if ( requestParams && requestParams.length > 0 ) { for ( var i = 0 ; i < requestParams.length ; i++ ) { queryString += requestParams[i] + '&'; } queryString = queryString.substring(0, queryString.length-1); } return queryString; },
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This method takes the request parameters that our net.ContentLoader was constructed with, along with the additional runtime parameters that were passed into the sendRequest method, and places them into a single array. It then iterates over the array and converts it into a querystring. An example of what this achieves is shown here:
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var helper = new net.ContentLoader( someObj, someUrl, "POST", ["a=one", "b=two"] ); var str = ajaxHelper.queryString( ["c=three", "d=four"] ); str => "a=one&b=two&c=three&d=four"
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The last thing we need to do to have a fully functional helper object is to collaborate with a component to handle the response that comes back from Ajax. If you ve been paying attention, you probably already know what this method will be named. Our sendRequest method already specified how it will handle the response from the onreadystatechange property of the request:
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request.onreadystatechange = function(){ oThis.handleAjaxResponse(request) }
That s right, kids; all we need to do is implement a method named handleAjaxResponse. Listing 9.9 contains the implementation.
Listing 9.9 The Ajax response handler methods
handleAjaxResponse: function(request) { if ( request.readyState == net.READY_STATE_COMPLETE ) { if ( this.isSuccess(request) ) Message component this.component.ajaxUpdate(request); with response else this.component.handleError(request); Message component } with error }, isSuccess: function(request){ return request.status == 0 || (request.status >= 200 && request.status < 300); }
All the method does is check for the appropriate readyState of 4 (indicating completion) and notifies the this.component that the response is available. But we re not quite finished yet. The other requirement we said we would address is to handle errors appropriately. But what is appropriate The point is, we don t know what s appropriate. How to handle the error is a decision that should be deferred to another entity. Therefore we assume that our client, this.component, has a handleError method that takes appropriate action when the Ajax response comes back in a way we didn t expect. The component may in turn delegate the decision to yet another entity, but that s beyond the scope of what we care about as a helper object. We ve provided the mechanism; we ll let another entity provide the semantics. As mentioned earlier, we re assuming that this.component has an ajaxUpdate and a handleError method. This is an implicit contract that we ve created, since JavaScript isn t a strongly typed language that can enforce such constraints.
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Congratulations! You ve morphed net.ContentLoader into a flexible helper to do all the Ajax heavy lifting for your Ajax-enabled DHTML components. And if you have a DHTML component that s not yet Ajax-enabled, now it ll be easier! Speaking of which, we have a double-combo component to write.
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