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Wednesday, 24 December 2014

Update page component in between of event processing in ADF Faces using JavaScript

This post is not about any specific topic of framework, recently i was working in an application, requirement was like this
There is a button on page that uploads a large file to server and it takes some time . So as soon as user press this button it's text should be changed to 'Processing..' and after upload is complete it should be 'Done'




In this post i am sharing same - How to update page component while an event is processing ?
First i have tried it using java means in same button action listener but in this case button text was changed only after event processing is complete
So for this purpose i have used some javascript function, this is quite simple (see the implementation)

  • Drop a button on page and create a ActionListener , it will change button text to 'Done' after event processing (used Thread.sleep() for some long processing)

  •     private RichButton buttonBind;
    
        /**Method to process Action Event
         * @param actionEvent
         */
        public void processValueAction(ActionEvent actionEvent) {
            // Sleep for some time (Event Processing time)
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //After processing set button text to 'Done'
            buttonBind.setText("Done");
            AdfFacesContext.getCurrentInstance().addPartialTarget(buttonBind);
        }
    
        public void setButtonBind(RichButton buttonBind) {
            this.buttonBind = buttonBind;
        }
    
        public RichButton getButtonBind() {
            return buttonBind;
        }
    

  • Now question is how to change button text to 'Processing..' immediately after clicking button. So for this purpose i am using javascript

  • function changeButtonText(event) {
                      var comp = event.getSource();
                      comp.setText('Processing..');
                  }
    

  • Calling this javascript function using af:clientListener in button like this (See XML source of page)

  •  <af:document title="UpdatePageComponent.jspx" id="d1">
                <af:resource type="javascript">
                  function changeButtonText(event) {
                      var comp = event.getSource();
                      comp.setText('Processing..');
                  }
                </af:resource>
                <af:form id="f1">
                    <af:spacer width="10" height="10" id="s1"/>
                    <af:panelGroupLayout id="pgl1" layout="horizontal" halign="center">
                        <af:panelBox id="pb1" showDisclosure="false">
                            <f:facet name="toolbar"/>
                            <af:button text="Click to process" id="b1"
                                       actionListener="#{viewScope.UpdatePageComponent.processValueAction}"
                                       clientComponent="true" binding="#{viewScope.UpdatePageComponent.buttonBind}"
                                       inlineStyle="width:250px;text-align:center;padding:5px;font-weight:bold;">
                                <af:clientListener method="changeButtonText" type="action"/>
                            </af:button>
                        </af:panelBox>
                    </af:panelGroupLayout>
                </af:form>
            </af:document>
    

  • As soon as button is clicked this javascript function will be invoked and set new text in button and after event processing button text is again set by managed bean actionListener.


  • After Clicking button (Event is processing)-

    Processing complete-

Thanks, Happy Learning :)

1 comment :

  1. I have a usecase which i was struggling to get over, If my button is calling two calls(means call 1 and call2 on single button click event) and i would like to see button content to be changed after first call ends or before 2nd call start. Can we achieve this??

    ReplyDelete