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Disable the Back Button in browser

Reuirment-To Disable the Browser Back Button you need to use java script code in your jsp page.

For example, You have Page 1 and Page 2 .And you are navigation from page1 to page 2.now you click on browser bck button.
We need to disable this thing.We will be writing a javascript code into the page 1.We will use forward method.Let check what does it do-

forward()– method loads the next URL in the history list.This is the same as clicking the Forward button in the browser.JavaScript window history forward method provides the functionality to navigate the user to the next page visited by him. Actually history forward method works only if the user navigates to the previous page using back button of browser of history back method provided by JavaScript. This back history navigation enables the forward history navigation. JavaScript History object belongs to JavaScript window object that allows you to access the forward method using window.history.forward. You can also access the forward method directly as history.forward.

<script type ="text/javascript">
function stopGoingBack()
{
window.history.forward();
}
</script>

<html>
    <head>
    <title> Using the forward method of the History object</title>
    </head>
    <body>
    <form name=form1>
    Click on the button to go to the forward browser page.
    <input type="button" value="Go Forward" onload='stopGoingBack()'>
    </form>
    </body>
    </html>

Call this method on onload on the body of page.

Happy coding with techartifact with Vinay . 🙂

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Generate id using dbsequence in Oracle ADF Without Losing it .

Requirements: Populate Primary key or ID using dbsequence in Oracle ADF only during database commit

Solution: In my previous post of generating the sequence generating sequence in ADF ,previous post ,But the problem is you will lose sequence at time of error or cancel time.

Following changes to achieve this requirement

1. Go the entity and put a default value as some -999 or -9999 (This cant be your dbsequence value, preferably negative values)

2. Generate EntityImpl.class file and add below lines of code to the file at the end.

Note: Here we are overriding doDML() method of EntityImpl.class so that it will the get the value from db sequence just before commit to database.

    public void doDML(int operation, TransactionEvent e) {
        this.setEmployeeId((Integer)(new SequenceImpl("Vinaytableid_seq",getDBTransaction()).getSequenceNumber()).intValue());
        super.doDML(operation, e);
    }

Note2: it is not a mandatory rule to modify doDML() method only, you can use prepareForDML() method as well if you like. As doDML() is the last method that gets fired before beforeCommit() method, I preferred it.

3. In UI page, users don’t want to see any negative values initially, to show it as blank, just put an ELExpression to hide it whenever the value is negative.i.e
#{bindings.ContractId.inputValue == -1 ? ” : bindings.EmployeeId.inputValue}

Happy coding with techartifact

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Handling OK and Cancel button in af:dialog using popup in Oracle ADF by dialogListener

Requirement – We are displaying a popup message to user and on selecting on OK and CANCEl by user , writing custom code inside bean

Solution – You can have af:popup component in the page .Inside the popup , drag drop af:dialog component. You can call the pop up programmatic using my
another post of popup

For the dialog , you need to have some dialog listener. write it like 

<af:dialog title="handling Ok and cancel event}"
           type="okCancel"
           dialogListener="#{techartifact.headerManage.dialogListener1}"
           id="d1">

The method of dialogListener1 can be written as below.Write inside a headerManage bean.

public void dialogListener1(DialogEvent dialogEvent)
  {
    if (dialogEvent.getOutcome() == DialogEvent.Outcome.ok)
    {
     // write your custom code for ok event
    } else
    {
      // write your custom code for cancel event
   } 
  }

Happy coding with techartifact….