Show error msg using javascript alert

[richfaceman]

Hi All

I'm using following code to generate the Alert()  this code works to an extend.

<a4j:commandButton id="gI" value="Generate Invoice" action="#{categoryProduct.generateInvoice}"

                         oncomplete="if (#{categoryProduct.errorMsg != ''}) {

                         alert('#{categoryProduct.errorMsg}')

                              }else{

                               location.href='poss_main_screen.jsp';

                              } ">

  </a4j:commandButton>

The probem is,  this part of the code will not work why???     

}else{ location.href='poss_main_screen.jsp';  } ">

No matter what the status of 'errorMsg' is it still shows the alert.

Code in Bean file;

          errorMsg = "Your basket is empty"; else{

}

//code

if  (basketList.isEmpty()) {

}

[ilya40umov]

This string  #{categoryProduct.errorMsg} always has the same value because after ajax call had been completed this EL is not getting any updates. Take a look at this link for the details:

http://seamframework.org/Community/A4jcommandButtonAndAttributeDataUsingJSON