When a user clicks on a link, it uses routing to send the user to another component, you start at home and can click to charts. My problem is that I need to get the queryselector for the charts element, but when code is loaded from the component, it doesn't exist yet. How can I wait for the element to be created to execute the code?
I solved this by adding a MutationObserver inside the constructor.
Element chartsElement;
ChartsComponent() {
MutationObserver observer = MutationObserver(_onMutation);
Element my_app = querySelector('my-app');
observer.observe(my_app, childList: true);
}
_onMutation(List<dynamic> mutations, MutationObserver observer) {
mutations.forEach((value) {
MutationRecord record = value as MutationRecord;
if (record.addedNodes.contains('charts')) {
chartsElement = record.addedNodes[0];
}
});
observer.disconnect();
//Do stuff
}
Related
I have a ListGrid defined like this:
ListGrid lgrid = new ListGrid();
ListGridField first = new ListGridField("first",first");
ListGridField second = new ListGridField("second ",second ");
lgrid.setFields(first, second);
lgrid.setShowFilterEditor(true);
¿How can i put the keyboard focus in the first filter editor field after i call show() in the layout?
Thxs in advance.
Depending on what your use case is (which would be useful to provide a more focused answer), the solution you posted might not be what you really need, because if you scroll on your ListGrid, it could trigger a new data fetch (if there are more records to show), and move the cursor to the filter editor as a result (if your user is editing some records at that point, the cursor moving to the filter row is not what she would want to happen!!).
In such a case, you probably just want to call grid.focusInFilterEditor("fieldToFocus") after the listGrid.show() statement or in the ClickHandler of some button you use to fetch the data, etc.
Anyway, you don't need the Timer either. This works:
listGrid.addDataArrivedHandler(new DataArrivedHandler() {
#Override
public void onDataArrived(DataArrivedEvent event) {
grid.focusInFilterEditor("fieldToFocus");
}
});
I got the solution, its focusInFilterEditor, this is an example to set the focus after the data arrived to the grid:
// Put the focus on the first listGrid field when is loaded
listGrid.addDataArrivedHandler(new DataArrivedHandler() {
#Override
public void onDataArrived(DataArrivedEvent event) {
Timer t = new Timer() {
public void run() {
if(listGrid.getFilterEditorCriteria() == null){
listGrid.focusInFilterEditor("fieldToFocus");
}
}
};
t.schedule(600);
}
});
Given the dart code
class LandingController {
bool hideDiv = false;
void doit() {
new JsObject(context['loginControls']).callMethod('fadeLogin', [() {
print(hideDiv);
hideDiv = true;
print(hideDiv);
print("WTF");
}]);
}
}
which calls the JS:
var loginControls = function() {
this.fadeLogin = function(func) {
$('#landingHeader').animate({ opacity: 0 }, 500, func);
}
};
which should affect the view:
<button ng-click="doit();">Click</button>
<div id="landingHeader">Hide me after button click</div>
<div ng-if="ctrl.hideDiv == false"><img src="assets/img/ajax-loader-small.gif">Waiting for div to disappear...</div>
After a button click and a 500 millisecond delay I see in my console a "WTF" print correctly. The div, however, is still visible. Once a user action occurs, in my case a mouse click, the div magically disappears. It seems as though the controller's value is changed, but the browser doesn't receive the change to hide the div, as I've printed the controller's value in the anonymous callback.
There is a work around, but it involves setting Dart timer's to the same fade times that you use in the javascript after the JsObject call and setting your controller's values in those Timer callbacks - gross but it works.
I think you need to call scope.apply(). I think Angular just can't recognize the value change in hideDiv when doit() is called from another zone (like JS).
You usually don't need to call scope.apply() in Angular.dart but I think this is one of the exceptions.
Is the animate function the only reason you use jQuery? It might be easier to do this with Angular.darts animation features.
I have three toolbar buttons in my edit page of my component (joomla 3.0).
view.html.php
protected function addToolBar()
{
JToolBarHelper::apply('editpage.apply');
JToolBarHelper::save('editpage.save');
JToolBarHelper::cancel('editpage.cancel');
}
This works great. But now when I change the redirect path of my save method in the controller like this...
controller/editpage.php
function save()
{
parent::save();
$this->setredirect(JRoute::_('index.php?option=com_mycom&view=productlist', false));
}
... than by a click on "apply", the user was also redirected to this path. And this is the problem. Without this override method in controller, the apply button works fine. All fields will be saved and the edit page will not leave. So how can I solve that problem?
