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Copyright © 2016 M/Gateway Developments Ltd
EWD 3 Training Course
Part 21
JavaScript Abstraction of Global Storage:
(b) Persistent JavaScript Objects
Rob Tweed
Director, M/Gateway Developments Ltd
Twitter: @rtweed
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
Can we then refer to: myDoc.d.e2.f3 ?
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
Is a DocumentNode Object
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Would also have to be a DocumentNode Object
This would mean we'd have to know that the 'd' property was, or could be, a valid node
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Would also have to be a DocumentNode Object
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Would also have to be a DocumentNode Object
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
BUT: Impossible to predict or determine in advance all the
possible subscripts of a Global
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
BUT: Impossible to predict or determine in advance all the
possible subscripts of a Global
•No schema to tell us
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.d.e2.f3
BUT: Impossible to predict or determine in advance all the
possible subscripts of a Global
•No schema to tell us
•could be hundreds of thousands, or millions of subscript values
and any number of levels of hierarchy
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
var myDoc = new this.documentStore.DocumentNode( 'myDoc');
myDoc.x.value
Also: can't create properties automatically using subscript names
as these might clash with DocumentNode property or method names
as in the case above
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
myDoc("x","value")="hello world"
Copyright © 2016 M/Gateway Developments Ltd
$() Function
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
$() Function
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
$() Function
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
$():
- Returns a DocumentNode Object representing the specified sub-node
of the parent DocumentNode
Copyright © 2016 M/Gateway Developments Ltd
$() Function
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = new this.documentStore.DocumentNode('myDoc', [ 'd']);
This does the same thing, but is much more verbose
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
Chaining $() Functions
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
Chaining $() Functions
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
var e2Node = dNode.$('e2');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
Chaining $() Functions
var myDoc = new this.documentStore.DocumentNode('myDoc');
var dNode = myDoc.$('d');
var e2Node = myDoc.$('d').$('e2');
Does the same thing by chaining
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
Chaining $() Functions
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
A DocumentNode represented by $d was instantiated as a property of
the myDoc DocumentNode
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
A DocumentNode represented by $d was instantiated as a property of
the myDoc DocumentNode
Now accessible as myDoc.$d
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
A DocumentNode represented by $e2 was instantiated as a property of myDoc.$d
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
A DocumentNode represented by $e2 was instantiated as a property of myDoc.$d
Now accesible as myDoc.$d.$e2
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Only need to use $() once for any specific subscript
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
var f2Node = myDoc.$('d').$('e2').$('f2');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
So we don’t need to do this
Copyright © 2016 M/Gateway Developments Ltd
$() only needs invoking once
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
var f2Node = myDoc.$d.$e2.$('f2');
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
We can do this instead, provided $() has been
used previously for the specified subscript
Copyright © 2016 M/Gateway Developments Ltd
$ properties are DocumentNodes
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
var f3Value = f3Node.value; // bar3
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
$ properties are DocumentNodes
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
var f3Value = myDoc.$d.$e2.$f3.value; // bar3
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
$ properties are DocumentNodes
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc.$d.$e2.$f3.value = 'New value';
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")="bar3"
Copyright © 2016 M/Gateway Developments Ltd
Persistent JavaScript Objects!
