Window Location getParameter is always null in GWT/GXT Project?

问题

I am working GWT/GXT I am trying to practise some sample Examples.

This is url of the project

http://127.0.0.1:8888/Opera_Star.html?gwt.codesvr=127.0.0.1:9997

public void onModuleLoad() {
        Map<String, Entry> project = new FastMap<Entry>();
        ProjectModel projectModel = new ProjectModel();
        for (int i = 0; i < projectModel.getChildren().size(); i++) {// 1 children
            LoginCategory loginCategory = (LoginCategory) projectModel
                    .getChildren().get(i);
            for (int j = 0; j < loginCategory.getChildren().size(); j++) {// 2 children
                Entry entry = (Entry) loginCategory.getChildren().get(j);
                project.put(entry.getId(), entry);
            }
        }   
        Registry.register(MODEL, projectModel);
        String id = Window.Location.getParameter("id");
        if (id == null) {
            id = XDOM.getBody().getId();
        }    
        Entry entry = project.get(id);    
        if (entry == null) {
            return;
        }

Can Anybody tell me What is String id = Window.Location.getParameter("id");, How to setParameter for Windows.Location

What is id = XDOM.getBody().getId();

I am getting Id null.

回答1:

Add below code in your EntryPoint class

private static Map<String, String> queryParams = new HashMap<String, String>();

static {
    Map<String, List<String>> paramsMap = Window.Location.getParameterMap();
    for (String key : paramsMap.keySet()) {
        List<String> values = paramsMap.get(key);
        if (values.size() > 0) {
            String value = values.get(0);
            queryParams.put(key.toLowerCase(), value);
            queryParams.put(key, value);
        }
    }
}

I dont have &id=foo in the url, how to add it in the URL?

Change URL in browser address bar without reload existing page
Modify the URL without reloading the page

How to get the host page base URL?

GWT.getHostPageBaseURL(); //http://127.0.0.1:8888/

回答2:

Window.Location.getParameter parses the URL's query-string into name-value pairs.

So Window.Location.getParameter("id") would return foo if the URL had id=3 in the query-string (e.g. ?id=foo or ?gwt.codesvr=127.0.0.1:9997&id=foo)

I don't know what XDOM is, but I guess XDOM.getBody().getId() is no different form Document.get().getBody().getId(), so it would return the value of an id attribute on the <body> element (e.g. <body id=foo>)

来源：https://stackoverflow.com/questions/23341793/window-location-getparameter-is-always-null-in-gwt-gxt-project

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gwt

gwt2

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