Skip to main content

ADF 11g Quicky 3 : Adding Error, Info and Warning messages

How can we add a message programatically ? Last week I got this question for the second time in a months time. I decided to write a short blogpost on how this works.

Adding messages is very easy, you just need to know how it works.
You can add a message to your faces context by creating a new FacesMessage. Set the severity (ERROR, WARNING, INFO or FATAL ), set the message text, and if nessecary a message detail. The fragment below shows the code for an ERROR message.

1:   public void setMessagesErr(ActionEvent actionEvent) {  
2: String msg = "This is a message";
3: AdfFacesContext adfFacesContext = null;
4: adfFacesContext = AdfFacesContext.getCurrentInstance();
5: FacesContext ctx = FacesContext.getCurrentInstance();
6: FacesMessage fm =
7: new FacesMessage(FacesMessage.SEVERITY_ERROR, msg, "");
8: ctx.addMessage(null, fm);
9: }


I created a simple page with a couple of buttons to show the result of setting the message. When the button is pressed the message is shown.
1:  <?xml version='1.0' encoding='UTF-8'?>  
2: <jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
3: xmlns:af="http://xmlns.oracle.com/adf/faces/rich"
4: xmlns:f="http://java.sun.com/jsf/core">
5: <af:inputText label="Label 1" id="it1"></af:inputText>
6: <af:inputText label="Label 2" id="it2"
7: binding="#{pageFlowScope.msgsBean.showMessage}"></af:inputText>
8: <af:inputText label="Label 3" id="it3"></af:inputText>
9: <af:commandButton text="error" id="cb1"
10: actionListener="#{pageFlowScope.msgsBean.setMessagesErr}"/>
11: <af:commandButton text="info" id="cb2"
12: actionListener="#{pageFlowScope.msgsBean.setMessagesInf}"/>
13: <af:commandButton text="warn" id="cb3"
actionListener="#{pageFlowScope.msgsBean.setMessagesWrn}"/>
14: 15: actionListener="#{pageFlowScope.msgsBean.setMessagesFat}"/>
16: <af:commandButton text="warn for comp" id="cb4"
17: actionListener="#{pageFlowScope.msgsBean.setMessagesWrnForComp}"/>
18: </jsp:root>



A special case is the message that is directly related to a component. For that I use the button that calls the "setMessageForComp" method combined with an inputtext field that is bound to a bean : binding="#{pageFlowScope.msgsBean.showMessage}.
The code behind this button is slightly different from the one show in the java fragment earlier. The important part is that the message is specifically added to the component : getShowMessage().getClientId(ctx).

1:   public void setMessagesWrnForComp(ActionEvent actionEvent) {  
2: // Add event code here...c
3: String msg = "This is a message";
4: AdfFacesContext adfFacesContext = null;
5: adfFacesContext = AdfFacesContext.getCurrentInstance();
6: FacesContext ctx = FacesContext.getCurrentInstance();
7: FacesMessage fm =
8: new FacesMessage(FacesMessage.SEVERITY_WARN, msg, "");
9: ctx.addMessage(getShowMessage().getClientId(ctx), fm);
10: }
11: public void setShowMessage(RichInputText showMessage) {
12: this.showMessage = showMessage;
13: }
14: public RichInputText getShowMessage() {
15: return showMessage;
16: }
17: public void setMessagesWrnForComp(ActionEvent actionEvent) {
18: // Add event code here...c
19: String msg = "This is a message";
20: AdfFacesContext adfFacesContext = null;
21: adfFacesContext = AdfFacesContext.getCurrentInstance();
22: FacesContext ctx = FacesContext.getCurrentInstance();
23: FacesMessage fm =
24: new FacesMessage(FacesMessage.SEVERITY_WARN, msg, "");
25: ctx.addMessage(getShowMessage().getClientId(ctx), fm);
26: }
27: public void setShowMessage(RichInputText showMessage) {
28: this.showMessage = showMessage;
29: }
30: public RichInputText getShowMessage() {
31: return showMessage;
32: }





The code for this quicky can be downloaded here.

Comments

Mikeyoakes said…
Gret piece Luc - I needed to quickly find something for adding an In Context Error Message on the ADF BPM Task Flow screen I am working on and this helped greatly. Keep up the great work - it is appreciated.
Anonymous said…
Hello ,acer! I faced one problem in my project, can you help me ?
yeah, i create a popup and put one dialog in it. In the inspector panel
i set "Type" to none, that means the deafult ok button and cancel button
would not show, but after running my jspx page, i found that there exist
a line of blank, and it is obviously.That`s looks so bad, how can i figure
this? :)

Waiting for your answer, thanks & best regards!
My Email: gragonc@163.com

Popular posts from this blog

ADF 12.1.3 : Implementing Default Table Filter Values

In one of my projects I ran into a requirement where the end user needs to be presented with default values in the table filters. This sounds like it is a common requirement, which is easy to implement. However it proved to be not so common, as it is not in the documentation nor are there any Blogpost to be found that talk about this feature. In this blogpost I describe how to implement this.

The Use Case Explained
Users of the application would typically enter today's date in a table filter in order to get all data that is valid for today. They do this each and every time. In order to facilitate them I want to have the table filter pre-filled with today's date (at the moment of writing July 31st 2015).


So whenever the page is displayed, it should display 'today' in the table filter and execute the query accordingly. The problem is to get the value in the filter without the user typing it. Lets first take a look at how the ADF Search and Filters are implemented by the f…

How to: Adding Speech to Oracle Digital Assistant; Talk to me Goose

At Oracle Code One in October, and also on DOAG in Nurnberg Germany in November I presented on how to go beyond your regular chatbot. This presentation contained a part on exposing your Oracle Digital Assistant over Alexa and also a part on face recognition. I finally found the time to blog about it. In this blogpost I will share details of the Alexa implementation in this solution.
Typically there are 3 area's of interest which I will explain. Webhook Code to enable communication between Alexa and Oracle Digital AssistantAlexaDigital Assistant (DA) Explaining the Webhook Code The overall setup contains of Alexa, a NodeJS webhook and an Oracle Digital Assistant.
The webhook code will be responsible for receiving and transforming the JSON payload from the Alexa request. The transformed will be sent to a webhook configured on Oracle DA. The DA will send its response back to the webhook, which will transform into a format that can be used by an Alexa device. To code exposes two REST …