bindonce | Zero watches binding for AngularJs
kandi X-RAY | bindonce Summary
kandi X-RAY | bindonce Summary
AngularJs provides a great data binding system but if you abuse of it the page can run into some performance issues, it’s known that more of 2000 watchers can lag the UI and that amount can be reached easily if you don’t pay attention to the data-binding. Sometime you really need to bind your data using watchers, especially for SPA because the data are updated in real time, but often you can avoid it with some efforts, most of the data presented in your page, once rendered, are immutable so you shouldn’t keep watching them for changes.
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QUESTION
I am working on a web scraping problem in Ruby. I have seen multiple questions and answers related to this but in none I have seen HTML that include some JavaScript framework in it and I cannot figure out how to do it. I just want to select the HTML and return an array of objects. The following is my script and the HTML code. The HTML classes of the values like name, currency, balance are similar and the question of how can it be done?
...ANSWER
Answered 2020-Apr-14 at 07:49Using CSS:
QUESTION
Currently trying to update from angularjs 1.2 to 1.3 and have discovered a problem. The app has a paging directive:
...ANSWER
Answered 2019-Oct-10 at 02:20You might want to include $parent before currentItem. Something like below
Usage:
QUESTION
Using Python3 I am trying to get Chrome Webdriver and Selenium to identify the various 'Classifieds' categories on the webpage www.jtinsight.com and from there print out the category titles. So far using the code below the best i can do is get it to print out the first two - 'All categories' and 'Cars(Private)'. I have identified that the html for these two is different to the others and tried a number of different lines of code which i have listed in the code commented out, but cant identify the right tag/class/xpath etc. Any help would be appreciated.
...ANSWER
Answered 2019-Mar-22 at 12:11This is really a timing issue. If I added a "sleep(5)" before collecting categories, it found all 24. Interestingly, when I used a WebDriverWait instead, it would still only pull up 2 items. So, to force the driver to do a little more work I extended the xpath. the following worked for me:
QUESTION
I've been working with AngularJS to upgrade our project's version from 1.2.16 to 1.6.4. Since we are using bower as package manager, I've updated the necessary parts of bower.json as below:
...ANSWER
Answered 2017-Jul-10 at 08:22The angular-busy
module is not created by the AngularJS team. The function addPromiseLikeThing
looks suspicious and is the last thing executed before entering the $q library where it blows up. Faking the $q library with a 'promiseLike' object is likely the cause of the error.
In addition AngularJS V1.6 changes the way rejections are handled. The error message:
angular.js:14525 Possibly unhandled rejection: {"data":{"status":401,
is a result of those changes.
For more information, see AngularJS Developer Guide - Migrating to V1.6 ($q)
QUESTION
I have a filter that changes filtered object. But when I'm using ng-style="item.gridSize"
My Filter: (The Algorithm for size Grid was taken (changed for my needs) from Here
ANSWER
Answered 2017-Mar-11 at 23:04There were a couple of issues. It was not exactly a ng-style
problem, but rather than in each digest cycle your photos were calculating different style objects, causing another digest cycle to run.
Some issues I've found:
- Error in logic was giving 0 colums, thus causing size to give
NaN
when calculatingmargin-top
and failing. To fix this, I added a default value from 1 column. - your
Math.random() > 0.8
was giving different results in each time your filter function was executing. In each digest cycle, sinceMath.random()
gives different results, it was forcing another digest loop (you were updating gridSize object - since there's a$watch
for each element in theng-repeat
it detects the changes and forces one digest cycle), and so on. That was the error log in console.
I created this fiddle that works. The main changes are
defined a fixed random value for each photo, after declaring your array
QUESTION
I created a nested tree which may have 1 - 5000 items, I am able to make it work but it freezes my browser\loading spinner for few seconds just before showing the tree.
How can I make it smooth so browser would never freeze ?
How can I know when angularjs finished creating or rendering or computing (not sure right word) whole list so that I could remove loading spinner then, as you can see scope.$last won't work as we have nested ng-repeat and same for scope.$parent.$last
Here is plunker I created but with demo data -
http://plnkr.co/edit/GSZEpHjt5YVxqpg386k5?p=preview
Example dataset - http://pastebin.com/YggqE2MK
It's not too bad in this example but at points my browser freezes for more then 10 seconds for around 4000 items in my OWN setup with all other components.
What I already considered
- used bindonce.js library but without much success
- used "::" single binding without much success again
- only load first level then render next level when user expands a category but my tree can be very random, maybe I only have 1 single root node with 100s child nodes
- pagination is not ideal for scenario
HTML
...ANSWER
Answered 2017-Mar-02 at 10:32The way I handle this is:
In Controller :
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