在JSF或Primefaces数据表中编辑哈希图

Question

I have an object that represents a service provider. In that object I have this hashmap

private Map<MetaDataKeys, String> metaData;

The "MetaDatatKeys" is a enum that looks like this,

public enum MetaDataKeys {
    PROVIDER_NAME, PROVIDER_CONTACT_NAME, PROVIDER_SERVICE_RADIUS;
}

I would like to display the hashmap key/value pairs in a datatable or similar for editing, something along the lines of,

            <p:dataTable id="providerDatatable" var="infoMap" value="#{editUserBean.editUser.metaData}">
                <p:column><h:outputText value="#{infoMap.key.metaData}"/></p:column>
                <p:column><h:inputText value="#{infoMap.key.value}"/></p:column>
            </p:dataTable>

In my backing bean "editUser" is the object that contains the map.

what is the best way to go about this? I have not been successful in even getting the table to render and populate with values. In searching most examples use a string or a primitive for the key.

Answer 1

You should make iteration in the datatable by Map.entrySet() it's better way. If you try to do itaration by Map.keySet() and than take value by key you can take O(n^2).

For your task realisation looks like:

<p:dataTable id="providerDatatable" var="infoMap" value="#{editUserBean.editUser.metaData.entrySet()}">
    <p:column><h:outputText value="#{infoMap.key}"/></p:column>
    <p:column><h:inputText value="#{infoMap.value}"/></p:column>
</p:dataTable>

To edit table row you can you use p:cellEditor more info about this component you can find at the Primefaces show case