How to mark check box as a checked in angular 4

I am very new in angular 2. i need to mark check box on a button click.
i have some checkbox in a loop like

 <tr *ngFor="let roleObj of roleNameList">

      <td>

         <input type="checkbox"   id ={{roleObj.roleID}} />

     </td>

     <td>{{roleObj.roleName}}</td>

  </tr>

i have one array of selected role, only i need to mark those check boxes on a edit button click . so what i did like same in javascript

 document.getElementById("role").checked

but in angular 4 there is no property like that.

i searched and found there is one property binding for

[checked] ="somevariable"

but the problem is same property [checked] ="somevariable" will add on all checkboxes. the result is when i assigned the somevariable as true. it will mark all the checkboxes.

other solution I have in jquery like

$(document.getElementById(role)).prop('checked', true);

but might be it can create problem, i am not sure please correct me.

please help me. any clue or logic will same my days.

asked Apr 18 at 16:20

user3364549

12217

1

Make sameVariable a property of roleObj, and only update the relevant ones
– bugs
Apr 18 at 16:23

add a comment |

I am very new in angular 2. i need to mark check box on a button click.
i have some checkbox in a loop like

 <tr *ngFor="let roleObj of roleNameList">

      <td>

         <input type="checkbox"   id ={{roleObj.roleID}} />

     </td>

     <td>{{roleObj.roleName}}</td>

  </tr>

i have one array of selected role, only i need to mark those check boxes on a edit button click . so what i did like same in javascript

 document.getElementById("role").checked

but in angular 4 there is no property like that.

i searched and found there is one property binding for

[checked] ="somevariable"

but the problem is same property [checked] ="somevariable" will add on all checkboxes. the result is when i assigned the somevariable as true. it will mark all the checkboxes.

other solution I have in jquery like

$(document.getElementById(role)).prop('checked', true);

but might be it can create problem, i am not sure please correct me.

please help me. any clue or logic will same my days.

asked Apr 18 at 16:20

user3364549

12217

1

Make sameVariable a property of roleObj, and only update the relevant ones
– bugs
Apr 18 at 16:23

add a comment |

I am very new in angular 2. i need to mark check box on a button click.
i have some checkbox in a loop like

 <tr *ngFor="let roleObj of roleNameList">

      <td>

         <input type="checkbox"   id ={{roleObj.roleID}} />

     </td>

     <td>{{roleObj.roleName}}</td>

  </tr>

i have one array of selected role, only i need to mark those check boxes on a edit button click . so what i did like same in javascript

 document.getElementById("role").checked

but in angular 4 there is no property like that.

i searched and found there is one property binding for

[checked] ="somevariable"

but the problem is same property [checked] ="somevariable" will add on all checkboxes. the result is when i assigned the somevariable as true. it will mark all the checkboxes.

other solution I have in jquery like

$(document.getElementById(role)).prop('checked', true);

but might be it can create problem, i am not sure please correct me.

please help me. any clue or logic will same my days.

asked Apr 18 at 16:20

user3364549

12217

I am very new in angular 2. i need to mark check box on a button click.
i have some checkbox in a loop like

 <tr *ngFor="let roleObj of roleNameList">

      <td>

         <input type="checkbox"   id ={{roleObj.roleID}} />

     </td>

     <td>{{roleObj.roleName}}</td>

  </tr>

i have one array of selected role, only i need to mark those check boxes on a edit button click . so what i did like same in javascript

 document.getElementById("role").checked

but in angular 4 there is no property like that.

i searched and found there is one property binding for

[checked] ="somevariable"

but the problem is same property [checked] ="somevariable" will add on all checkboxes. the result is when i assigned the somevariable as true. it will mark all the checkboxes.

other solution I have in jquery like

$(document.getElementById(role)).prop('checked', true);

but might be it can create problem, i am not sure please correct me.

please help me. any clue or logic will same my days.

angular angular4-forms

asked Apr 18 at 16:20

user3364549

12217

asked Apr 18 at 16:20

user3364549

12217

asked Apr 18 at 16:20

user3364549

12217

asked Apr 18 at 16:20

user3364549

12217

asked Apr 18 at 16:20

user3364549

12217

1

Make sameVariable a property of roleObj, and only update the relevant ones
– bugs
Apr 18 at 16:23

add a comment |

1

Make sameVariable a property of roleObj, and only update the relevant ones
– bugs
Apr 18 at 16:23

Make sameVariable a property of roleObj, and only update the relevant ones
– bugs
Apr 18 at 16:23

add a comment |

3 Answers
3

active

oldest

votes

You can modify your object to also include a boolean checked property (i.e. roleObj.checked = false) and dynamically update the relevant ones when you need to.

