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<validationErrorLabel targetElement="validator1" associatedControl="value1TextBox" /> <label targetElement="value1Label"> <bindings> <binding dataContext="value1TextBox" dataPath="text" property="text" /> </bindings> </label> </components> </page> </script> Most of this will look familiar, but you haven t seen a couple of new elements in here. First, a <textBox> control points to value1TextBox, which as you will see from the HTML is the <input> control. A new child element called <validators> is attached to this element. The <validators> tag can contain a number of validators that can be rangeValidator, requiredFieldValidator, typeValidator, rangeValidator, or regexValidator, among others. In this case, you are using a requiredFieldValidator, which fires an error if the field on which the validator is configured is empty. You specify the error message using the errorMessage attribute. A validation error needs to have a source on the page that it uses to represent the error to the user, or it will not be seen. In this example, you have a <span> that contains an asterisk that appears when an error occurs. To achieve this, you use the <validationErrorLabel> tag and associate it with this span. The span is called validator1, so the validationErrorLabel is given this as its targetElement. Finally, this validationErrorLabel needs to be tied to the control that it is the error message destination for, and you achieve this with the associatedControl attribute. Figure 5-11 shows this page after a validation error has been hit. You can see the red asterisk and the tooltip that appears when the user hovers over it. Note that you didn t have to write any code to make this asterisk appear or disappear, and you don t have to write explicit code for the tooltip. The Atlas framework handles all of this for you!
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Figure 5-11. Running the basic validation sample
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Performing Basic Text Validation Checking for Types and Ranges
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In the previous example, you checked to see whether a field was present in your validation rules. This is useful, but for more serious applications, more sophisticated validation is necessary. In this example, you will see what is involved in applying multiple validation rules to a control to not only validate whether you have entered something into it but also to check the data type to ensure you have put in a numeric value and to check that the numeric value falls within a specific range. You can see the page in Figure 5-12.
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Figure 5-12. Compound validation To understand how this compound validation works, let s inspect the code. The HTML is identical to that used in the previous example, so you ll skip straight to the Atlas Script that manages the compound validation: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <textBox targetElement="value1TextBox"> <validators> <requiredFieldValidator errorMessage="You must enter a number." /> <typeValidator type="Number" errorMessage="You must enter a valid number." /> <rangeValidator lowerBound="10" upperBound="20" errorMessage="You must enter a number between 10 and 20." /> </validators> </textBox> <validationErrorLabel targetElement="validator1" associatedControl="value1TextBox" /> <label targetElement="value1Label"> <bindings> <binding dataContext="value1TextBox" dataPath="text" property="text" />
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</bindings> </label> </components> </page> </script> The interesting stuff here is in the <validators> tag for the <textBox> tag, which has three child tags. The first, <requiredFieldValidator>, is similar to what you saw earlier. Should the text box be empty, this validator will fire, and the red asterisk will appear, as shown in Figure 5-13.
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Figure 5-13. Tripping the required field validator
The second, <typeValidator>, is configured to recognize a Number (which can also be String or Boolean). Should you type something that isn t recognized as a numeric into the text box and tab out, this validator will fire, the red asterisk will appear, and the error tag will appear as You must enter a valid number. See Figure 5-14.
CHAPTER 5 s USING CLIENT CONTROLS IN ATLAS
Figure 5-14. Tripping the type validator
The third validator is a <rangeValidator> that, when used with a number, allows you to specify a maximum and a minimum so that if the value falls outside this range, the validation will trip. You configure these with the lowerBound and upperBound attributes. In this case, these values are set to 10 and 20, respectively. Note that these are inclusive, so 10 and 20 are valid values. You can see where this validator is tripped in Figure 5-15. In this case, the text box contains something, so the requiredFieldValidator is OK. It contains a valid number, so the typeValidator is also satisfied. However, the number, 8, is outside the range specified by the rangeValidator, so the red asterisk will appear, and the tooltip gives details of why the data is considered invalid. So, as you can see from this example, you can set up some pretty sophisticated validation rules by stacking validators on top of each other. Where typically you may have programmed rules like this with JavaScript and nested if statements, this declarative approach lends itself nicely for tools to generate these rules.
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