I am trying to draw a text glyph on the map and all the tutorials say I need a IDynamicDisplay, but I don't know how to get at one. Thanks in advance. ; )
edit: C# VS2010
First you need to set IDynamicMap::DynamicMapEnabled property from Map object to true.
IDynamicMap pDynamicMap = pMap as IDynamicMap;
pDynamicMap.DynamicMapEnabled = true
Then, there are two ways to get DynamicDisplay object. One is creating custom Layer with implement IDynamicLayer interface. Second one is hooking IDynamicMapEvents::BeforeDynamicDraw event or IDynamicMapEvents::AfterDynamicDraw event. I hope this best practice help you.
Best practices for using dynamic display
You have to wire up an event handler
ESRI.ArcGIS.Carto.IDynamicMapEvents_Event dynamicMapEvents = dynamicMap as ESRI.ArcGIS.Carto.IDynamicMapEvents_Event;
ESRI.ArcGIS.Carto.IActiveViewEvents_Event avEvents = activeView as ESRI.ArcGIS.Carto.IActiveViewEvents_Event;
avEvents.AfterDraw += new ESRI.ArcGIS.Carto.IActiveViewEvents_AfterDrawEventHandler(avEvents_AfterDraw);
dynamicMapEvents.AfterDynamicDraw += new IDynamicMapEvents_AfterDynamicDrawEventHandler(dynamicMapEvents_AfterDynamicDraw);
Related
I am very new to syncfusion controls for mvc. While exploring how to set dynamic datasource to grid, I came across this line of javascript code which I cannot understand. I have been through the javascript api docs for ej grid but couldn't find the meaning.
var obj = $("#Grid").ejGrid("instance");
If someone can explain the meaning and point out some reference documentation, I will be highly grateful.
The example I came across
https://help.syncfusion.com/aspnetmvc/grid/how-to
The javascript api I have been through
https://help.syncfusion.com/api/js/ejgrid#members:datasource
P.s: I know from a comment I came across that this has something to do with current instance of ej grid but I would like a solid understanding via a reference so I can understand.
From my little experience with Syncfusion controls the documentation explaining how to perform tasks is not well stated. If you have a license you can ask questions in their forum but I can tell you what little I learned perusing their forum.
In their JS 1 version
var obj = $("#Grid").ejGrid("instance");
and in their JS 2 version
var obj = document.getElementById('Grid').ej2_instances[0];
The variable obj appears to get an object reference to the grid identified by the id Grid. I am not sure what the instance value refers to other than the examples in the documentation show it and it works when it is used.
Not sure if I was much help.
In the Below code example Grid – Grid ID and you can take the Grid instance using the above code example. From the instance you can get the details regarding the column, dataSource, filterSettings, sortSettings etc currently applied to ejGrid. We have given support to customize the Grid using several public method. You can call those method by taking the Grid instance.
#(Html.EJ().Grid<EJGrid.Models.Order>("Grid")
.Datasource((IEnumerable<object>)ViewBag.datasource)
.AllowPaging()
.Columns(col =>
{ col.Field("OrderID").HeaderText("Order ID").TextAlign(TextAlign.Right).Width(75).Add();
col.Field("EmployeeID").HeaderText("Employee ID").TextAlign(TextAlign.Right).Width(90).Add();
col.Field("Freight").HeaderText("Freight").Format("{0:c}").TextAlign(TextAlign.Right).Width(90).Add();
col.Field("ShipCity").HeaderText("Ship City").Width(90).Add();
col.Field("Child.Test").HeaderText("TEst").Format("{0:c}").Width(90).Add();
col.Field("ShipCountry").HeaderText("Ship Country").Width(90).Add();
})
)
<script>
var obj = $("#Grid").ejGrid("instance");
var value = $("#colValue").val();
//Add custom parameter to the server
var query = new ej.Query().addParams("EmployeeID", value);
//Creating ejDataManager with UrlAdaptor
var dataManager = ej.DataManager({ url: "/Home/GetData", adaptor: new ej.UrlAdaptor() });
var promise = dataManager.executeQuery(query); promise.done(function (e) {
//Assign the result to the grid dataSource using "dataSource" method.
obj.dataSource(e.result);
</script>
To update the Grid, you can use dataSource() method. To call that method you need to take the Grid instance and call that method.
Refer the below API documentation for your reference
https://help.syncfusion.com/api/js/ejgrid#methods:datasource - used to update the Grid dataSource dynamically
https://help.syncfusion.com/api/js/ejgrid#members:datasource - returns the Grid dataSource.
Please get back to us if you have further queries.
I am using Xamarin Forms and their templates come with MvvMHelpers object to be used in the ViewModel as ObservableRangeCollections. I know ObservableCollections. If you try to do :
ObservableRangeCollection<Object> collection = new ObservableRangeCollection<Object>();
List<Object> objects = new List<Objects>();
collection.ReplaceRange(objects);
//error invalid type
Does anyone know how to use an ObservableRangeCollection? There is nothing on it in Google, Bing or StackOverflow.
Try the search you'll see Xamarin is promoting something so new that nobody knows what it is.
ObservableRangeCollection is a helper class by the Xamarin Evangelist James Montemagno.
The source is available in his github:
https://github.com/jamesmontemagno/mvvm-helpers
ObservableRangeCollection intends to help when adding/replacing Collections to a ObservableCollection.