Both Save and apply method call to the same function of joomla library to save the records. The better way to over come the issue is
view.html.php
protected function addToolBar()
{
JToolBarHelper::apply('editpage.tasktoApply'); // any name other then apply
JToolBarHelper::save('editpage.tasktoSave'); // any name other then save
JToolBarHelper::cancel('editpage.cancel');
}
controller/editpage.php
function tasktoApply()
{
parent::save();
$this->setredirect('ANY CUSTOM REDIRECT AS PER YOUR NEED', false));
}
function tasktoSave()
{
parent::save();
$this->setredirect('ANY CUSTOM REDIRECT AS PER YOUR NEED', false));
}
This would sort out your issue
Couple of days ago I found this interesting post at http://www.smartjava.org/content/drag-and-drop-angularjs-using-jquery-ui and applied it into my website. However when I progressively using it there is a bug I identified, basically you can not move an item directly from one div to another's bottom, it has to go through the parts above and progress to the bottom. Anyone can suggest where does it goes wrong? The example is at http://www.smartjava.org/examples/dnd/double.html
Troubling me for days already.....
I did this a bit differently. Instead of attaching a jquery ui element inside the directive's controller, I instead did it inside the directive's link function. I came up with my solution, based on a blog post by Ben Farrell.
Note, that this is a Rails app, and I am using the acts_as_list gem to calculate positioning.
app.directive('sortable', function() {
return {
restrict: 'A',
link: function(scope, elt, attrs) {
// the card that will be moved
scope.movedCard = {};
return elt.sortable({
connectWith: ".deck",
revert: true,
items: '.card',
stop: function(evt, ui) {
return scope.$apply(function() {
// the deck the card is being moved to
// deck-id is an element attribute I defined
scope.movedCard.toDeck = parseInt(ui.item[0].parentElement.attributes['deck-id'].value);
// the id of the card being moved
// the card id is an attribute I definied
scope.movedCard.id = parseInt(ui.item[0].attributes['card-id'].value);
// edge case that handles a card being added to the end of the list
if (ui.item[0].nextElementSibling !== null) {
scope.movedCard.pos = parseInt(ui.item[0].nextElementSibling.attributes['card-pos'].value - 1);
} else {
// the card is being added to the very end of the list
scope.movedCard.pos = parseInt(ui.item[0].previousElementSibling.attributes['card-pos'].value + 1);
}
// broadcast to child scopes the movedCard event
return scope.$broadcast('movedCardEvent', scope.movedCard);
});
}
});
}
};
});
Important points
I utilize card attributes to store a card's id, deck, and position, in order to allow the jQuery sortable widget to grab onto.
After the stop event is called, I immediately execute a scope.$apply function to get back into, what Misko Hevery call,s the angular execution context.
I have a working example of this in action, up in a GitHub Repo of mine.
Imagine, you want to listen to all clicks made to any anchor element on page. The anchors on page can be dynamically added/removed during the page lifetime and you want to register all of the click events, even on newly added.
Is there any way how to attach delegated event (like in jQuery) in Dart using its standard libraries?
In jQuery you can achieve this with element.on('click', '.selector', handler);.
You can now do that with ElementStream.matches like this :
document.body.onClick.matches('.selector').listen((Event event) {
print('Super cool!');
// The currently registered target for the event
// document.body
event.currentTarget;
// The element whose CSS selector matched
// .selector
event.matchingTarget;
// The target to which the event was originally dispatched
// the real element clicked under .selector
event.target;
});
Because I have found no viable solution, I have created package that enables delegation.
You can find it at
http://pub.dartlang.org/packages/delegate
Code is simple:
delegate(parent, condition, handler) {
return (event) {
var element = event.target;
while (element != parent && element != null) {
if (condition(element)) {
handler(event, element);
}
element = element.parent;
}
};
}
delegateOn(parent, String eventType, condition, handler) {
parent.on[eventType].listen(delegate(parent, condition, handler));
}