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CHAPTER 5: Interapplication Communication with Scripts Communicating through messages 177

Passing simple types

When your message object’s onResult callback receives a response, it must interpret the string it finds in

the

body of the response message to obtain a result of the correct type. Results of various types can be

identified and processed as follows:

Passing complex types

When returning complex types (arrays and objects), the script that you send must construct a result string,

using the

toSource method to serialize the array or object. In this case, the sender must reconstitute the

array or object by using the

eval method on the result string in the response body.

Passing an array with toSource and eval

For example, the following code sends a script that returns an array in this way. The

onResult callback that

receives the response uses

eval to reconstruct the array.

// Code for send message and handling response

// in the sending application (any message-enabled application)

var idx = 0;

var resArr = new Array;

var bt = new BridgeTalk;

bt.target = "bridge-3.0";

// the script passed to the target application

// needs to return the array using "toSource"

bt.body = "var arr = [10, "this string", 324];

arr.toSource();"

bt.onResult = function(resObj) {

// use eval to reconstruct the array

arr = eval(resObj.body);

Number JavaScript allows you to access a string that contains a number directly as a number, without

doing any type conversion. However, be careful when using the plus operator (

+), which

works with either strings or numbers. If one of the operands is a string, both operands are

converted to strings and concatenated.

String No conversion is required.

Boolean The result string is either “true” or “false.” You can convert it to a true boolean by evaluating it

with the

eval method.

Date The result string contains the date in the form:

"dow mmm dd yyyy hh:mm:ss GMT-nnnn".

For example “Wed Jun 23 2004 00:00:00 GMT-0700”.

Array The result string contains a comma delimited list of the elements of the array. For example, If

the result array is

[12, "test", 432], the messaging framework flattens this into the string

"12,test,432".

As an alternative to simply returning the array, the message target can use the

toSource

method to return the code used to create the array. In this case, the sender must reconstitute

the array by using the

eval method on the result string in the response body. See discussion

below.

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