Package org.apache.tapestry5.corelib.components

Class TextField

  • All Implemented Interfaces:
    ClientElement, Field
    public class TextField
extends AbstractTextField
    TextField component corresponds to <input> element. The value parameter will be edited (read when the containing Form is rendered, and updated when the form is submitted). TextField is generally used with string values, but other values are acceptable, as long as they can be freely converted back and forth to strings. Includes the size attribute, if a Width annotation is present on the property bound to the value parameter.
    Component Parameters 
    NameTypeFlagsDefaultDefault Prefix
    annotationProviderorg.apache.tapestry5.commons.AnnotationProvider  prop
    Provider of annotations used for some defaults. Annotation are usually provided in terms of the value parameter (i.e., from the getter and/or setter bound to the value parameter).
    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.
    nullsorg.apache.tapestry5.NullFieldStrategy defaultnullfieldstrategy
    Defines how nulls on the server side, or sent from the client side, are treated. The selected strategy may replace the nulls with some other value. The default strategy leaves nulls alone. Another built-in strategy, zero, replaces nulls with the value 0.
    translateorg.apache.tapestry5.FieldTranslatorRequired, Not Null translate
    The object which will perform translation between server-side and client-side representations. If not specified, a value will usually be generated based on the type of the value parameter.
    typeStringNot Nulltextliteral
    Sets the type attribute of the <input> element. The default is "text", but this can be overridden when using HTML5 types such as "number".
    validateorg.apache.tapestry5.FieldValidatorNot Null validate
    The object that will perform input validation (which occurs after translation). The validate binding prefix is generally used to provide this object in a declarative fashion.
    valueObjectRequired prop
    The value to be read and updated. This is not necessarily a string, a translator may be provided to convert between client side and server side representations. If not bound, a default binding is made to a property of the container matching the component's id. If no such property exists, then you will see a runtime exception due to the unbound value parameter.

    Component Events 
    NameDescription
    parseClient 
    toClient 
    validate 

    Related Components

    Examples

    Once again, we're basing the example on the order payment screen from the Radio examples. This time we're focusing in on the text field used for entering the credit card number, and we're going to validate that number using a regular expression:

    Payment.tml (partial)

                <t:label for="cardNumber"/>:
            <t:textfield t:id="cardNumber"  validate="required,regexp" size="20"/>

    The validate parameter is used to specify validations for the field. When it is omitted, the @Validate annotation of the property is used (if present). In any case, this references two of the built-in validations: "required" and "regexp".

    This example presumes that the Payment page includes a property named "cardNumber".

    The "required" validation requires no extra configuration. On the other hand, "regexp" needs to know the regular expression to enforce ... and it should also have a user presentable message.

    Payment.properties (partial)

    cardnumber-regexp-message=Credit Card numbers consist of 16 digits
cardnumber-regexp=\\d{4}(\\-?\\d{4}){3}

    Tapestry uses the page's message catalog as a source of extra validation information. The key is the component id, the name of the validation. The value is given to the validator object ... here it's the regular expression for a credit card number (four sets of four digits, optionally seperated by dashes). The "-message" entry allows the normal error message for the validator to be overridden.

    Notes

    These same approaches apply consistently to all form control element components.