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Questions tagged [angularjs-track-by]

51 questions
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Angular ngFor rerender trackBy when changing the array position

I want the ngFor not to re-render when the id change the index/position on the array. The trackBy method not working as I expected in this situation. Consider code below, In the TS File users: User[]; constructor() { this.change1(); } …
oz1985oz
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Angular trackBy giving Missing Properties Error

I am using track by function in my ionic angular app and while building the app, it gives me error: Type '(index: any, item: any) => any' is missing the following properties from type 'any[]': pop, push, concat, join, and 25 more. I am using this…
Kartik Solanki
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How to use trackBy on AsyncPipe with images rendering, it re- renders page every time?

My question is how to use trackby on Async pipe with images rendering under it. I have done following. in html
and in my…
Ranjeet Avghad
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AngularJS: How do I animate the text if $index changes?

I have an app in angularjs which uses $interval() in background and requests datas form the database via PHP every seconds. I then use track by $index which really helps on performance.
DuliNini
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Ionic virtualScroll does not refresh after list order change

Using Ionic3 and virtualScroll works fine when I sort the list in the constructor but when I use a sort button on my page to change the sort order of the list, the sort is done but the list is not refreshed. I've seen virtualTrackBy but I'm not sure…
pic
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Track by is not working with ng-repeat and ng-value

// this.data = [{value: 'damon'}]; // this.dataOrf = [{value: 'damon'}, {value: 'mean'}] …
Deamon
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Duplicate ng-repeat with track by

How to allow duplicate in ng-repeat with track by and update ng-repeat list from controller ? By using track by $index i am not able to update scope variable, but i want to allow duplicate object in ng-repeat Condition : 1) allow duplicate in…
Rohit
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Angular Materials md-select and trackBy allowing options to be selected

I'm trying to customise this Angular Material example code (https://material.angularjs.org/latest/api/directive/mdSelect) to my needs. I have three groups of select options. If an option is selected in a group, it should unselect all options in…
Misha Tsvelik
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Angular 2 *ngfor doesn't update with sequential http request responses

I have an empty array, called rows and I want to display it with *ngFor. On each row of the array I pass the response from an http request. All the http requests are called sequentially. Even though the array is fed correctly, the *ngFor is never…
dimitris maf
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Catch duplicates and ignore them inside ng-repeat's track by without a filter (AngularJS)

I'm having some issues using ng-repeat with track by because sometimes duplicate data comes in (same user) because the user was pushed down in the date ordered list (API side) after a newer entry has been pushed to the beginning of the array. I…
Edgaras Kazimieras Kazlauskas
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Angular v1.4 repeat a div without re-rendering already rendered items

I wrote code to repeat an image array and a load more button to ajax request and push response images in that array. But every time new response comes then whole images reshuffled.
Moshi
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angular select 'track by' resets selected

I'm struggling getting "selected" to work with 'track by' for Angular select element. I have the following select:
Vasu Sheoran
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DOM keeps being rebuilding with angular-selectize ng-repeat and track by

I'm using AngularJS with the angular-selectize module. To populate the page with the elements I need I use something like this: index.html
Oleg Kirichenko
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