Search code examples
jsfjsf-2managed-bean

Getting id of item in list<object> in JSF

I don't have any idea what approach and how I should start coding to get the id of a specific object item when a form button is clicked.

enter image description here

The Product Id values showing are primary keys of the product table I created. I'm coming from Swing programming and in Swing I can easily use the JLabel.getText(); to get the product Ids 1,4,5,6 shown on the screenshot. But I guess it's different with JSF.

Also, these object values are contained in a ui:repeat loop

frames.xhtml

<ui:repeat value="#{frameBean.all}" var="f" varStatus="loop">
            <h:outputText escape="false" rendered="#{loop.index % 3 == 0}" />
            <div >
                <div class="col-sm-6 col-md-3">
                    <div class="thumbnail clearfix">
                        <img src="..." alt="frame image placeholder" width="240" height="180"/>
                            <div class="caption">
                                <p>
                                    <h:outputLabel>Product ID: </h:outputLabel>
                                    <h:outputText value="#{f.product_id}"/>
                                </p>
                                <p><h:outputLabel value="#{f.name}"/></p>
                                <p><h:outputText value="#{f.description}"/></p>
                                <p>
                                    <h:panelGroup rendered="#{login.userRole eq 'customer' or login.userRole eq null}">
                                        <a href="#" class="btn btn-primary pull-right" role="button">Add To Cart</a> 
                                    </h:panelGroup>
                                </p>
                            </div>
                    </div>
                </div>
            </div>
            <h:outputText escape="false" rendered="#{loop.last or (loop.index + 1) % 3 == 0}" />
        </ui:repeat>

Surely, I can use the f.product_Id but how can I get a specific Id if Add To Cart button is clicked?

Here's the implementation containing the getAll() frames method

public List<Frame> getAll() throws SQLException {
        List<Frame> list = new ArrayList<>();

        PreparedStatement ps = null;
        try {
            String SQL = "select product_id, name, description, price_per_sqft, material from product where isFrame = 1";
            ps = con.prepareStatement(SQL);

            //get customer data from database
            ResultSet result = ps.executeQuery();
            while (result.next()) {
                Frame frame = new Frame();

                frame.setProduct_id(result.getInt("product_id"));
                frame.setName(result.getString("name"));
                frame.setDescription(result.getString("description"));
                frame.setPrice_per_sqft(result.getDouble("price_per_sqft"));
                frame.setMaterial(result.getString("material"));

                //store all data into a List
                list.add(frame);
            }
        } catch (SQLException | HeadlessException e) {
            e.printStackTrace();

        } finally {
            try {
                con.close();
                ps.close();
            } catch (Exception e) {
                e.printStackTrace();

            }
        }

        return list;
    }

For the purpose of obtaining the product Id of the frame I'm thinking of creating an addToCart(int aProductId) method. It will require aProductId argument.

Thank you.

Solution

  • You can use f:param component for store the product id 

    <p>
    <h:outputLabel>Product ID: </h:outputLabel>
    <h:outputText value="#{f.product_id}"/>
    <f:param name="productId" value=""#{f.product_id}""></f:param>
</p>

    and later in the bean you can get the value by using FacesContext

    String propertyId = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap()
                .get("productId");