How to create a JavaScriptObject by hand in GWT?

Question

how could i create an JavaScriptObject by hand when i have this class

public class Person extends JavaScriptObject{
    protected Person(){}

    public final native String FirstName()/*-{
        return this.firstName;
    }-*/; 

    public final native String LastName()/*-{
        return this.lastName;
    }-*/;
 }

i am asking because i have an array of this JavaScriptObject Peron

public JsArray<Person> persons = JavaScriptObject.createArray().cast();

and i would like to full this array with some of these Person objects

Peson a = new Person();
a.setfirstName(textField1.getText());
a.setLastName(textField2.getText());
persons.push(a)

but i doesnt know how to create such an object by hand. The values of firstName and lastName i would take from an UI component like an textField. Please help!

krishnakumarp · Accepted Answer · 2012-04-28 11:58:36Z

11

You should be able to do this?

Person a = (Person)JavaScriptObject.createObject().cast();

answered Apr 28, 2012 at 11:58

krishnakumarp

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4 Comments

Pero Over a year ago

Thanks a lot. i have two questions: 1) is there a difference between your and this version -> Person a = Person.createObject()cast(); 2) how could i pass values to the person object? should i create setter methods? but in classes which extends JavaScriptObjects are no variables allowed. so how could i pass the values lastName and firstName to the object?

krishnakumarp Over a year ago

There is no difference between two createObject methods, since it is a static method on JavascriptObject class.

krishnakumarp Over a year ago

For the 2nd question, You extend JavascriptObject to access native JSON objects. The setters would be native calls that assigns the value to native Javascript variables. I think for this reason, they have put a rule that member variables are not allowed in overlay types. Please read developers.google.com/web-toolkit/doc/latest/… for more details.

Pero Over a year ago

class Person extends JavaScriptObject{ protected Person(){} public final native String FirstName()/*-{ return this.firstName; }-/; public final native String LastName()/-{ return this.lastName; }-/; public final native String setFirstName(String fName)/-{ this.firstName = fName; }-/; public final native String setLastName(String lName)/-{ this.lastName = lName; }-*/; } Person a = (Person)JavaScriptObject.createObject().cast(); a.setFirstName("Peter"); a.setLastName("Pan"); public JsArray<Person> persons = JavaScriptObject.createArray().cast(); persons.push(a); thx krishnakumarp

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