On May 17, 2013, at 07:45, Are wrote:
> I am currently using mongoose, node.js , express. I need to fill up multiple
> drop down menus from MongoDB.
> This calls the index (in app.js), which returns 1 collection.. but only the
> one:
> app.get('/', activityList.showActivities.bind(activityList));
This line doesn't *call* anything; it *defines* that *when* a user requests "/"
from your server, the server will invoke a request handler function called
activityList.showActivities.
> activitylist.js
> ActivityList.prototype = {
> showActivities: function(req, res) {
> point.find({}, function foundPoints(err, items) {
> res.render('index2',{title: 'CapCredits' , points: items})
> });
> },
When activityList.showActivities is invoked, it uses mongoose to find all data
in the "point" collection, and when the results are received, calls
res.render() to fill the indicated Jade template with the supplied variables
and sends the resulting HTML to the browser.
> and in my index.jade:
>
> form(action="/asdad", method="post")
> select(name = "item[activity]")
> each activity in activities
> option(value='Test') #{activity.activityName}
The res.render() invocation above uses the template "index2" not "index". And
here you're iterating over a variable called "activities", which your
res.render() invocation did not supply; you supplied a variable called
"points", so that's what you would be iterating over in the template.
> How can I do this for several collections? I have two collections which I
> want to fill two drop down menus with.
Instead of just calling find() on the point collection, you'll also call find
on additional collections. Here's an example of finding all points and all
balloons:
showActivities: function(req, res) {
point.find({}, function foundPoints(err, points) {
balloon.find({}, function foundBalloons(err, balloons) {
res.render('index2',{title: 'CapCredits' , points: points, balloons:
balloons})
});
});
},
Note that this is *not* the best way to do it, because a) we find points, and
then when that's done, we find balloons (in serial) whereas it would be more
efficient to begin trying to find both points and balloons at the same time (in
parallel); and b) the ever-increasing indentation is ugly and harder to follow.
This is a common problem in nodejs for which there are an unlimited number of
npm modules that can help you structure your code better. "async" is a very
popular module for this.
> Is there any way I can use rest-calls like:
> app.get('/otherMenu', activityList.showActivities.bind(activityList));
That line would define that when a user requests "/otherMenu" from your server,
the server would invoke the same activityList.showActivities function you've
defined above. That's probably not useful.
I don't see how REST enters into what you're trying to do at all. The term
"REST" is often used when talking about web services, but what you've described
above is not a web service; it's a web server producing a normal HTML web site.
Users will make one HTTP request to your server (for "/" for example) and will
receive a formatted HTML response containing all sorts of information from
various database collections that your server has assembled.
If you want a web service, and want, for example, that "/otherMenu" returns
*just* the items of some database collection, perhaps in JSON format that
you'll access via AJAX and turn into DOM elements on the fly in some
client-side JavaScript, you can do that, but that's not what you were talking
about above.
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