In a "regular" ObservableCollection, for each new item added to the Collection, a OnCollectionChanged event would raise.
This is where ObservableRangeCollection gets in. It allows to replace/add elements to the Collection without firing an event for each element.
ObservableRangeCollection is subclassed from ObservableCollection.
So in your example, substitute your <T>, i.e:
ObservableRangeCollection<string> collection = new ObservableRangeCollection<string>();
List<string> objects = new List<string>();
collection.ReplaceRange(objects);
Consult the code here: https://github.com/jamesmontemagno/mvvm-helpers/blob/master/MvvmHelpers/ObservableRangeCollection.cs
This is not something that new. There's plenty of code using ObservableCollection.
What you are trying to achieve can be done like this:
List<Object> myList = new List<Objects>();
ObservableCollection<Object> myCollection = new ObservableCollection<Object>(myList);
Read more about ObservableCollection.
Check out my answer here, which is an enhanced version of ObservableRangeCollection optimized for less event raising and reuse of items in UI.
I am unable to fire an "onchange" event in mshtml. Can you please tell me what I am doing wrong here.
HTMLSelectElement element = (HTMLSelectElement)this.HTMLDocument.all.item(controlId, 0);
IHTMLElement e = element as IHTMLElement;
IHTMLDocument4 doc = e.document as IHTMLDocument4;
object dummy = null;
object eventObj = doc.CreateEventObject(ref dummy);
HTMLSelectElementClass se = element as HTMLSelectElementClass;
se.FireEvent("onchange", ref eventObj);
I am getting variable "se" as null. I got this piece of code from another link http://www.itwriting.com/phorum/read.php?3,1507
Can anyone help me with this.
Thanks,
Sam
Runtime Callable Wrapper objects generated by COM calls like HTMLDocument.all.item can translate interface casting to QueryInterface calls. But the RCW does not know how to convert to a managed class like HTMLSelectElementClass, thus it returns null.
Instead of casting to HTMLSelectElementClass, cast to IHTMLElement3 to call fireEvent.
By the way, your code does not work in IE11 mode as document.all is deprecated. Use IHTMLDocument3::getElementById instead.
I had tried all those which Sheng mentioned but didn't work.
This issue was solved by injecting javascript code for "onchange" and executing it. It worked.
I am using Tastypie, Django for my project.
To Update a many to many field I have used save_m2m hook.
def save_m2m(self, bundle):
for field_name, field_object in self.fields.items():
if not getattr(field_object, 'is_m2m', False):
continue
if not field_object.attribute:
continue
if field_object.readonly:
continue
related_mngr = getattr(bundle.obj, field_object.attribute)
related_objs = []
print bundle.data[field_name]
for related_bundle in bundle.data[field_name]:
try:
stock = Stock.objects.get(nse_symbol = related_bundle.obj.nse_symbol)
print stock.__dict__
except Stock.DoesNotExist as e:
dataa = {"error_message": e}
raise ImmediateHttpResponse(response=HttpBadRequest(content=json.dumps(dataa), content_type="application/json; charset=UTF-8"))
related_objs.append(stock)
related_mngr.add(*related_objs)
Now I want to remove elements from the same many to many field.
How should I achieve this. Do I have to send a patch request or delete request and how to handle this.
I am begineer in tastypie. I googled it some time and I couldn't find a proper way. Please guide me how to complete this.
Thanks.
I've thought a lot about handing m2m relationships, since most of our app depends on m2m links.
I've settled for the approach of an update method. Pass in the all the references of the relationships you want changed (add and remove), then update the db accordingly. We only pass in the changed values, since if you have a paginated list, you only want to update the items the user has identified. Generally I use a custom hook for this defined in override_urls.
I used to have a separate add and remove method, which worked well until we changed the gui and allowed users simply to change checkboxes. In that approach having an update method was much more useful. You'll have to decide on which method suits your application the best.
ormlite-android-4.29, ormlite-core-4.29
I have a ForiegnCollection of PantryCheckLine objects like this in my PantryCheck class.
#ForeignCollectionField(eager = true, maxEagerForeignCollectionLevel = 1)
private ForeignCollection<PantryCheckLine> pantryCheckLines;
Let's say I had 3 PantryCheckLines objects and I deleted one. Then I want to delete the PantryCheck with combined PantryCheckLines of it. Everything seems working. But the size of the ForiegnCollectionis not correct.
deleting method as follows.
PantryCheckLineRepo pantryCheckLineRepo =
new PantryCheckLineRepo(DaoFactory.getPantryCheckLineDaoInstance());
Collection<PantryCheckLine> pantryCheckLinesCollection =
this.getPantryCheckLines();
Log.v("pantrychecklines size", pantryCheckLinesCollection.size());
pantryCheckLineRepo.delete(pantryCheckLinesCollection);
Log.v("pantrychecklines", "deleted");
appreciate your help.
I can't answer specifically because I'm not sure what the delete() method is doing. If you edit your question with more details about what Dao calls or ForeignCollection calls are being made, I can add details here.
The only way the collection size would be affected is if you used the remove(Object) method on the collection itself. If you used the Dao to delete the item behind the scenes then the collection would not know that the delete happened and its eager fetched internal list size would not be affected. The lazy collections (eager = false) always go to the database so either remove(Object) or dao.delete(Object) would work.
Hope this helps.