# Java Script pane

The **Java script** pane is the editing area for writing your code. You can insert constants, functions, input fields, and output fields from the **Java script functions** pane on the left by double-clicking the node you want to insert or by using drag-and-drop to place the object onto the **Java Script**panel.

| Field                  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Position**           | Display the line number and position of the cursor.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| **Compatibility Mode** | <p>Select the <strong>Compatibility mode</strong>option to use the <code>2.5</code> version of the JavaScript engine. When this option is not selected (default), the step uses version 3 of the JavaScript engine.</p><p>In the 2.5 engine, value objects are directly modifiable and their type can be changed. For example, you can convert a date variable into a string. This is not supported in the 3.0 engine, so the JavaScript should run faster. For more details on the different versions, see Migrating JavaScript from 2.5.x to 3.0.0.</p><p>PDIPDI uses the Rhino engine from Mozilla.</p> |
| **Optimization level** | <p>Select the level of JavaScript optimization. The values are:</p><ul><li><strong>1</strong></li></ul><p>JavaScript runs in interpreted mode.</p><ul><li><strong>0</strong></li></ul><p>No optimizations are performed.</p><ul><li><strong>1-9</strong></li></ul><p>All optimizations are performed. 9 performs the most optimization with faster script execution, but compiles slower. The default is 9.</p>                                                                                                                                                                                            |


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