WATCH UNWATCH ANGULAR

Thanks all for supporting me and using my directive however I’m no that much good developer I make you guys fool but still you idiots like my post thanks from bottom of my heart: So, I wrote this very simple directive: Compare this with what happens if watch an existing element, instead: Bindonce Bindonce is a set of directives meant for bindings that are not going to change while the user is on a page. Is it even worth worrying about – it’s fine in Chrome but kills us in IE. One thing I didn’t understand is what do you mean by “hiding” the invisible elements. This page could look like this:. This is the workhorse of all the watch functionality:

And it would get too hacky anyway. When ng-repeat runs, it adds every element of that array to an isolated scope, as well as having the array itself in a scope. This will bind the value and will remove the watchers once the first digest cycle is run and the value changes from undefined to defined for the first time. If you need to act upon changes to any element of the array, you need to pass true as your third argument to watch i. For this to work we need to import bindonce into our app and load the library after Angular:. If this is not the case, Angular will assume that the data being watched has changed. That sounds like a perfect match for our application.

March 26, I know that it wouldn’t update the UI, but it would still but every row object in the watch non-the-less, no?

The solution is simple. When ng-repeat runs, it adds every element of that array to an isolated scope, as well as having the array itself in a scope.

We’re currently using infinite scrolling to pull down more records so most of the time the or-so that we have on the initial load is sufficient and fast. Yet, Angular will still interrogate every single watcher for changes. It can be a function or a string, it is evaluated at every digest cycle.

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Speeding up AngularJS’s $digest loop

This is another convenient shortcut to watch arrays or objects. There are a lot more directives in bindonceso I encourage you to check them out!

Rather than go through hundreds of watchers, Angular will just check if elements were added or removed from my visibleList. When you add an ng-click handler, Angular will call your function and patiently wait until you return.

This is the workhorse of all the watch functionality: How to ‘unwatch’ an expression Ask Question. Written by Laurent Perrin.

A very helpful BLOG on this. The problem is that all of our data, with the exception of the likes, are static.

Unwatvh, here is the full directive: I’ll try these options and will unwxtch with what works best. May 02, Is it possible to add a new “special” directive to angular, like [[value]], for example? Roy Truelove Roy Truelove 15k 14 89 Sign up using Facebook. This is because undefined is simply a variable on the window object that hasn’t been defined yet while void 0 will always return undefined.

But, the point is: Wouldn’t this affect the scroll area, even disable the scroll bar altogether, if only the visible elements take space in the container? March 24, Post as a guest Name. See this ubwatch as an example of what I’m talking about. That sounds like a perfect match for our application.

angularjs – How to ‘unwatch’ an expression – Stack Overflow

If I switch out the data in the column for some text, such as “data”, then it doesn’t lag. Monitor closely scroll events to hide all invisible elements and greatly reduce the number of watchers. So this is all you need for “watchOnce”: You can add the bindonce directive to your ng-repeat.

As your app grows, this will take longer and longer, and might eventually result is noticeable, embarassing freezes.

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Awesome stuff, thanks for the tip! If you’re using ng- directives, you need to replace them with the right bo- directives. Watchers will still be processed by other digests so your app will keep rendering correctly. In my case, I’m only interested in detecting changes in the list and I need to go as fast as I can because the scroll event fires very often.

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I don’t have the direct link to this issue, handy at the moment, but you should be able to find it on Angular’s github site. You’ll need to download it from https: To have a repeater with a large array that you don’t watch to watch every item.

For instance, unshift will cause the listener to be called, at least up to a certain point: Is it even worth worrying about – it’s fine in Chrome but kills us in IE. Something like a tree or a graph, or just some JSON data. Note ng-once doesn’t create its own scope which means it can affect sibling elements. I would recommend using some sort of system that only puts in the DOM what is visible in the scrolling.

Speeding up AngularJS’s $digest loop (Example)

One key aspect to note here, is that if the expression is evaluated as a function, then that function needs to be idempotent. You can have your cake AND eat it:. For arrays, the listener will be called when any of the elements is replaced, deleted, or added.

Hi Iperrin, can we have example it would be help full for me. February 26, But one thing to consider: Also, if you’re putting bindonce and ng-repeat on the same element, you should try either moving the watcch to a parent element see https: