GWT: Capturing URL parameters in GET request

Question

I need to build a GWT application that will be called by an external application with specific URL parameters.

For example:

http://www.somehost.com/com.app.client.Order.html?orderId=99999.

How do I capture the orderId parameter inside the GWT application?

Solution 1

Try,

String value = com.google.gwt.user.client.Window.Location.getParameter("orderId");
// parse the value to int

P.S. GWT can invoke native javascript which means if javascript can do the stuff, GWT can do it too; e.g. in GWT, you can write

public static native void alert(String msg)
/*-{
 $wnd.alert("Hey I am javascript");
}-*/;

In this case, you can even use existing javascript lib to extract param's value in the querystring.

Solution 2

GWT has a facility to get params from the URL:

String value = Window.Location.getParameter("param");

Make sure your URLs are in the form of:

http://app.com/?param=value#place instead of http://app.com/#place&param=value

In order to get all params in a map, use:

Map<String, List<String>> map = Window.Location.getParameterMap();

Solution 3

I suggest you to use GWT MVP . Assume that your url as

http://www.myPageName/myproject.html?#orderId:99999

And in your AppController.java --

Try as

    ......
    public final void onValueChange(final ValueChangeEvent<String> event) {
    String token = event.getValue();

    if (token != null) {
        String[] tokens = History.getToken().split(":");
        final String token1 = tokens[0];
        final String token2 = tokens.length > 1 ? tokens[1] : "";

        if (token1.equals("orderId") && tonken2.length > 0) {
            Long orderId = Long.parseLong(token2);
            // another your operation
        }
    }
}
...........

Another option , you can also use with Spring MVC. Here is an example ...

// Below is in your view.java or presenter.java

Window.open(GWT.getHostPageBaseURL() + "customer/order/balance.html?&orderId=99999",
            "_self", "enable");

// Below code in in your serverside controller.java

@Controller
@RequestMapping("/customer")
public class ServletController {
@RequestMapping(value = "/order/balance.html", method = RequestMethod.GET)
public void downloadAuctionWonExcel(@RequestParam(value = "orderId", required = true) final String orderId,
    final HttpServletResponse res) throws Exception {
    try {
        System.out.println("Order Id is "+orderId);
        // more of your service codes
        }
        catch (Exception ex) {
        ex.printStackTrace();
        }
  }
}

Comments

[quarks]

@codemeit, where to put this in the gwt code? In the main entry point? For example, I have mygwtapp.com/process.html?query=123 that will be called by some other web app, or just hand written in the browser bar.

[eQ19]

This method Window.Location.getParameter("param") works best for my GWT application since it can be placed everywhere.