JSObject
The public final class netscape.javascript.JSObject extends Object.
java.lang.Object
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+----netscape.javascript.JSObject
Description
JavaScript objects are wrapped in an instance of the class netscape.javascript.JSObject and passed to Java. JSObject allows Java to manipulate JavaScript objects.
When a JavaScript object is sent to Java, the runtime engine creates a Java wrapper of type JSObject; when a JSObject is sent from Java to JavaScript, the runtime engine unwraps it to its original JavaScript object type. The JSObject class provides a way to invoke JavaScript methods and examine JavaScript properties.
Any JavaScript data brought into Java is converted to Java data types. When the JSObject is passed back to JavaScript, the object is unwrapped and can be used by JavaScript code. See the Core JavaScript Guide for more information about data type conversions.
Method Summary
The netscape.javascript.JSObject class has the following methods:
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Method
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Description
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call
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Calls a JavaScript method.
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equals
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Determines if two JSObject objects refer to the same instance.
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eval
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Evaluates a JavaScript expression.
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getMember
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Retrieves the value of a property of a JavaScript object.
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getSlot
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Retrieves the value of an array element of a JavaScript object.
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removeMember
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Removes a property of a JavaScript object.
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setMember
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Sets the value of a property of a JavaScript object.
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setSlot
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Sets the value of an array element of a JavaScript object.
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toString
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Converts a JSObject to a string.
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The netscape.javascript.JSObject class has the following static methods:
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Method
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Description
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getWindow
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Gets a JSObject for the window containing the given applet.
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The following sections show the declaration and usage of these methods.
call
Method. Calls a JavaScript method. Equivalent to "this.methodName(args[0], args[1], ...)" in JavaScript.
Declaration
public Object call(String methodName,
Object args[])
equals
Method. Determines if two JSObject objects refer to the same instance.
Overrides: equals in class java.lang.Object
Declaration
public boolean equals(Object obj)
Backward Compatibility
JavaScript 1.3. In JavaScript 1.3 and earlier versions, you can use either the equals method of java.lang.Object or the == operator to evaluate two JSObject objects.
In more recent versions, the same JSObject can appear as different Java objects. You can use the equals method to determine whether two JSObjects refer to the same instance.
eval
Method. Evaluates a JavaScript expression. The expression is a string of JavaScript source code which will be evaluated in the context given by "this".
Declaration
public Object eval(String s)
getMember
Method. Retrieves the value of a property of a JavaScript object. Equivalent to "this.name" in JavaScript.
Declaration
public Object getMember(String name)
getSlot
Method. Retrieves the value of an array element of a JavaScript object. Equivalent to "this[index]" in JavaScript.
Declaration
public Object getSlot(int index)
getWindow
Static method. Returns a JSObject for the window containing the given applet. This method is useful in client-side JavaScript only.
Declaration
public static JSObject getWindow(Applet applet)
removeMember
Method. Removes a property of a JavaScript object.
Declaration
public void removeMember(String name)
setMember
Method. Sets the value of a property of a JavaScript object. Equivalent to "this.name = value" in JavaScript.
Declaration
public void setMember(String name,
Object value)
setSlot
Method. Sets the value of an array element of a JavaScript object. Equivalent to "this[index] = value" in JavaScript.
Declaration
public void setSlot(int index,
Object value)
toString
Method. Converts a JSObject to a String.
Overrides: toString in class java.lang.Object
Declaration
public String toString()
JSException
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