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Angular check if array contains object with specific variable value


By : Tony Calderone
Date : October 15 2020, 08:10 PM
will be helpful for those in need You can simply go back to the basic and do something along thoses lines :
code :
const itemToAdd = new Item(smallItem, false, true);
if(this.Items.findIndex((item) => item.smallItem === itemToAdd.smallItem) < 0) {
    this.Items.push(itemToAdd);
}
if(this.Items.findIndex((item) => item.smallItem === smallItemToAdd) < 0) {
    this.Items.push(new Item(smallItemToAdd, false, true););
}


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Watch a specific attribute of each and every object in an object array - Angular material


By : Ankit Kumar
Date : March 29 2020, 07:55 AM
it should still fix some issue Finally, I have solved my problem. Instead of watching the specific attribute, I chose the ng-change. It simply has the ability to change the appropriate attribute.
app.js
code :
var app = angular.module( 'app', ['ngAria', 'ngAnimate','ngMaterial']);

app.controller('appController', function ($scope) {
    $scope.modes = [{id: 1}, {id: 2}, {id: 3}];

    $scope.items = [
  {id: "1", text: "word", textMode: {id: 1}},
  {id: "2", text: "word", textMode: {id: 1}},
  {id: "3", text: "word", textMode: {id: 1}}
  ];

  $scope.onChange = function(item) {
    if (item.textMode.id === 1) {
        item.text = "word";
      } else if (item.textMode.id === 2) {
        item.text = "phrase";
      } else if (item.textMode.id === 3) {
        item.text = "paragraph";
      }
  };
});
<div ng-app="app">
  <div ng-controller="appController">
    <div ng-repeat="item in items">
      <md-select aria-label="textChanger" class="selector" ng-model="item.textMode.id" ng-change="onChange(item)" placeholder="Text mode ID">
        <md-option ng-repeat="mode in modes" ng-value="mode.id">
          {{mode.id}}
        </md-option>
      </md-select>

      <br>
      {{item.text}}

      <br><br><br>
    </div>
  </div>
</div>

How to check if object exists inside array of object in Angular


By : user3402924
Date : March 29 2020, 07:55 AM
I hope this helps . I am using Angular 8. I want to check in Angular if object exists inside array of objects or not. My object is : , If you want get all objects which exist, then you can filter it:
code :
let objVenIns = {
'CntNumber': 4,
'CntMixer': 2,
'DevicePositions': 'NA',
'AddComments': 'NA',
};


let arrRowData = [
{'SrNo' : 1, 'Name' : 'ABC', 'CntNumber': 1,'CntMixer': 3,'DevicePositions': 'Right','AddComments': 'NA'},
{'SrNo' : 2, 'Name' : 'DEF', 'CntNumber': 4,'CntMixer': 2,'DevicePositions': 'NA','AddComments': 'NA'},
{'SrNo' : 3, 'Name' : 'XYZ', 'CntNumber': 2,'CntMixer': 5,'DevicePositions': 'Left','AddComments': 'NA'}
];

const result = arrRowData.filter(f=>
f.CntMixer === objVenIns.CntMixer &&
  f.CntNumber === objVenIns.CntNumber &&
  f.DevicePositions === objVenIns.DevicePositions &&
  f.DevicePositions === objVenIns.DevicePositions &&
  f.AddComments === objVenIns.AddComments
);

console.log(result);
console.log(result.length > 0 ? 'exists' : 'no');

How to put in angular template to check if a specific array contains an object with property that equals to some value?


By : user3431984
Date : March 29 2020, 07:55 AM
I hope this helps you . Fixing your solution
Some problems with your code were already mentioned in other answers. Another thing to remind you of is the way you modify the eating property: You have to make sure to replace the array with a new array, each time an entry changes. Else the Change Detector will not pick up your changes.
code :
<div *ngIf="myarrayContainsEating('Chocolate')">Chocolate Is Good</div>

<button (click)="charlesEatChoc()">Make Charles eat Chocolate</button>
myarray = [{'name':'Charles', 'age':25, 'eating':'Vanilla'}, {'name':'Joseph', 'age':18, 'eating':'Banana'}]

myarrayContainsEating(food) {
   return this.myarray.some(entry => entry.eating === food); // Check if any "eating" property is equal to food
}

charlesEatChoc() {
  this.myarray = this.myarray.map(entry => // This returns a new array (!!!IMPORTANT!!!)
     entry.name === 'Charles' // Map the entry if it matches your condition
        ? {...entry, eating: 'Chocolate'} // If it does, create a new one with the altered eating property
        : entry // If not, return the entry itself without modification
  );
}
<div *ngIf="myarray | containsFood:'Chocolate'">Chocolate Is Good</div>

<button (click)="charlesEatChoc()">Make Charles eat Chocolate</button>
myarray = [{'name':'Charles', 'age':25, 'eating':'Vanilla'}, {'name':'Joseph', 'age':18, 'eating':'Banana'}]

charlesEatChoc() {
  this.myarray = this.myarray.map(entry => // This returns a new array (!!!IMPORTANT!!!)
     entry.name === 'Charles' // Map the entry if it matches your condition
        ? {...entry, eating: 'Chocolate'} // If it does, create a new one with the altered eating property
        : entry // If not, return the entry itself without modification
  );
}
import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'containsFood'
})
export class ContainsFoodPipe implements PipeTransform {

  transform(value: Array<any>, food:string): boolean {
     return value.some(entry => entry.eating === food); // Check if any "eating" property is equal to food
  }

}

How to check if a variable is an array, but not a specific type array in Swift?


By : Jeremy
Date : March 29 2020, 07:55 AM
it should still fix some issue I don't know if reflect is any more or less stable than _stdlib_getDemangledTypeName, but it's another option:

Angular 7 correct way to check if JSON parse returns a specific object


By : Bryon McIntire
Date : October 07 2020, 11:00 AM
help you fix your problem I'm a little confused about this. , Here is the simple way to check it:
code :
checkJsonObject(string) {
    try {
        JSON.parse(string);
    } catch (e) {
        return false;
    }
    return true;
}
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