vb.net code 128 HTML generated from expression-based HtmlHelper methods in .NET framework

Printing Code 128B in .NET framework HTML generated from expression-based HtmlHelper methods

Listing 3.11 HTML generated from expression-based HtmlHelper methods
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<label for="UserName">User name</label> <input id="UserName" name="UserName" type="text" value="" />
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For our page to pass accessibility validation, every input element (such as the first line in listing 3.11) needs to include a corresponding label element (such as the second line). Because our label and input elements are generated using expressions, we no longer need to worry about hard-coding label and input names. The HtmlHelper extensions designed for strongly typed views (including those used in the preceding code) are listed in table 3.1. Because our form was generated using a strongly typed view, we can take advantage of this in the design of our action that the form posts to. Rather than enumerating every input field as a separate action method parameter, we can bind all the parameters to the same view model we used to render the view, as shown in listing 3.12.
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Displaying view model data in a view
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Table 3.1 HTML helpers in ASP.NET MVC 2 HTML helper Description Returns HTML markup for each property in the object that s represented by the expression Returns HTML markup for each property in the object that s represented by the specified expression
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DisplayFor DisplayTextFor EditorFor CheckBoxFor DropDownListFor HiddenFor LabelFor ListBoxFor
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Returns an HTML input element for each property in the object that s represented by the specified expression Returns a check box input element for each property in the object that s represented by the specified expression. Returns an HTML select element for each property in the object that s represented by the specified expression using the specified list items Returns an HTML hidden input element for each property in the object that s represented by the specified expression Returns an HTML label element and the property name of the property that s represented by the specified expression Returns an HTML select element for each property in the object that s represented by the specified expression and uses the provided data for the list items Returns a password input element for each property in the object that s represented by the specified expression Returns a radio button input element for each property in the object that s represented by the specified expression Returns an HTML text area element for each property in the object that s represented by the specified expression Returns a text input element for each property in the object that s represented by the specified expression Retrieves the validation metadata and validates each data field that s represented by the specified expression Returns the HTML markup for a validation-error message for each data field that s represented by the specified expression
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PasswordFor RadioButtonFor TextAreaFor TextBoxFor ValidateFor ValidationMessageFor
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Listing 3.12 The signature of the LogOn action using the view model as a parameter
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public ActionResult LogOn(LogOnModel model, string returnUrl) { // Action method body here ... }
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As you can see, our LogOn action method takes a single LogOnModel object, as well as the potential return URL, instead of a method parameter for each input element on our form.
View fundamentals
As powerful as the HtmlHelper extensions for strongly typed views can be, we still introduce quite a bit of duplication in our views if we rely solely on these extensions for generating HTML. For example, if every input element requires a corresponding label, why not always include it Every user interface is different, so the MVC team can t predict the layout everyone wants to use for input and label elements. Instead, we can take advantage of a new feature in ASP.NET MVC 2 templates to enforce a standardized approach to generating HTML.
Using strongly typed templates
As we move toward using strongly typed views based on a presentation model, we ll start to see more and more patterns emerge. If a view model object has a Boolean property on a form, we ll almost certainly want to display a check box on a form. Email addresses should always render the same way, as should password fields and so on. It s rare that an input element won t also include the corresponding validation message. HtmlHelper extension methods work well for individual snippets of HTML elements, but tend not to scale when the generated HTML starts to become more complex and include more varieties of elements. ASP.NET MVC 2 gives us a way to start basing our rendering decisions on model metadata. An example of this is marking our view model with a RequiredAttribute so that it will be automatically validated. The framework also provides ways to generate snippets of HTML based on properties of our view model. With ASP.NET MVC 2, the MVC team designed a view feature that tends to sit between HtmlHelper extension methods and full-blown partials in size and scope. This feature is templated helpers, and it s designed to assist in generating HTML based on strongly typed views. Templated helpers can be used to generate HTML for the entire model or for one member at a time. Because HTML for viewing and editing are radically different, generating templates for each is accomplished through two different sets of methods, with two different sets of templates.
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