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Data Binding

Posted on Jul 23, 2004 at 02:32 PM 17 Views

Hi

I have a dropdownbyKey Country UIElement. I have created a simpletype called CountryValue and assigned some constant values to it. In the view context i have created a ValueNode called Countrynode and then below that i have created a value attribute called Countryattribute.

If i bind the Country UIElement to this CountryAttribute and try to run the program, The dropDownbybox is disabled and i am not able to Use it. Can anyone suggest what could be the problem.

ravi

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 23, 2004 at 04:59 PM
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    First, let's have a look at the Javadoc:

    /**
 * Web Dynpro AbstractDropDownByKey API.
 *
 * Abstract base class of drop-down list classes with key based context binding.
 * Represents a one-from-many selection visualized by a text field, a button and a drop-down list.
 * The selected value is displayed in the text field, the list of all selectable values is displayed
 * in the drop-down list which appears when the button is pressed.
 * <p>
 * <strong>Data binding:</strong>
 * <br>
 * The set of selectable keys, displayed texts and the selected key are retrieved from a context.
 * This context must provide an attribute <code>y</code> of a type having a value set.
 * The selectable keys of the drop-down list are the keys of this value set,
 * the displayed texts are the corresponding values.
 * The currently selected key is the current value of the attribute <code>y</code>.
 * <p>
 * The property <code>selectedKey</code> must be bound to the attribute <code>y</code>.
 *
 * <p>This type can be called by applications using Web Dynpro, but DO NOT EXTEND OR IMPLEMENT IT!</p>
 *
 * @author SAP
 * @see com.sap.dictionary.runtime.ISimpleType
 * @see com.sap.typeservices.ISimpleValueSet
 * @SAPWebDynproPart 2
 */

    What is the value node in your code good for?

    Armin

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  • author's profile photo Former Member
    Former Member
    Posted on Jul 23, 2004 at 11:16 PM
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    Hi Ravi, you are using the wrong type of dropdown. From your setup, you need to make a dropDownByIndex type dropdown, then you will see all the changes populated.

    The difference is explained more clearly here:

    http://help.sap.com/saphelp_nw04/helpdata/en/74/450e8af57065468e88e4b86de47e4b/content.htm

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