var myDoc = new this.documentStore.DocumentNode('myDoc');
var f3Node = myDoc.$('d').$('e2').$('f3');
myDoc.$d.$e2.$f3.value = 'New value';
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")=”New value"
Updates value on disk, not an in-memory copy
"Persistent JavaScript Objects"
Copyright © 2016 M/Gateway Developments Ltd
Persistent JavaScript Objects
myDoc("a")=123
myDoc("b","c1")="foo"
myDoc("b","c2")="foo2"
myDoc("d","e1","f1")="bar1"
myDoc("d","e1","f2")="bar2"
myDoc("d","e2","f1")="bar1"
myDoc("d","e2","f2")="bar2"
myDoc("d","e2","f3")=”New value"
Not quite: myDoc.d.e2.f3
Instead: myDoc.$d.$e2.$f3
But no chance of subscript-based properties clashing with
DocumentNode property or method names by prefixing with $

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EWD 3 Training Course Part 21: Persistent JavaScript Objects

  • 1. Copyright © 2016 M/Gateway Developments Ltd EWD 3 Training Course Part 21 JavaScript Abstraction of Global Storage: (b) Persistent JavaScript Objects Rob Tweed Director, M/Gateway Developments Ltd Twitter: @rtweed
  • 2. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 3. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); Can we then refer to: myDoc.d.e2.f3 ? myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 4. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 Is a DocumentNode Object myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 5. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" Would also have to be a DocumentNode Object This would mean we'd have to know that the 'd' property was, or could be, a valid node
  • 6. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" Would also have to be a DocumentNode Object
  • 7. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" Would also have to be a DocumentNode Object
  • 8. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 BUT: Impossible to predict or determine in advance all the possible subscripts of a Global myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 9. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 BUT: Impossible to predict or determine in advance all the possible subscripts of a Global •No schema to tell us myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 10. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.d.e2.f3 BUT: Impossible to predict or determine in advance all the possible subscripts of a Global •No schema to tell us •could be hundreds of thousands, or millions of subscript values and any number of levels of hierarchy myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 11. Copyright © 2016 M/Gateway Developments Ltd var myDoc = new this.documentStore.DocumentNode( 'myDoc'); myDoc.x.value Also: can't create properties automatically using subscript names as these might clash with DocumentNode property or method names as in the case above myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" myDoc("x","value")="hello world"
  • 12. Copyright © 2016 M/Gateway Developments Ltd $() Function var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 13. Copyright © 2016 M/Gateway Developments Ltd $() Function var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 14. Copyright © 2016 M/Gateway Developments Ltd $() Function var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" $(): - Returns a DocumentNode Object representing the specified sub-node of the parent DocumentNode
  • 15. Copyright © 2016 M/Gateway Developments Ltd $() Function var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = new this.documentStore.DocumentNode('myDoc', [ 'd']); This does the same thing, but is much more verbose myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 16. Copyright © 2016 M/Gateway Developments Ltd Chaining $() Functions var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 17. Copyright © 2016 M/Gateway Developments Ltd Chaining $() Functions var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); var e2Node = dNode.$('e2'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 18. Copyright © 2016 M/Gateway Developments Ltd Chaining $() Functions var myDoc = new this.documentStore.DocumentNode('myDoc'); var dNode = myDoc.$('d'); var e2Node = myDoc.$('d').$('e2'); Does the same thing by chaining myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 19. Copyright © 2016 M/Gateway Developments Ltd Chaining $() Functions var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 20. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" A DocumentNode represented by $d was instantiated as a property of the myDoc DocumentNode
  • 21. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" A DocumentNode represented by $d was instantiated as a property of the myDoc DocumentNode Now accessible as myDoc.$d
  • 22. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" A DocumentNode represented by $e2 was instantiated as a property of myDoc.$d
  • 23. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" A DocumentNode represented by $e2 was instantiated as a property of myDoc.$d Now accesible as myDoc.$d.$e2
  • 24. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" Only need to use $() once for any specific subscript
  • 25. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); var f2Node = myDoc.$('d').$('e2').$('f2'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" So we don’t need to do this
  • 26. Copyright © 2016 M/Gateway Developments Ltd $() only needs invoking once var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); var f2Node = myDoc.$d.$e2.$('f2'); myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3" We can do this instead, provided $() has been used previously for the specified subscript
  • 27. Copyright © 2016 M/Gateway Developments Ltd $ properties are DocumentNodes var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); var f3Value = f3Node.value; // bar3 myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 28. Copyright © 2016 M/Gateway Developments Ltd $ properties are DocumentNodes var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); var f3Value = myDoc.$d.$e2.$f3.value; // bar3 myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 29. Copyright © 2016 M/Gateway Developments Ltd $ properties are DocumentNodes var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc.$d.$e2.$f3.value = 'New value'; myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")="bar3"
  • 30. Copyright © 2016 M/Gateway Developments Ltd Persistent JavaScript Objects! var myDoc = new this.documentStore.DocumentNode('myDoc'); var f3Node = myDoc.$('d').$('e2').$('f3'); myDoc.$d.$e2.$f3.value = 'New value'; myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")=”New value" Updates value on disk, not an in-memory copy "Persistent JavaScript Objects"
  • 31. Copyright © 2016 M/Gateway Developments Ltd Persistent JavaScript Objects myDoc("a")=123 myDoc("b","c1")="foo" myDoc("b","c2")="foo2" myDoc("d","e1","f1")="bar1" myDoc("d","e1","f2")="bar2" myDoc("d","e2","f1")="bar1" myDoc("d","e2","f2")="bar2" myDoc("d","e2","f3")=”New value" Not quite: myDoc.d.e2.f3 Instead: myDoc.$d.$e2.$f3 But no chance of subscript-based properties clashing with DocumentNode property or method names by prefixing with $