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HowTo: Component attribute of type Map
I am struggling to pass down a map to a component. The following...
<apex:attribute name="dict" type="map" description="descr" required="true"/>
... does not work as type map does not seem supported. So, I have set out to define my own apex class...
//simple wrapper for a custom map class
global with sharing class MyDict{
global MyDict(){}
private Map<String,String> dictionary = new Map<String,String>();
public String get(String entry){
return this.dictionary.get(entry);
}
public Void put(String entry, String translation){
this.dictionary.put(entry,translation);
}
public map<String,String> getDict(){
return this.dictionary;
}
}
Well... so far so good, I can create, populate and retrieve an instance of MyDict in my page controller like this...
//create dict instance
private MyDict dict = new MyDict();
//populate dict
List<Dict__c> dic = Dict__c.getall().values();
for (Dict__c d : dic) {
this.dict.put(d.name,String.ValueOf(d.get(this.lang+'__c')));
}
//return dict
public SettingsDict getDict() {
return this.dict;
}
Well, however, I fail to retrieve a corresponding value of said map in my Component...
<apex:component controller="SubmitCaseController" allowDML="true">
<apex:attribute name="dict" type="MyDict" description="the dictionary" required="true"/>
<h1>{!dict.get('someEntry')}</h1>
</apex:component>
How am I to access the data in the underlying map from within a Component? Or, how else could I hand down a map from a controller to a page to a component being called form within that page?
Cheers, Tobias.
You can't pass a parameter to a function. There is support for setting some information into a controller prior to executing an action method via the apex:param component, but that's not really using method parameters.
You should be able to access the value from a map based on the key though. Having just re-read the code that I posted, that's not quite dynamic binding map syntax. Try:
<h1>{!dict.dict['someEntry']}</h1>All Answers
When you say that you fail to retrieve the data in the component, do you get an error or is it just an empty?
I don't think this line:
<h1>{!dict.get('someEntry')}</h1>will work, as that is using the Map dynamic binding syntax, but your class isn't a map, its a custom class that happens to have a get that works like a Map.
What happens if you access the underlying map, e.g.
<h1>{!dict.dict.get('someEntry')}</h1>In both cases, exactly the same thing happens, which is...
Error: Unknown function dict.get. Check spelling.
or in your case...
Error: Unknown function dict.dict.get. Check spelling.
You can't pass a parameter to a function. There is support for setting some information into a controller prior to executing an action method via the apex:param component, but that's not really using method parameters.
You should be able to access the value from a map based on the key though. Having just re-read the code that I posted, that's not quite dynamic binding map syntax. Try:
<h1>{!dict.dict['someEntry']}</h1><h1>{!dict.dict['someEntry']}</h1>Thanks a lot, that worked!
You may be able to pass a map into a component directly by just specifying the type as 'Object", which is accepted. I haven't verified if it actually works, however.
I'll create a work item to support type='map', but that will likely be a low priority.