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If no special key was pressed, then we check to see if we should hit the server to obtain the values or use the list that we already obtained from the server f. Here again we are using the caching mechanism of this script to limit the postbacks and reduce the load on the server. We can perform a couple of checks to see if we have to get new results. The first check is to determine whether or not the last active textbox is the textbox that currently has the focus. The next check is to make sure that the text the user typed into the textbox is the same as last time with only an addition at the end. If there are no results or our result set has 15 elements or less, then we need to check the server for data. The last check is to make sure that the current value s length is greater than the last value. If any of these checks pass, then we need to obtain new data from the server. We set the objLastActive with the current textbox. We then set a boolean saying that a request has been sent so we do not perform multiple requests, and we call our function TypeAhead() to grab the values. Then we set the current string in the textbox to the last-known string g. We ll use that value again to see if we need to request data from the server on the next keystroke. This brings us to accessing the server to obtain the data.
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10.3.3 Accessing the server
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The XMLHttpRequest object allows us to transfer the text from the textbox to the server and to receive the results from the server. In this case, we are posting the data to the server since the server-side page we created in listing 10.1 is referencing the elements submitted in a form. We must specify in our ContentLoader the location of the page on the server, the function to call when it is completed, and the form parameters to be submitted to the form, as shown in listing 10.11.
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Listing 10.11 Ajax functionality to send data back to the server
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function TypeAhead(xStrText){ var strParams = "q=" + xStrText + "&where=" + theTextBox.obj.matchAnywhere; var loader1 = new net.ContentLoader( theTextBox.obj.serverCode, BuildChoices,null,"POST",strParams); }
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When we called the function TypeAhead() from the function GiveOptions(), we passed the current string value from the textbox to perform the search. We need to build the parameter string, strParams, that contains our textbox string value
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and also the matchAnywhere boolean value. Both of these were used in listing 10.1 to develop the results. Then we start to load the document by calling the ContentLoader. We are sending the URL of the server-side page and the JavaScript function to call when the results are returned as the first two parameters in the ContentLoader. The third parameter is null since we want to ignore any error messages. Ignoring the errors allows the type-ahead to act like a normal text field. The last two properties inform the ContentLoader to post the data to the server and send the form parameters contained in the string strParams. When the results are returned from the server, the function BuildChoices() is called to allow us to finish the processing of the data on the client. When we developed the server-side code, we returned the results as a two-dimensional JavaScript array. This array contained the option s text-value pairs for the choices. However, in the response, it is just a string of characters. We need to take this returned string and make it accessible as a JavaScript array. Listing 10.12 contains the functionality that executes the information returned from our ContentLoader using the eval() method.
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