I have an Object that handles all of my page events, I decided to go that
way instead of just writing a bunch of functions to help save on GC. I am
having a bit of a problem though, it seems that when an event listener is
fired there is no way to set scope. So, I have my Object "PageHandler"
inside of it there is a function "pageChange", that is to be called
whenever the visualization table gets its page changed, so I can re-setup
actions on the items in the table. Everything was seemingly working fine
until I needed to switch the page from just using a Table type of chart, to
using a Dashboard, so that my users could search the table. Now that I have
it setup as a Dashboard, I have my "ready" event setup to run a function
that attaches the rest of the event functions on the table itself, since
you can't access a Wrappers chart until after the dashboard ready event.
That is just written as a standalone function, inside of which I
instantiate my new Object and attach the page event, like so...
function setup() {
page = new PageHandler();
google.visualization.events.addListener(page.getChart(), 'page',
page.pageChange);
}
That is an extremely simplistic version of the function, but you get the
idea. The problem comes in pageChange, there is no scope. Here is a
very...very simple snippet that will represent this...
var PageHandler = function() { }
PageHandler.prototype = {
getChart: function() {
return dash.dashboardParts.mainTable.getChart();
},
pageChange: function() {
console.log(this);
}
}
now dash is my object, and dashboardParts.mainTable is new
google.visualization.ChartWrapper({...}); so I am using getChart on it to
get the underlying table chart. The problem is, inside pageChange when I
console.log(this); it is logging undefined.
Is there any possible way to allow for proper scoping of the functions
getting run when the event handler is called? I have had to do some pretty
terrible workarounds that I really do not want to ever have in a production
environment, but I have to have scope somehow. Any help would be greatly
appreciated. Thank you.
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