working with Query String in GWT

Question

I have to created a dynamic URLcontaining the user id and email parameters, which will direct to sign up form in my GWT application. I want to set and get the parameters in

Answer 1

If you want really want to parse the history token (hash part) to encode parameters, here's the code for that:

private static Map<String, String> buildHashParameterMap() {
    final String historyToken = History.getToken();
    Map<String, String> paramMap = new HashMap<String, String>();
    if (historyToken != null && historyToken.length() > 1) {
        for (String kvPair : historyToken.split("&")) {
            String[] kv = kvPair.split("=", 2);
            if (kv.length > 1) {
                paramMap.put(kv[0], URL.decodeQueryString(kv[1]));
            } else {
                paramMap.put(kv[0], "");
            }
        }
    }

    return paramMap;
}

Answer 2

There is in-built support for getting all of the parameters.

Simply call:

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

Answer 3

Don't think there's a simple tokenized query string parser in GWT. But you can get the raw query string by using:

String queryString = Window.Location.getQueryString();

Parse it any way you like. I use it like this to set debug flags etc.:

boolean debugMode = Window.Location.getQueryString().indexOf("debug=true") >= 0;

Note that changing values in the query part of the url (between the ? and the #) will reload the page. While changing the "hash part" of the url (anything after the #) will not reload the page. Which is why the com.google.gwt.user.client.History uses the hash part.

Answer 4

@Stein, but there is (a query parameter tokenizer in GWT): e.g. Window.Location.getParameter("debug") will return the string value of the parameter debug.