This is code of @"John Snyders-Oracle" for subscribing to the model. There are things I do not understand about it and I have been surfing the web for a long time for this. I'd appreciate if you can help me understand it.
// create a private scope where $ is set to apex.jQuery
(function($) {
// This is the function that calculates over all the rows of the model and then
// updates something else.
// Change this to do whatever calculation is needed.
// Call this whenever the model data changes.
function update(model) {
var salKey = model.getFieldKey("SAL"),
total = 0;
console.log(">> starting sum SAL column")
model.forEach(function(record, index, id) {
var sal = parseFloat(record[salKey]), // record[salKey] should be a little faster than using model.getValue in a loop
meta = model.getRecordMetadata(id);
if (!isNaN(sal) && !meta.deleted && !meta.agg) {
total += sal;
}
});
console.log(">> setting sum SAL column to " + total)
$s("P5_TOTAL", total);
}
//
// This is the general pattern for subscribing to model notifications
//
// need to do this here rather than in Execute when Page Loads so that the handler
// is setup BEFORE the IG is initialized otherwise miss the first model created event
$(function() {
// the model gets released and created at various times such as when the report changes
// listen for model created events so that we can subscribe to model notifications
$("#emp").on("interactivegridviewmodelcreate", function(event, ui) {
var sid,
model = ui.model;
// note this is only done for the grid veiw. It could be done for
// other views if desired. The imporant thing to realize is that each
// view has its own model
if ( ui.viewId === "grid" ) {
sid = model.subscribe( {
onChange: function(type, change) {
console.log(">> model changed ", type, change);
if ( type === "set" ) {
// don't bother to recalculate if other columns change
if (change.field === "SAL" ) {
update( model );
}
} else if (type !== "move" && type !== "metaChange") {
// any other change except for move and metaChange affect the calculation
update( model );
}
},
progressView: $("#P5_TOTAL") // this will cause a spinner on this field
} );
// if not lazy loaded there is no notification for initial data so update
update( model );
// just in case fetch all the data. Model notifications will
// cause calls to update so nothing to do in the callback function.
// can remove if data will always be less than 50 records
model.fetchAll(function() {});
}
});
});
})(apex.jQuery);
1- in line one, What does he mean with "creating private scope"? I know what a private scope mean but I do not understand it here.
2- line 37, (event, ui). Are there Parameter or Arguments(Values)? as far as I'm aware, in the following example,
3- line 47, (type, change). Are they Out Parameters too?