Module jdk.jsobject
Package netscape.javascript

Class JSObject

java.lang.Object
netscape.javascript.JSObject
public abstract class JSObject
extends Object

Allows Java code to manipulate JavaScript objects.

When a JavaScript object is passed or returned to Java code, it is wrapped in an instance of JSObject. When a JSObject instance is passed to the JavaScript engine, it is unwrapped back to its original JavaScript object. The JSObject class provides a way to invoke JavaScript methods and examine JavaScript properties.

Any data returned from the JavaScript engine to Java is converted to Java data types. Certain data passed to the JavaScript engine is converted to JavaScript data types.

  • Constructor Details

    • JSObject

      protected JSObject()
      Constructs a new JSObject. Users should neither call this method nor subclass JSObject.

  • Method Details

    • call

      public abstract Object call​(String methodName, Object... args) throws JSException
      Calls a JavaScript method. Equivalent to "this.methodName(args[0], args[1], ...)" in JavaScript.
      Parameters:
      methodName - The name of the JavaScript method to be invoked.
      args - the Java objects passed as arguments to the method.
      Returns:
      Result of the method.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • eval

      public abstract Object eval​(String s) throws JSException
      Evaluates a JavaScript expression. The expression is a string of JavaScript source code which will be evaluated in the context given by "this".
      Parameters:
      s - The JavaScript expression.
      Returns:
      Result of the JavaScript evaluation.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • getMember

      public abstract Object getMember​(String name) throws JSException
      Retrieves a named member of a JavaScript object. Equivalent to "this.name" in JavaScript.
      Parameters:
      name - The name of the JavaScript property to be accessed.
      Returns:
      The value of the propery.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • setMember

      public abstract void setMember​(String name, Object value) throws JSException
      Sets a named member of a JavaScript object. Equivalent to "this.name = value" in JavaScript.
      Parameters:
      name - The name of the JavaScript property to be accessed.
      value - The value of the propery.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • removeMember

      public abstract void removeMember​(String name) throws JSException
      Removes a named member of a JavaScript object. Equivalent to "delete this.name" in JavaScript.
      Parameters:
      name - The name of the JavaScript property to be removed.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • getSlot

      public abstract Object getSlot​(int index) throws JSException
      Retrieves an indexed member of a JavaScript object. Equivalent to "this[index]" in JavaScript.
      Parameters:
      index - The index of the array to be accessed.
      Returns:
      The value of the indexed member.
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.

    • setSlot

      public abstract void setSlot​(int index, Object value) throws JSException
      Sets an indexed member of a JavaScript object. Equivalent to "this[index] = value" in JavaScript.
      Parameters:
      index - The index of the array to be accessed.
      value - The value to set
      Throws:
      JSException - when an error is reported from the browser or JavaScript engine.