Is there a way for me to incorporate an "onload" function into my personalized Dojo class which can trigger functions that are registered to listen for the event? Perhaps something like myWidget.addOnLoad(...)
My class doesn't belong to Dijit, it's a basic class that uses dojo.declare. When instantiated, various functions (xhr, etc) are called to set up the class and I wish to have the capability to inform other JavaScript functions that the widget has been loaded and is ready.
Have you thought about utilizing the dojo.publish() method to emit a message when the widget is fully prepared? Alternatively, if the other part of the code can access the widget, you could create an empty function within the widget called "loaded" and then the other code could establish a connection using dojo.connect to be notified when this "loaded" function is triggered.
According to the findings of jburke, Dojo simplifies the process for you: all you need is dojo.connect. Here's a demonstration:
x = {
loaded: function() { console.log('[x] loaded'); }
}
y = {
dependentAction: function() { console.log('[y] dependentAction'); }
}
dojo.connect( x, 'loaded', y, 'dependentAction' );
x.loaded()
// displays:
// [x] loaded
// [y] dependentAction
Simply call x.loaded() after completing the loading of x.
After studying the Dojo addOnLoad functions, I decided to incorporate them into my class. To me, this approach seemed to be the most effective and straightforward. While considering using a pub/sub or dojo.connect method, I believe that this implementation stands out as the cleanest and most intuitive solution.
Here are the key components that I extracted from dojo.js and integrated into my class:
_addToQueue : function(array, object, functionToAdd){
if(!functionToAdd){
array.push(object);
}else if(functionToAdd){
var callback = (typeof functionToAdd == "string") ? object[functionToAdd] : functionToAdd;
array.push(function(){ callback.call(object); });
}
},
_loadComplete : function() {
this._notifyLoading = true;
this._afterLoad = true;
var loadersList = this._loaders;
for(var i = 0; i < loadersList.length; i++){
try{
loadersList[i]();
}catch(error){
throw error;
console.error("addOnLoad callback failed: " + error, error); /* continue with other load events, like the parser, but report the error */
}
}
this._notifyLoading = false;
//Ensure that no additional callbacks were added to the onload queue
//after the initial run. If any were added and there are no more waiting resources,
//rerun the function.
if(this._afterLoad && this._pendingResources == 0 && loadersList.length){
this._loadComplete();
}
},
addOnLoad : function(/*Object?*/object, /*String|Function?*/functionName){
this._addToQueue(this._loaders, object, functionName);
if(this._afterLoad && !this._notifyLoading){
this._loadComplete();
}
}
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