Consuming a JSONP service response

When a message flow is configured to use the JSON domain, the JSON parser automatically detects JSONP messages. The JSON parser puts the JSON padding in the top level Padding element, and the JSON data under the Data element.

Before you begin

Before completing this task, read the following overview topics about JSON:

About this task

You can process both JSON and JSONP messages in a single message flow, because the parser puts the JSON data under the Data element in the message tree. If JSONP padding is detected, the name of the client-side script is placed in the top level Padding element.

Follow these steps to test for the presence of padding:

Procedure

  1. Create a message flow with an HTTPInput node, an HTTPReply node, and your choice of a Computeor JavaCompute node.
  2. On the Input Message Parsing tab of your HTTPInput node, set the Message domain property to JSON : For JavaScript Object Notation messages.
  3. Insert the following code, as appropriate:
    • If your message flow uses a Compute node:
      DECLARE PaddingRef REFERENCE TO InputRoot.JSON.Padding
IF LASTMOVE(PaddingRef) THEN
   -- JSON Padding is present
ELSE
    -- No JSON Padding present
END IF;
    • If your message flow uses a JavaCompute node:
      if (message.getRootElement().getFirstElementByPath("JSON/Padding") != null){
    //JSON Padding is present
}
else{
    //No JSON Padding
}