I was going through these pages on ZK documentation ID_Space -Selector and looked at following code
comp.query("#ok"); //look for a component whose ID's ok in the same ID space
comp.query("window #ok");
comp.queryAll("window button");
I am wondering how can I use this in my code? I am creating 2 drop downs and adding Id to both these drop downs
Listbox listbox=createListbox(widget, DetailsListRenderer.ORDERSTATUS.class, null,orderStatus);
listbox.setId(ORDER_STATUS_ID);
So when My page is getting refreshed, I am getting exception of Unique Id, I was wondering if these is a way I can query component and see if same component with same Id already exists and in case it exists, I should not add ID to that component, or should not create component at all
Any suggestion?
I tried something like
widget.getFellow( ORDER_STATUS_ID); but getting `org.zkoss.zk.ui.ComponentNotFoundException` exception.
widget.getFellow("#" + ORDER_STATUS_ID);
For widgets that co-exist in the same ID space (a.k.a fellow widgets), one may use any of the following to refernece a fellow from a certain widget:
var fellow = widget.$f('fellowID');
var fellow = widget.$f().fellowID;
var fellow = zk.Widget.$(jq('$fellowID')[0]);
Related
I am extremely new to Flutter, so please forgive my ignorance and please explain things to me like I am a toddler.
I would like to implement a to-do list into my app similar to this project: https://github.com/ishrath-raji/todoey-flutter
It's just a basic list where users can add items, cross them out, and delete them. Very simple.
However, I have absolutely no idea how to take the items that users enter into the to-do list and store them in memory so that the user can review them later.
I've tried googling around, but all the answers I've seen are above my understanding and/or written in a way that is difficult to follow.
Any help would be very much appreciated!
I assume you have a view / page, where the user can give all the necessary information for the new ToDo item. This means you have a class representing a ToDoItem.
class ToDoItem {}
You will want to store them in some List.
As you probably want this list of ToDo items to be accessbible everywhere within the map, you should start researching the topic "state management".
As a starting point, just to name the easiest of all solutions, you could use Riverpod and declare one global variable:
final todoListRereference = StateProvider<List<ToDoItem>>((ref) => <ToDoItem>[]);
Now you have a list of ToDoItem which is accessible from everywhere in your app, provided you follow the steps to make Riverpod providers accessible everywhere. For example, in every build method you can use
final todoList = ref.watch(todoListRereference);
and you have access to all the stored ToDoItems.
In the case of your ToDoItem you can create with all the user information, you will have a construction like:
onPressed: () {
final todoItem = ToDoItem(...);
final todoListProvider = ref.read(todoListReference.notifier);
todoListProvider.state = [... todoListProvider.state, todoItem);
}
I just assumed it would happen after the user clicked something and the onPressed method of the according button is triggered.... However, first you create the ToDoItem. Then you access the List we made accessible with the reference. Then we change the "state" of that provider to a new state which is defined as all the old ToDoItems plus the newly created one.
If you have any pages in your app where you can see all the ToDoItems, you will now see one more.
I hope this is okay as a starting point.
I'm using the following flutter code to query firestore which orders the data using the field timestamp.
var results = Firestore.instance.collection('post').orderBy('timestamp').getDocuments().then((value) {
var list = value.documents;
return list.map((doc) {
return doc.documentID;
}).toList();
});
When I run this code, it throws the below exception saying an index is required:
W/Firestore(31110): (21.3.0) [Firestore]: Listen for Query(app/jQH7Fp9xCZWYiqZRe7lE/post where readAccess array_contains_any [WzKImODx6WYVqdSW3D9Az3xrUnM2, PUBLIC] order by -timestamp, -name) failed: Status{code=FAILED_PRECONDITION, description=The query requires an index. You can create it here: https://console.firebase.google.com/v1/r/project/....
The exception even comes with a nice link. When opening that link, a nice UI pops up giving me the ability to create the index, with just a simple click:
Question: simple as the above may seem, I'm not very happy with this. I prefer to be able to create the index from fluttercode. In code I'm looking for something like the below:
Firestore.instance.collection('post').API-TO-CREATE-INDEX('timestamp');
Does it exist? Please advise. Many thanks.
It's not possible to create an index from client apps. You have three main choices:
Clicking the link you already saw.
Using the Firebase CLI to deploy the index from the command line.
Using the gcloud CLI to also deploy from the command line
See also the documentation on managing indexes.
I am currently upgrading an old IONIC 1 app (adding new features). I have read a lot of threads but didn't find any answer to my question.
First of all, my Firebase Database structure looks as follows:
-products
--productId
--- imageurl
--- price
--- title
--- likes: 0
I would like to increment the value of child likes everytime a user triggers (for instance clicks a like button).
my service.js function looks as follows:
incrementLikeproduct: function(prodId){
return ref.child('products').child(prodId).child('likes').set( xxxx );
},
I have tried to retrieve the current value of the likes child object from firebase as a var and add +1; but didn't get anything to work properly. I basically do not know how to replace the xxxxx in my function to obtain the expected result.
My question is: How shoud I write the incrementLikeproduct function to increment the likes child value in firebase? I have read about asynchronous listener but can't figure out how to implement it inside my service.js.
I know that IONIC1 is outdated but I had already a solid piece of code to which I wanted to add new features without starting the whole app dev from scratch.
I am quite noob with JS and would be greateful if someone could give me a hint :-).
You should update your likes like below code:
return ref.child('products').child(prodId).update({
likes:xxx
})
thanks
What I'm trying to achieve is that if i have 2 components nodes :
component1
clientlib
component1.js
component2
clientlib
component2.js
and i drag them into page1, then when page1 is generated, only component1.js and component2.js will be loaded when navigating to page1 .
One approach i saw is to use custom Tag Library as described here : http://www.icidigital.com/blog/best-approaches-clientlibs-aem-part-3/
I have two questions :
1) is there an existing feature in AEM to do this ?
2) if not, what is the easiest way to create such custom Tag Library ?
EDIT:
Assume that there is no ability to just include all component clientLibs, rather load only those that are added to the page.
There is no built in feature to do this. Although I've heard that the clientlib infrastructure is being looked at for a re-write so I'm optimistic that something like this will be added in the future.
We have, and I know other company have, created a "deferred script tag." Ours is a very simple tag that take a chunk of html like a clientlib include, add it to a unique list and then on an out call at the footer, spits it all out one after another.
Here's the core of a simple tag implementation that extends BodyTagSupport. Then in your footer grab the attribute and write it out.
public int doEndTag() throws JspException {
SlingHttpServletRequest request = (SlingHttpServletRequest)pageContext.getAttribute("slingRequest");
Set<String> delayed = (Set<String>)request.getAttribute(DELAYED_INCLUDE);
if(delayed == null){
delayed = new HashSet<String>();
}
if(StringUtils.isNotBlank(this.bodyContent.getString())){
delayed.add(this.bodyContent.getString().trim());
}
request.setAttribute(DELAYED_INCLUDE, delayed);
return EVAL_PAGE;
}
Theoretically the possible way of doing is to write script in your page component/abstract page component that does something like this -
Step1 : String path = currentPage.getPath()
Step2 : Query this path for components (one way is to have a master list do a contains clause on sling:resourceType)
Step 3: User resource resolver to resolve the resourceType in Step 3, this will give you resource under your apps.
Step 4: From the above resource get the sub-resource with primary type as cq:ClientLibraryFolder
Step 5: from the client libs resource in Step 4 get the categories and include the JS from them
you could actually write a model to adapt a component resource to a clientLibrary to actually clean the code.
Let me know if you need actual code, I can write that in my free time.
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.