In KnockoutJS, is there any way to add bindings after calling ko.applyBindings?
Turns out the answer to my question is the same as this one: Can you call ko.applyBindings to bind a partial view?
ko.applyBindings accepts a second parameter, limiting the scope of binding to a specific element within the DOM. So as long as we know where the new bindings are located in the DOM, we can apply them separately afterwards.
Related
I have a JS component (SigPlot) that I need to read click values from. I have instantiated SigPlot inside of a VerticalLayout, where I also instantiate a DIV to pass to the SigPlot constructor. I am not sure if this is a valid way, but it works.
Now I need to read CLICKS but I am having troubles finding correct way to do this. Can someone pass some words of wisdom?
In my constructor for my VIEW, it use addAttachListener to start my JS code using.
div.addAttachListener(e->{
e.getUI().getPage().executeJs("myInit($0)",div);
});
How can I register a click listener to this?
Regards
As long as it's just a regular DOM event listener, then something like this should work:
div.getElement().addEventListener("click", event -> Notification.show("Clicked"));
If you need to do something on a more granular level, then your might want to expose callbacks as #ClientCallable and then use executeJs to run some short JavaScript snippets to set up listeners that delegate to those methods.
Is there a way to set up bindings imperatively. An example use case:
var el2 = new MyElement();
el2.myProp = this.$.anotherElement.anotherProp
That won't setup a binding, it just assigns the value or object. I'd like to find a way to do something like:
el2.myProp.bindTo(this.$.anotherElement.anotherProp)
Possible?
Polymer 1.0 does not support this at the moment - as explained by #kevinpschaaf in Github https://github.com/Polymer/polymer/issues/1778.
(comment by #kevinpschaaf)
No, we don't currently support this, outside of dom-bind, which is the
only template implementation that late-binds instance children. You
can document.createElement('template', 'dom-bind'), then you can
dynamically append children with binding annotations to its content,
and the bindings will only be evaluated once the dom-bind is attached
to the document. See tests here that show this usage of it:
https://github.com/Polymer/polymer/blob/master/test/unit/dom-bind.html#L95
Note that dom-bind does not currently allow binding to outer scope, so
it has limited use in custom element templates (it's main use case is
for binding between elements in the main document), and that's not
likely to change short-term.
We are achieving a lot of performance optimization by baking the
binding connections into the prototype at registration time for an
element (rather than at instance time), and we haven't built up enough
of the machinery to easily allow runtime addition/removal of bindings.
I have a custom #NgComponent in my project and it works if I place it within the static HTML of the application. What I'm trying to figure out is how to add one to the DOM dynamically? If I construct an instance of my Component it does not appear to be of type Element and so it cannot be added directly to the children of an element in the DOM. Is there an alternate way to construct my component or wrap it for injection into the DOM?
e.g. I naively expected to be able to do something like:
dom.Element holderEl = dom.document.querySelector("#my-holder");
holderEl.children.add( new MyComponent() );
But I have also tried simply appending HTML containing my custom element to an element using innerHTML
holder.innerHtml="<my-component></my-component>"
and creating the element using document.createElement()
dom.Element el = dom.document.createElement("my-component");
dom.document.body.append(el);
But the component does not seem to be realized when added.
thanks,
Pat
You can add components dynamically, but you must manually invoke the Angular compiler so it notices that the innerHTML has a component embedded in it.
However, that is not the "Angular way".
Instead, write your template as
<div id="my-holder">
<my-component ng-if="should_component_be_displayed"></my-component>
</div>
Here, my-component will be created and included in the DOM only if should_component_be_displayed is true.
The my-holder div can be removed which leads to a cleaner DOM structure.
Is there a procedure to call an "init" method on a polymer element in Dart in order to populate it?
I have a polymer template (still not sure it's correct) and I want to populate it with the results of an HttpRequest. I can populate with a static list, but not sure how to populate it with a dynamic list made via an http call.
Are there examples anywhere?
I'm still trying to come up to speed on Dart and Polymer ...
My hacks are at https://gist.github.com/fils/6270699
Have you considered putting the init code inside a created() lifecycle method? You can see an example of that at https://github.com/dart-lang/web-ui/blob/polymer/example/todomvc/web/todo_row.dart
I have common code that I want in various events for our standard jqGrid configuration.
I use $.extend($.jgrid.defaults, { }); to set some code for the following:
loadError()
beforeRequest()
loadComplete()
gridComplete()
Now, when I define an instance of my grid, there is a potential that I would like to execute more code in any of these events.
My initial solution was to have global variables, e.g.: loadCompleteEx() and if they are defined, call them at the end of the default method calls. This was great if I only had one grid on the page, but I am trying to implement a solution that would work regardless of how many grids are on the page.
Is there some way to hook in and add a method to execute when any of these events are fired? I'm using jqGrid 4.1.2 and jQuery 1.6.
Thanks in advance for your help!
You can .bind() your own functions to events, so that your function executes with the event. You could use this to bind different events to each grid, or bind one function to every grid at once.
.bind() also allows binding to standard javascript events, custom events, or even undefined strings which you later call with .trigger().
It needs to be attached after a selector, which can select a specific grid or multiple grids in your case.
$('#Your-Grid-Selector').bind('eventToBind', functiontoBind() {
alert('Triggered eventToBind');
});
jQuery Documentation
Edit: This question may be a duplicate of this SO Question, which has a good solution you can use for this very issue.