Package org.apache.tapestry5.corelib.components

Class DateField

  • All Implemented Interfaces:
    ClientElement, Field
    @Import(stylesheet="${tapestry.datepicker}/css/datepicker.css",
        module="t5/core/datefield")
@Events("validate")
public class DateField
extends AbstractField
    A component used to collect a provided date from the user using a client-side JavaScript calendar. Non-JavaScript clients can simply type into a text field. One aspect here is that, because client-side JavaScript formatting and parsing is so limited, we (currently) use Ajax to send the user's input to the server for parsing (before raising the popup) and formatting (after closing the popup). Weird and inefficient, but easier than writing client-side JavaScript for that purpose. Tapestry's DateField component is a wrapper around WebFX DatePicker.
    See Also:
    Form, TextField
    Component Parameters 
    NameTypeFlagsDefaultDefault Prefix
    clientIdString  literal
    Used to explicitly set the client-side id of the element for this component. Normally this is not bound (or null) and org.apache.tapestry5.services.javascript.JavaScriptSupport#allocateClientId(org.apache.tapestry5.ComponentResources) is used to generate a unique client-id based on the component's id. In some cases, when creating client-side behaviors, it is useful to explicitly set a unique id for an element using this parameter. Certain values, such as "submit", "method", "reset", etc., will cause client-side conflicts and are not allowed; using such will cause a runtime exception.
    ensureClientIdUniquebooleanSince 5.4 prop
    A rarely used option that indicates that the actual client id should start with the clientId parameter (if non-null) but should still pass that Id through org.apache.tapestry5.services.javascript.JavaScriptSupport#allocateClientId(String) to generate the final id. An example of this are the components used inside a org.apache.tapestry5.corelib.components.BeanEditor which will specify a clientId (based on the property name) but still require that it be unique. Defaults to false.
    formatjava.text.DateFormatRequired, Not Null literal
    The format used to format and parse dates. This is typically specified as a string which is coerced to a DateFormat. You should be aware that using a date format with a two digit year is problematic: Java (not Tapestry) may get confused about the century.
    hideTextFieldboolean  prop
    If true, then the text field will be hidden, and only the icon for the date picker will be visible. The default is false.
    iconorg.apache.tapestry5.Asset  asset
    Icon used for the date field trigger button. This was used in Tapestry 5.3 and earlier and is now ignored.
    lenientboolean  prop
    When the format parameter isn't used, this parameter defines whether the DateFormat created by this component will be lenient or not. The default value of this parameter is the value of the SymbolConstants#LENIENT_DATE_FORMAT symbol.
    messagesorg.apache.tapestry5.commons.MessagesSince 5.2.0.0componentResources.messagesprop
    Used to override the component's message catalog.
    typeStringNot Null, Since 5.4textliteral
    Allows the type of field to be output; normally this is "text", but can be updated to "date" or "datetime" as per the HTML 5 specification.
    validateorg.apache.tapestry5.FieldValidator  validate
    The object that will perform input validation (which occurs after translation). The translate binding prefix is generally used to provide this object in a declarative fashion.
    valuejava.util.DateRequired prop
    The value parameter of a DateField must be a java.util.Date.

    Component Events 
    NameDescription
    validate 

    Examples

    The DateField component is very easy to use, all the JavaScript is generated for you. Then end result looks like:

    Note: these screenshots are out of date, and reflect an earlier version of Tapestry and a different third-party JavaScript calendar than is currently available.

    Clicking the icon raises the popup calendar:

    DateFieldDemo.tml

    <html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd">
    <body>
        <t:form>
            <div class="t-beaneditor">
                <div class="t-beaneditrow">
                    <t:label for="date"/>
                    <t:datefield t:id="date"/>
                </div>
                <div class="t-beaneditrow">
                    <input type="submit" value="Update"/>
                </div>
            </div>
        </t:form>
    </body>
</html>

    The use of the extra

    elements is to trigger the CSS styles that are usually used as part of a BeanEditForm. Just the <t:datefield> element is all that's really necessary.

    • Method Detail

      • processSubmission

        protected void processSubmission​(String controlName)
        Description copied from class: AbstractField
        Method implemented by subclasses to actually do the work of processing the submission of the form. The element's controlName property will already have been set. This method is only invoked if the field is not disabled.
        Specified by:
        processSubmission in class AbstractField
        Parameters:
        controlName - the control name of the rendered element (used to find the correct parameter in the request)

      • isRequired

        public boolean isRequired()
        Description copied from class: AbstractField
        Returns false; most components do not support declarative validation.
        Specified by:
        isRequired in interface Field
        Overrides:
        isRequired in class AbstractField
        Returns:
        true if a non-blank value is required for the field