Question

I need to get parameter that is passed in URL with parameter name “ONum” and input its value in orderNum field.

<h:panelGroup>
<h:inputText id="orderNum" value="#{LoginBean.orderNum}" size="18" maxlength="17" tabindex="1" title="Order Number" disabled="#{LoginBean.disableField}"/>
</h:panelGroup>

Before doing that, I need to check for #{LoginBean.orderNum} does not return a value then get the parameter contents from ONum and display it in orderNum text input field.
If it returns a value then ignore doing this.
Please help me in doing this.

Answer 1

An wasy way would be to read the parameter value from the request directly and fill it in the bean.

@SessionScoped
public class LoginBean {

    private String orderNum;

    public String getOrderNum() {
        if (getRequestParameter("onum") != null) {
            orderNum = getRequestParameter("onum");
        }
        return orderNum;
    }       

    private String getRequestParameter(String name) {
        return ((HttpServletRequest)FacesContext.currentInstance().getExternalContext().getRequest()).getParameter(name);
    } 
    // ...

That should be enough.