What does dijit.registry.remove() do? How does it handle invalid parameters?
The dijit.registry reference is an instance of dijit.WidgetSet, which is a collection of widgets.
The remove() function accepts an input ID and removes that Widget with the corresponding ID from the collection, if found.
In Dojo 1.4, WidgetSet is defined within dijit/_base/manager.js.
The passed ID is used internally as the key looked in an associative array. It's used like: this._hash[id], so passing it garbage will result in nothing being found or removed.
Related
I have an ArrayList of LongArrays, each of size 2. I am trying to use the built-in 'indexOf' method to find the index of a specific array of longs, and I can't figure out why the code says the array of longs I'm searching for isn't found. See the below screen shot of a debugging session where try to evaluate finding 'longArrayOf(0L,5L)' in the ArrayList. In my mind, longArrayOf(0L,5L) is clearly the first element in the cardHierarchy array. Can the 'indexOf' function not be used for finding arrays? Can anyone suggest an alternate method?
indexOf uses Object.equals() when you pass arrays, which compares by reference address which is different for the LongArray passed to indexOf and the one present in cardHierarchy.
Change it to
cardHierarchy.indexOfFirst { it.contentEquals(longArrayOf(0L, 5L)) }
I am trying to assign the value of this stucture path to a fieldsymbol, but this path does not work because it has a table in it's path.
But with in the debugger this value of this path is shown correctly.
Is there a way to dynamically assign a component of a table line to a fieldsymbol, by passing one path?
If not then I will just read the table line and then use the path to get the wanted value.
ls_struct (Struct)
- SUPPLYCHAINTRADETRANSACTION (Struct)
- INCL_SUPP_CHAIN_ITEM (Table)
- ASSOCIATEDDOCUMENTLINEDOCUMENT (Element)
i_component_path = |IG_DDIC-SUPPLYCHAINTRADETRANSACTION-INCL_SUPP_CHAIN_ITEM[1]-ASSOCIATEDDOCUMENTLINEDOCUMENT|.
ASSIGN (i_component_path) TO FIELD-SYMBOL(<lg_value>).
IF <lg_value> IS NOT ASSIGNED.
return.
ENDIF.
<lg_value> won't be assigned
Solution by Sandra Rossi
The debugger has its own syntax and own logic, it doesn't apply the ASSIGN algorithm at all. With ABAP source code, you have to use ASSIGN twice, the first one to reach the internal table, then you select the first line, and the second one to reach the component of the line.
The debugger works completely differently, the debugger code works only in debug mode, you can't call the code from the debugger (i.e. if you call it, the kernel code used by the debugger will fail). No, there's no "abappath". There are the XSL transformation objects (xpath), but it's slow for what you ask.
Thank you very much
This seems to be a rather unexpected limitation of the ASSIGN statement. Probably worth a ticket to SAP's ABAP language group to clarify whether it's even a bug.
While this works:
ASSIGN data-some_table[ 1 ]-some_field TO FIELD-SYMBOL(<lv_source>).
the same expressed as a string doesn't:
ASSIGN (`data-some_table[ 1 ]-some_field`) TO FIELD-SYMBOL(<lv_source>).
Alternative 1 for (name) of the ABAP keyword documentation for the ASSIGN statement says that "[t]he name in name is structured in the same way as if specified directly".
However, this declaration is immediately followed by "the content of name must be the name of a data object which may contain offsets and lengths, structure component selectors, and component selectors for assigning structured data objects and attributes in classes or objects", a list that does not include the table expressions we would need here.
I've used dictionaries (Whether they were called that or not) in a number of other languages, but there's always been a method that can be called with on parameter that either:
A) Returns the associated value if the parameter is in use as a key, or
B) Indicates in some way that the parameter is not used as a key
I've been forced into a position where I have to learn excel/VBA and used the collections class for all of about five minutes before the lack of an .exists method led me to look for something else. The general consensus seems to be that the scripting.Dictionary class is the VBA equivalent of associative arrays/dictionaries/hashtables in other languages.
The one thing I don't like the look of though is that the only way I can see of retrieving the value associated with a given key is to use the .items property (either explicitly, or via scripting.Dictionary("key")). But rather than doing anything to indicate the issue if key is not in use in the dictionary, it adds it.
I know I can use a if structure with .exists being the test to achieve the same functionality, and can write my own function that raises an error if the exists test fails, but it seems a lot of stuffing around to achieve what is core functionality in Python (raises KeyError), PHP (raises a Notice), Java (Maps return null - although that is not necessarily ideal in the case of HashMaps where null actually is a valid value - but it does work as an indicator for HashTables).
So is there any way of attempting to retrieve a value by key that will do something (ideally throw an error) if the key is not in use, rather than silently adding it? Google hasn't provided any answers - but maybe I'm just not phrasing the search well.
I find it inconvenient too that Dictionary adds the key when you access a non-existing key.
Just use Collection and write the missing Exist function yourself, e.g.
Function ExistsInCollection(ByVal c As Collection, ByVal key As Variant) As Boolean
On Error GoTo not_exists
c.Item key
ExistsInCollection = True
not_exists:
End Function
What is the operator or function to test whether two variables of the same custom object type refer to the same object? I've tried
If myObject = yourObject Then
But get a runtime error 438 object doesn't support this property or method. I'm guessing that's telling me to override the '=' operator to test if all the fields of the two objects have the same value. But what I want is to test whether they are the same object.
I'm guessing that's telling me to override the '=' operator to test if all the fields of the two objects have the same value.
No, it tells you the objects don't have a default property which would have been called otherwise, and the returned results compared.
You test reference equality with Is
If myObject Is yourObject Then
You need to serialize the objects somehow and then compare attribute by attribute values. The "is" operator is as dumb as it gets, it only matches if another object is the same instance assigned to the compared variable.
I suggest using a jsonStringify library. I adapted one for my DexTools.xlam open source project https://github.com/dexterial/Dextools/tree/master/Main starting from the Parsing JSON in Excel VBA post. It has much more added features since I added quite a few other excel objects serialization/hashing options and it is made using the vba test driven development that DexTools incorporates. It is still work in progress so dont expect miracles
Is there a way I can get a attribute set in ServletContext in EL so that it ends up as a JavaScript variable?
I am setting it as
context.setAttribute("testing.port", "9000");
I tried retrieving it like
alert("port" +'${testing.port}');
I am just getting a blank.
The problem is the period (.) in the key name. EL interprets the period as a call to an accessor method named getPort1 on whatever object testing references. Fetch the value from the appropriate implicit object:
${applicationScope['testing.port']}
or just use a different key:
${testingPort}
1Yes, this is a simplification of what really happens. It may also look for a predicate getter named isPort, or try Map#get("port").