Explain the use of "xfa.resolveNode" in layman's terms
I know this may be a novice question, but can someone please explain when and why xfa.resolveNode is used form design? Is this a form of shorthand to prevent the referencing a parent subform?
Thanks in advance
Hello
There are a few situations when you have to troubleshoot a node.
- When you reference an object that has the same name as other objects in the same container. In the hierarchy, you would see TextField1 [0], TextField1 [1], TextField1 [2], etc. The number in brackets indicates the number of instance of each object. If in your script, you want to reference TextField1 [2], then you will have to solve the node. There is a good reason to name objects as you drag them onto the form.
- You reference an object that is in a container/page/subform without name. The script should solve the container without a name in order to access the object inside. This would also apply if there are several containers with the same name (see 1 above). Again, another good reason for containers of name as you go.
- If you try to refer to a particular instance of an extensible object, then you will have to solve this particular instance. There are several examples of this in the samples of table here: http://assure.ly/lwQHm7.
- If your script is in an object in the main Magi and you reference an object on the Master Page (or visa versa), then you will have to solve the node.
There's the main time that you would solve the node. There may be more, but I don't see any at this point.
Resolve the nodes is unique to JavaScript scripts and not the FormCalc scripts.
SOM stands for script object model. XFA forms have a number of models.
Form the top object is XFA. This means XML Forms Architecture.
Under the present are a number of objects in a strict hierarchy. These are called DOM or Document object models. There is the:
- XFA DOM. You would sometimes script against this model, for example, xfa.resolveNode ().
- Template DOM, which contains information about the form.
- DOM, which contains information about the data structure and content of the data.
- Form DOM, which contains the model data DOM and DOM merged. Most of scripting is done against the form DOM.
- Layout DOM, that contains information specific page for example xfa.layout.pageCount ().
Expressions of script object model (SOM) allow you to access the properties and methods.
This draft is a work in progress (I'll finish later it): http://assure.ly/exTXaZ. The intention is to show how to create SOM expressions in different situations. Right now, it doesn't have any related text in it. Take a look at page 4 and more on expression of SOM.
I hope this helps,
Niall
Tags: Adobe LiveCycle
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