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This element is used to pass a hidden value into a form using an HTML input field of type hidden, as in the following example. $form['my_hidden_field'] = array( '#type' => 'hidden', '#value' => t('I am a hidden field value'), );

If you want to send a hidden value along through the form, it s usually a better idea to use the value element for this, and use the hidden element only when the value element does not suffice. That s because the user can view the hidden element in the HTML source of a web form, but the value element is internal to Drupal and not included in the HTML. Only the #prefix, #suffix, #process (the default is form_expand_ahah), and #value properties are used with the hidden element.

Tip You can generate getters and setters in Eclipse by defining your public variables in the domain object

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The date element, as shown in Figure 10-14, is a combination element with three select boxes: $form['deadline'] = array( '#title' => t('Deadline'), '#type' => 'date', '#description' => t('Set the deadline.'), '#default_value' => array( 'month' => format_date(time(), 'custom', 'n'), 'day' => format_date(time(), 'custom', 'j'), 'year' => format_date(time(), 'custom', 'Y'), ), );

If any input control has the required attribute set, then a value must be set on it before its form can be submitted. For example, to set a text input field as required, simply add the attribute as shown here: <input type="text" id="firstname" name="first" required> If no value is set on this field, either programmatically or by the user, the ability to submit this form is blocked. The required attribute is the simplest type of form validation, but the capabilities of validation are vast. Let s discuss form validation in more detail now.

Figure 10-14. A date field Properties commonly used by the date element are #attributes, #default_value, #description, #prefix, #required, #suffix, #title, and #weight. The #process property defaults to call expand_date(), in which the year selector is hard coded to the years 1900 to 2050. The #element_validate property defaults to date_validate() (both functions can be found in includes/form.inc). You can define these properties when defining the date element in your form to use your own code instead.

<mx:FormItem label="First Name" > <mx:TextInput id="firstNameInput"/> </mx:FormItem> <mx:FormItem label="Last Name"> <mx:TextInput id="lastNameInput"/> </mx:FormItem> <mx:FormItem label="First Name" > <mx:Label id="firstName" text="{contacts.name.first}" fontSize="15" fontWeight="bold" /> </mx:FormItem> <mx:FormItem label="Last Name"> <mx:Label id="lastName" text="{contacts.name.last}" fontSize="15" fontWeight="bold" /> </mx:FormItem> </mx:Form> </mx:Panel> </mx:Application> Figure 4-4 shows the result of running the example in Listing 4-10.

The weight element (not to be confused with the #weight property) is a drop-down used to specify weights: $form['weight'] = array( '#type' => 'weight', '#title' => t('Weight'), '#default_value' => $edit['weight'], '#delta' => 10, '#description' => t('In listings, the heavier vocabularies will sink and the lighter vocabularies will be positioned nearer the top.'), );

The preceding code will be rendered as shown in Figure 10-15.

Before we get too deep into specifics, let s review what form validation really entails. At its core, form validation is a system for detecting invalid control data and flagging those errors for end users. In other words, form validation is a series of checks and notifications that let a user correct the controls of a form before submitting it to the server. But what is form validation, really It is an optimization. Form validation is an optimization because it alone is not sufficient to guarantee that forms submitted to the server are correct and valid. It is an optimization because it is designed to help a web application fail fast. In other words, it is better to notify a user that a page contains invalid form controls right inside the page, using the browser s built-in processing. Why bother with the expense of a network round trip just so the server can inform a user that there was a typo in the data entry If the browser has all the knowledge and capability to catch errors before they leave the client, we should take advantage of that. However, browser form checking is not sufficient to handle all errors.

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