Is there a way to selectively filter and display certain data in an Angular data table?

Question

Is there a way to selectively filter and display certain data in an Angular data table?

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I am currently working on a project using Angular 7 frameworks that involves dealing with large amounts of data. One of the tasks is to filter out trial units based on the 'userName' field in the raw data.

I have various usernames such as user22abc@ngul, user23abc@ngul, user67abc@ngul, and so on. These are sample 'userName' values that indicate trial units which need to be removed. I am looking for guidance on the specific syntax I can use to achieve this in my code. Thank you!

There are 50 trial units in my raw data set that need to be eliminated. Can someone suggest a solution or guide me on how to modify the existing code? I have tried browsing through examples and solutions but haven't been able to grasp it completely. I have also attached a sample of the code for reference.

Appreciate any help provided!

angular typescript

Answer 1

Answer №1

If you are unsure about the precise structure of your data for displaying on a datatable, let's consider a common scenario where the data is an array of objects in the following format:

const original = [
  {
    userName: 'user22abc@ngu',
    name: 'aaa',
    id: 'aaa1'
  },
  {
    userName: 'user33azzz@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
]

To avoid mutating the original array, we can make a shallow copy using the spread syntax. Then, we can use the Array.filter() method to filter out objects with specific usernames.

const filteredCopy = [...original].filter(row => row['username'] !== 'user22abc');
console.log(filteredCopy);

In case we need to filter based on an array of usernames, some adjustments are needed. The custom function passed to filter() has two conditions:

1) Utilizing includes() to check if the username list contains the element's username. By negating this statement (using !), we get elements whose usernames are not in the usernameList array.

2) Checking if the first 4 characters of the username match the string user.

const original = [
  {
    username: 'user22abc@ngu',
    name: 'aaa',
    id: 'aaa1'
  },
  {
    username: 'user33azzz@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
  {
    username: 'user11@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
  {
    username: 'bzzzz@ngu',
    name: 'bbab',
    id: 'bbb12'
  },
]

const usernameList = ['user22abc@ngu', 'user11@ngu'];

const filtering = usernameList => {
  const filteredCopy = [...original].filter(row => !usernameList.includes(row['username']) && row['username'].substring(0,4) === 'user');
  return filteredCopy;
}

filtering(usernameList);

Note that .includes() is part of ES7 and may not be supported by older browsers like Internet Explorer.

Answer 2

If you are unsure about the precise structure of your data for displaying on a datatable, let's consider a common scenario where the data is an array of objects in the following format:

const original = [
  {
    userName: 'user22abc@ngu',
    name: 'aaa',
    id: 'aaa1'
  },
  {
    userName: 'user33azzz@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
]

To avoid mutating the original array, we can make a shallow copy using the spread syntax. Then, we can use the Array.filter() method to filter out objects with specific usernames.

const filteredCopy = [...original].filter(row => row['username'] !== 'user22abc');
console.log(filteredCopy);

In case we need to filter based on an array of usernames, some adjustments are needed. The custom function passed to filter() has two conditions:

1) Utilizing includes() to check if the username list contains the element's username. By negating this statement (using !), we get elements whose usernames are not in the usernameList array.

2) Checking if the first 4 characters of the username match the string user.

const original = [
  {
    username: 'user22abc@ngu',
    name: 'aaa',
    id: 'aaa1'
  },
  {
    username: 'user33azzz@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
  {
    username: 'user11@ngu',
    name: 'bbb',
    id: 'bbb1'
  },
  {
    username: 'bzzzz@ngu',
    name: 'bbab',
    id: 'bbb12'
  },
]

const usernameList = ['user22abc@ngu', 'user11@ngu'];

const filtering = usernameList => {
  const filteredCopy = [...original].filter(row => !usernameList.includes(row['username']) && row['username'].substring(0,4) === 'user');
  return filteredCopy;
}

filtering(usernameList);

Note that .includes() is part of ES7 and may not be supported by older browsers like Internet Explorer.

Answer 3

Answer №2

Give this a shot

this.modifiedArray = new Array();
for(const item of this.currentArray) {
 if(item.username !== 'user22abc@ngul')
  this.modifiedArray.push(item.username)
}

Answer 4

Give this a shot

this.modifiedArray = new Array();
for(const item of this.currentArray) {
 if(item.username !== 'user22abc@ngul')
  this.modifiedArray.push(item.username)
}

Answer 5

Answer №3

It appears that you are trying to eliminate certain objects from an array based on a specific condition related to the userName key. One way to achieve this is by using filters, as demonstrated in the code snippet below:

this.newArray = this.oldArray.filter((item) => item.userName !== 'user22abc@ngul')

Essentially, the above code will remove all objects from the array where the userName is not equal to user22abc@ngul. Hopefully, this explanation clarifies things for you.

Answer 6

It appears that you are trying to eliminate certain objects from an array based on a specific condition related to the userName key. One way to achieve this is by using filters, as demonstrated in the code snippet below:

this.newArray = this.oldArray.filter((item) => item.userName !== 'user22abc@ngul')

Essentially, the above code will remove all objects from the array where the userName is not equal to user22abc@ngul. Hopefully, this explanation clarifies things for you.

Is there a way to selectively filter and display certain data in an Angular data table?

Answer №1

Answer №2

Answer №3

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