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Version 8.1 by smmccraw on 2007/07/08 09:45
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1 == Overview ==
2
3 OGNL stands for "Object Graph Navigation Language", and it defines an entire family of key-value coding-like abilities. As Jonathan Rentzsch put it in his CAWUG presentation on Project WOnder, "Think: Key-Value Coding on Steroids". You can get more information on the specifics on OGNL at [[the official OGNL website>>http://www.ognl.org]].
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5 WOOgnl provides a framework that integrates the OGNL syntax into WO's standard binding resolution. By simply including the WOOgnl framework on your build path and preceding your binding value with a ",,", it will be interpreted by WOOgnl.,,
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7 Here are some examples that demonstrate just a tiny bit of the really cool things you can do:
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9 * value=",,Hello Mr. + session.user.firstName";,,
10 * value=",,name.length().(#this>100?2**#this:20+#this)";**,,
11 * value=",,#A=new NSMutableArray(),#A.addObject(name),#A";,,
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13 Here are some examples provided by Max Muller, WOOgnl's original author:
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15 {{panel}}
16
17 // Calling methods with arguments
18 Repetition1: WORepetition {
19 item = arrayItem;
20 list = "~sort(anArray, \"name\")";
21 }
22
23 {{/panel}}
24
25 ~/~/ Calling static methods
26
27 {{panel}}
28
29 Repetition2: WORepetition {
30 item = arrayItem;
31 list = "~@er.extensions.ERXArrayUtilities@sortedArraySortedWithKey(anArray, \"name\")";
32 }
33
34 {{/panel}}
35
36 ~/~/ Accessing static ivars
37
38 {{panel}}
39
40 String1: WOString {
41 value = "~@ognl.webobjects.WOOgnl@OgnlSpecialCharacters";
42 }
43
44 {{/panel}}
45
46 ~/~/ Use of conditionals, note that every previous value of the . is
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48 {{panel}}
49
50 // pushed into the ivar #this
51 String2: WOString {
52 value = "~name.length().(#this > 100? 2*#this : 20+#this)";
53 }
54
55 {{/panel}}
56
57 ~/~/ String concat
58
59 {{panel}}
60
61 String3: WOString {
62 value = "~\"Hello Max \" + name";
63 }
64
65 {{/panel}}
66
67 ~/~/ Use of set operator in. can also use in against NSArray and
68
69 {{panel}}
70
71 NSSet objects
72 String4: WOString {
73 value = "~name in {\"Main\", \"Something\"} ? \"Yes\" : \"No\"";
74 }
75
76 {{/panel}}
77
78 ~/~/ Variable declaration. Note that commas allow multiple actions
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80 {{panel}}
81
82 // per expression.
83 String5: WOString {
84 value = "~#A=new com.webobjects.foundation.NSMutableArray(),#A.addObject(name), #A.addObjectsFromArray(session.languages), #A";
85 }
86
87 {{/panel}}
88
89 Category:WebObjects