java data matrix generator Using JavaScript in Java

Generator DataMatrix in Java Using JavaScript

Using JavaScript
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You can also implement this functionality in JavaScript by using the client-side control libraries in Atlas. You do this by creating Atlas controls that reference the underlying HTML controls, as well as using some new controls that you haven t seen before those that represent the bindings themselves. The best way to understand this is to examine the script itself in detail. First you need to create the controls that represent the checkboxes and the text box: var textBox = new Sys.UI.TextBox($('textBox')); var checkBoxBoolean = new Sys.UI.CheckBox($('checkBoxBoolean')); var checkBoxDisabled = new Sys.UI.CheckBox($('checkBoxDisabled')); Next you create the binding. This is a control in the Web namespace. You create it using the following code: var binding_1 = new Web.Binding(); Next you need to set up the properties for the binding, setting up the dataContext, dataPath, local property, transformer argument, direction, and transform type:
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CHAPTER 5 s USING CLIENT CONTROLS IN ATLAS
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binding_1.set_dataContext(checkBoxBoolean); binding_1.set_dataPath('checked'); binding_1.set_property('text'); binding_1.set_transformerArgument("Checkbox is {0}."); binding_1.set_direction(Web.BindingDirection.InOut); binding_1.transform.add(Web.Binding.Transformers.ToString); This is the same as how you set it up in the Atlas Script earlier, pointing the binding at the checkBoxBoolean control s checked property. This is then bound to the text property of this control. Note that the binding hasn t yet been associated with the text box, but this will happen shortly. The transformer argument is set up to create the text that will show in the text box after the binding occurs, as well as the direction type for the binding. The values for the binding direction are available in the Web.BindingDirection enumeration. Additionally, the transform Web.Binding.Transformers.ToString is applied. Other values for the transform are available in the Web.Binding.Transformers enumeration. To associate this binding with the text box, you need to call the get_bindings() method to get the collection of bindings associated with this control and call its add method, passing it this binding. You do that like this: textBox.get_bindings().add(binding_1); Another binding connects the checkboxes to each other. Again, this is a Web.Binding control, which supports methods that allow you to set the data context, data path, transform, and property to which to bind. You set it up like this: var binding_2 = new Web.Binding(); binding_2.set_dataContext(checkBoxBoolean); binding_2.set_dataPath('checked'); binding_2.set_property('checked'); binding_2.transform.add(Web.Binding.Transformers.Invert); checkBoxDisabled.get_bindings().add(binding_2); It is vitally important to then call the initialize() method on the controls after all the binding is set up to make sure it works correctly. Sometimes by habit you may initialize them directly after construction, but in this case you should wait until all of the bindings have been configured first: g_checkBoxBoolean.initialize(); g_checkBoxDisabled.initialize(); g_textBox.initialize();
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In this example, you will continue looking at binding information between controls but will look a little further into the data transformation by using a custom transformation. In this page there is a text box, a selection list, and a label. When you type something into the text box and tab out of it, the label will display the text you typed using the color specified in the selection list. You can achieve this, as you would expect, through a binding between the label and
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the text box. Additionally, if you change the selection on the list, the label will get updated again, with the new color as well as with a text indicator showing that the update came from the selection list. To do this, you will write a custom transform (using JavaScript) and map it to the binding. You can see the page in Figure 5-6.
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Figure 5-6. Page containing the custom transform
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The complete script for this page is as follows: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <textBox targetElement="textBoxText" /> <select targetElement="selectStyle"> <selectionChanged> <invokeMethod target="setCss" method="evaluateIn" /> </selectionChanged> </select> <label targetElement="labelText"> <bindings> <binding dataContext="textBoxText" dataPath="text" property="text" />
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CHAPTER 5 s USING CLIENT CONTROLS IN ATLAS
<binding id="setCss" dataContext="selectStyle" dataPath="selectedValue" property="cssClass" transform="DoAdditionalHandling" /> </bindings> </label> </components> </page> </script> In this script you can see the initialization of the three components the text box, the select, and the label. The initialization of the text box is straightforward you don t need to do anything special, just point the Atlas control at the underlying HTML tag, which is called textBoxText. You don t specify an ID for the Atlas control, so Atlas gives it the default ID, which is the same as the underlying HTML ID: textBoxText. To initialize the selection list, you use the <select> tag. This is pointed at the underlying HTML <select> list, which is called selectStyle, using the targetElement attribute to specify it. On this you specify an action that occurs upon the selection change. You do this using the <selectionChanged> child tag. This in turn will call a method using the <invokeMethod> tag. The target for this method is setCSS, which, as you will see in a moment, is the name of a binding on the label element. The method attribute is set to evaluateIn, which means the data to be used in this method call is the value of the select box. You will evaluate this input to the selection box and pass that to the setCSS binding. The workhorse of this application is the label element. You can achieve the functionality I have been discussing the update of the label via binding with the text and via binding with the selection list by creating a couple of bindings on the label. The first of these bindings is associated with the element called textBoxText, which is the Atlas identifier for the text box control (see its declaration). The dataPath attribute specifies the property on that control to bind to, which in this case is its text property. The label has a text property too, and you want to update this with whatever is in the text property of the text box. Therefore, you specify the property attribute to be text. With this in place, you have now bound the label to the text box. The second binding on the label is worth another look: <binding id="setCss" dataContext="selectStyle" dataPath="selectedValue" property="cssClass" transform="DoAdditionalHandling" /> This binding has a specific ID, called setCss. You will notice that the other binding wasn t given a specific ID, because it is never being explicitly called from elsewhere. This binding, however, is called from the <invokeMethod> on the selection list. For Atlas to be able to identify it, it needs this identifier. The dataContext attribute points to the control to which you are binding. In this case you want to bind to the selection control, and it is called selectStyle.
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