java qr code generator maven Attaching and removing timing events in Java

Creating QR-Code in Java Attaching and removing timing events

Listing 10.19 Attaching and removing timing events
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function EraseTimeout(){ clearTimeout(isTiming); isTiming = false; } function StartTimeout(){
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The client-side framework
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isTiming = setTimeout("HideTheBox()", theTextBox.obj.theVisibleTime); }
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The function StartTimeout() sets the timer when the function is executed. We initialize the timer by setting the variable isTiming to the setTimeout method. The setTimeout method should call the function HideTheBox() after the set time span, indicated by theVisibleTime. The only other thing we have to do is to remove the timeout. To cancel it, we create the EraseTimeout() function that uses JavaScript s built-in clearTimeout() function for preventing HideTheBox() from firing. We set our boolean isTiming to false. Upon finishing that last line of code, we can now run the type-ahead suggest project! Save the project, open it, and start typing in a word. Figure 10.5 shows the progression of the type-ahead suggest. The first letter, s, returned more than 15 options. The second letter, h, reduced the list to five options. The third letter, o, reduced the list to one, which we selected by pressing the Enter key. By adding this project to any form, you can increase the efficiency of your users so they do not have to type in entire words.
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The progression of the type-ahead project
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Type-ahead suggest
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10.4 Adding functionality: multiple elements with different queries
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With the way that we designed the script, we can have multiple type-ahead select elements on the page. We just need to add declarations with new calls to SetProperties() for each element. The downside to this method is that in order to have different values fill in the drop-down, we would have to reference different server-side pages. In most cases we will be fine with this, but the only difference between these methods is most likely the SQL statement. We can come up with an elaborate solution to this problem by adding an additional parameter to our custom object and sending it to the server. Another option is to work with what we have now so that we can make a minimum number of changes to our code. In this case, the simple solution involves changing one line in our code and adding an if statement on the server-side code. The goal is to be able to somehow differentiate between the elements on the server to determine which element has caused the postback. A simple way to tell the difference is to use the name that is on the element. In this case, we ll reference the name of our textbox. In listing 10.20, we alter the parameter string to allow for this new functionality.
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Listing 10.20 Altering the TypeAhead() function to allow for different queries
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function TypeAhead(xStrText){ var strParams = "q=" + xStrText + "&where=" + theTextBox.obj.matchAnywhere + "&name=" + theTextBox.name; var loader1 = new net.ContentLoader(theTextBox.obj.serverCode, BuildChoices,null,"POST",strParams); }
By making the slight change to the variable strParams in the function TypeAhead(), we are passing the name of the textbox in the form parameters being passed to the server. That means we can reference this value on the server and use either an if-else or a case statement to run a different query. Now we do not need multiple pages for multiple elements.
10.5 Refactoring
Now that we ve developed a fairly robust set of features for providing typeahead suggest capabilities, it s time to think about how to package all of this functionality in a more palatable way for the consuming web developer. What
Refactoring
we ve developed to this point provides the functionality needed for the suggest behavior, but it has some drawbacks in terms of the work required for a developer to plug it into a web page or 20 to 30 web pages, for that matter. So let s imagine for a moment that we are the grand architect of an Ajax-based web framework and we ve been assigned the task of writing a suggest component for the rest of the company to use. As the requirements-gathering meeting disperses, we re handed a sheet giving us our loose set of functional requirements. Unsure of what we re getting into, we glance down at the list (table 10.2).
Table 10.2 Number 1 Our functional requirements Requirement Description The component must work with existing HTML markup without requiring any changes to the markup. Simple changes to the head section to inject the component s behavior are acceptable. The component must support being instantiated multiple times on the same page with no additional effort. Each component instance should be independently configurable, in terms of both the behavioral aspects (e.g., case matching, match anywhere) and the CSS styling. The component should not introduce any global variables. The company uses thirdparty JavaScript libraries, and the global namespace is already cluttered. Any global names, with the exception of the component itself, are strictly prohibited. The component should provide reasonable defaults for all of the configuration options. The component must work in IE and Firefox. The component should use an open source framework to reduce the amount of coding effort required and improve the quality and robustness of the solution. Oh, and if you can, get it done by the end of the week. Priority 1
As we survey the list, several thoughts run through our head. Okay, first of all, the powers that be don t seem understand the concept of a priority. But we re fairly used to that, so we look to the heart of the matter the requirements. And despite all our hard work, we ve satisfied less than half of them. Our script is already done, so that satisfies number 7 in the sense that we don t need to reduce the effort because the script is already implemented. Obviously requirement 8 is satisfied for the same reason. Our script supports multiple browsers, so number 6 is
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