It appears you could simply use a function wrapper around your
page.pageChange function, like this:
google.visualization.events.addListener(page.getChart(), 'page', function()
{
page.pageChange();
});
On Mon, Nov 7, 2016 at 11:55 AM, Robert Mason <[email protected]> wrote:
> 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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--
Daniel LaLiberte <https://plus.google.com/100631381223468223275?prsrc=2>
[email protected] <[email protected]> 5CC, Cambridge MA
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