angular-ui/ui-grid

How to Reduce the number of $watches created by ui-grid

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#4,554 opened on Oct 20, 2015

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help wantedseverity: performance

Description

Hello :-) first i just wanted to say thanks for this great project.

we integrated ui-grid as part of our table-grid , and for some unknown reason the amount of watches generated by the ui-grid is huge for the amount of data we trying to process.

for example : grid - 9 columns table with 20 rows of simple text based cells without any custom cell template

inspecting the $watches we getting amount of 960 watches.

trying to debug this issue we printed each element that has watch on him and most of the times we got this kind of elements :

[ div#1445359168448-19-uiGrid-001Z-cell.ui-grid-cell.ng-scope.ui-grid-coluiGrid-001Z, context: div#1445359168448-19-uiGrid-001Z-cell.ui-grid-cell.ng-scope.ui-grid-coluiGrid-001Z] and each cell element got 2-4 watches.

we used simple data structure with basic columnDefs (field + display name) .

in most of our cases we don't need to watch for chances in specific grid cells.

is there anything we can do to reduce the number of $watches created by ui-grid ?

thanks in advance, elad.

Contributor guide

Tech stack
javascripthtmlcss
Domain
frontend
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
AngularJS basicsUnderstanding of $watch
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
The issue asks how to reduce the number of $watches created by ui grid. Investigate the ui grid source code (likely in JavaScript) to understand how cell directives create watchers. Look at the grid rendering lifecycle, cell templates, and possible optimizations like one time bindings or disabling unnecessary watchers. The repository is angular ui/ui grid, and the issue number is 4554. Start by examining the grid's cell rendering logic in files like 'ui grid cell.js' and related directives.