Dijit Calender calling getClassForDate manually

[Michael Helwig-3]

Hi all,

i'm new to the dojo toolkit and I begin to like it since it offers many
useful features. I'm currently trying to get the dijit calendar widget
to mark certain dates (which I retrieve from a database via xhrGet /
PHP). The widget appeared to be nice at first, but causes me some
serious problems since it seems not to be designed for stuff like that.

My most important question is this:
Is there a way to get the widget to re-render the dates by calling
getClassForDate?

Since I have an asynchronous call to the database, the widget is
displayed (and such "getClassForDates" is called) before the answer to
the request arrives. So I would like to trigger the (re-)rendering of
the dates manually as soon as the relevant data is present. How is this
possible?

Another problem that I was facing is that I would like to get an event
when the user switches the date by pressing the "next" or "previous"
arrow buttons on the top of the widget to switch to the next or previous
month, meaning that I would I like to now which month and year is
currently displayed. Is there an event for that? I could not find
anything in the api (or in the source - at least at first glance).
I solved this by also using the getClassForDate function, but it is not
a very nice solution. So is there an easier way?

Thanks in advance,

Michael H.
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[Karl Tiedt]

Well to rerender the calendar is simple, this._populateGrid() to get current displayed month... this.displayMonth

(all gleaned from looking at _adjustDisplay)

note: _Calendar isnt a public class, so its API is subject to change its primarily used to inherit from for larger calendar based things
-Karl Tiedt


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[Adam Peller-2]

On Fri, Nov 6, 2009 at 9:05 AM, Michael Helwig wrote:

i'm new to the dojo toolkit and I begin to like it since it offers many
useful features. I'm currently trying to get the dijit calendar widget
to mark certain dates (which I retrieve from a database via xhrGet /
PHP). The widget appeared to be nice at first, but causes me some
serious problems since it seems not to be designed for stuff like that.

Yup... does not seem to account for asynch at all.  The widget was deliberately kept light and simple, but perhaps there is a way to be more accommodating for asynch without adding much code?
 

My most important question is this:
Is there a way to get the widget to re-render the dates by calling
getClassForDate?

getClassForDate is called by the Calendar code and, as you point out, does not make allowances for asynch callbacks.
 

Since I have an asynchronous call to the database, the widget is
displayed (and such "getClassForDates" is called) before the answer to
the request arrives. So I would like to trigger the (re-)rendering of
the dates manually as soon as the relevant data is present. How is this
possible?

 

As Karl mentioned, you'd probably need to change the rendering logic.  Simply calling _populateGrid at the right time to repopulate might also be an option, but it would likely result in some multiple rendering and jumping around, so you might find yourself subclassing and inserting some logic.  Karl's right to point out that _populateGrid is a private method -- no guarantees on API stability.  Calendar itself, however, is being promoted from _Calendar in the 1.4 release.

Another problem that I was facing is that I would like to get an event
when the user switches the date by pressing the "next" or "previous"
arrow buttons on the top of the widget to switch to the next or previous
month, meaning that I would I like to now which month and year is
currently displayed. Is there an event for that? I could not find
anything in the api (or in the source - at least at first glance).
I solved this by also using the getClassForDate function, but it is not
a very nice solution. So is there an easier way?

 There's only an event when the selection actually changes, not when the user scrolls to a different month/year, and unfortunately there are many codepaths to get there.  You could try doing a dojo.connect to _populateGrid.  I think that's the only thing that the codepaths have in common, and it would be called less frequently than getClassForDate.

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[Michael Helwig-3]

Hi, thanks to both of you. This information is very helpful, I will
experiment with the widget a bit.

Greetings,

Michael

Adam Peller schrieb:

> On Fri, Nov 6, 2009 at 9:05 AM, Michael Helwig wrote:
>
>     i'm new to the dojo toolkit and I begin to like it since it offers
>     many
>     useful features. I'm currently trying to get the dijit calendar widget
>     to mark certain dates (which I retrieve from a database via xhrGet /
>     PHP). The widget appeared to be nice at first, but causes me some
>     serious problems since it seems not to be designed for stuff like
>     that.
>
>
> Yup... does not seem to account for asynch at all.  The widget was
> deliberately kept light and simple, but perhaps there is a way to be
> more accommodating for asynch without adding much code?
>  
>
>     My most important question is this:
>     Is there a way to get the widget to re-render the dates by calling
>     getClassForDate?
>
>
> getClassForDate is called by the Calendar code and, as you point out,
> does not make allowances for asynch callbacks.
>  
>
>     Since I have an asynchronous call to the database, the widget is
>     displayed (and such "getClassForDates" is called) before the answer to
>     the request arrives. So I would like to trigger the (re-)rendering of
>     the dates manually as soon as the relevant data is present. How is
>     this
>     possible?
>
>  
> As Karl mentioned, you'd probably need to change the rendering logic.  
> Simply calling _populateGrid at the right time to repopulate might
> also be an option, but it would likely result in some multiple
> rendering and jumping around, so you might find yourself subclassing
> and inserting some logic.  Karl's right to point out that
> _populateGrid is a private method -- no guarantees on API stability.  
> Calendar itself, however, is being promoted from _Calendar in the 1.4
> release.
>
>     Another problem that I was facing is that I would like to get an event
>     when the user switches the date by pressing the "next" or "previous"
>     arrow buttons on the top of the widget to switch to the next or
>     previous
>     month, meaning that I would I like to now which month and year is
>     currently displayed. Is there an event for that? I could not find
>     anything in the api (or in the source - at least at first glance).
>     I solved this by also using the getClassForDate function, but it
>     is not
>     a very nice solution. So is there an easier way?
>
>
>  There's only an event when the selection actually changes, not when
> the user scrolls to a different month/year, and unfortunately there
> are many codepaths to get there.  You could try doing a dojo.connect
> to _populateGrid.  I think that's the only thing that the codepaths
> have in common, and it would be called less frequently than
> getClassForDate.
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> FAQ: http://dojotoolkit.org/support/faq
> Book: http://docs.dojocampus.org
> Dojo-interest@...
> http://mail.dojotoolkit.org/mailman/listinfo/dojo-interest
>  

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