Then you markup simply becomes

<input type="checkbox" [checked]="roleObj.checked" id ={{roleObj.roleID}} />

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

add a comment |

You can follow this simple implementation

import { Component } from '@angular/core';



@Component({

  selector: 'my-app',

  template: `

  <ng-container *ngFor="let item of items">

    <input type="checkbox" 

    [checked]="selected === item.id " 

    [value]="item.id" 

    (change)="selected = item.id"

    [attr.id]="item.id"

    /> 

   <label [attr.for]="item.id"> {{ item.label }}</label>

  </ng-container>



  `,

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  items = [

    { id: 1, label: 'one' },

    { id: 2, label: 'two' },

    { id: 3, label: 'three' }

  ];



  selected = 1;

}

Live demo

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

add a comment |

You should use variable. In your .ts:

public checkboxValue: boolean;

constructor() {

  this.checkboxValue = false;

}

And in your .html:

 <input type="checkbox" [(ngModel)]="checkboxValue"/>

You should remember to add FormModule in your @NgModule:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

    imports: [

         FormsModule      

    ]

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

You can modify your object to also include a boolean checked property (i.e. roleObj.checked = false) and dynamically update the relevant ones when you need to.

Then you markup simply becomes

<input type="checkbox" [checked]="roleObj.checked" id ={{roleObj.roleID}} />

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

add a comment |

You can modify your object to also include a boolean checked property (i.e. roleObj.checked = false) and dynamically update the relevant ones when you need to.

Then you markup simply becomes

<input type="checkbox" [checked]="roleObj.checked" id ={{roleObj.roleID}} />

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

add a comment |

You can modify your object to also include a boolean checked property (i.e. roleObj.checked = false) and dynamically update the relevant ones when you need to.

Then you markup simply becomes

<input type="checkbox" [checked]="roleObj.checked" id ={{roleObj.roleID}} />

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

You can modify your object to also include a boolean checked property (i.e. roleObj.checked = false) and dynamically update the relevant ones when you need to.

Then you markup simply becomes

<input type="checkbox" [checked]="roleObj.checked" id ={{roleObj.roleID}} />

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

edited Nov 10 at 23:51

answered Apr 18 at 16:26

bugs

4,9665723

answered Apr 18 at 16:26

bugs

4,9665723

answered Apr 18 at 16:26

bugs

4,9665723

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

add a comment |

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

thanks for your reply. i got you logic but could you please correct me why we should not use jquery logic
– user3364549
Apr 19 at 5:37

Well, given that you are building an Angular application, I would try to keep it as clean and angular-y as possible. Everything you can do with jQuery, you can do with standard Angular logic (pretty much) so I would try not to mix the two. The Angular version is also usually much cleaner, readable and reusable than a jQuery alternative
– bugs
Apr 19 at 7:13

add a comment |

You can follow this simple implementation

import { Component } from '@angular/core';



@Component({

  selector: 'my-app',

  template: `

  <ng-container *ngFor="let item of items">

    <input type="checkbox" 

    [checked]="selected === item.id " 

    [value]="item.id" 

    (change)="selected = item.id"

    [attr.id]="item.id"

    /> 

   <label [attr.for]="item.id"> {{ item.label }}</label>

  </ng-container>



  `,

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  items = [

    { id: 1, label: 'one' },

    { id: 2, label: 'two' },

    { id: 3, label: 'three' }

  ];



  selected = 1;

}

Live demo

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

add a comment |

You can follow this simple implementation

import { Component } from '@angular/core';



@Component({

  selector: 'my-app',

  template: `

  <ng-container *ngFor="let item of items">

    <input type="checkbox" 

    [checked]="selected === item.id " 

    [value]="item.id" 

    (change)="selected = item.id"

    [attr.id]="item.id"

    /> 

   <label [attr.for]="item.id"> {{ item.label }}</label>

  </ng-container>



  `,

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  items = [

    { id: 1, label: 'one' },

    { id: 2, label: 'two' },

    { id: 3, label: 'three' }

  ];



  selected = 1;

}

Live demo

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

add a comment |

You can follow this simple implementation

import { Component } from '@angular/core';



@Component({

  selector: 'my-app',

  template: `

  <ng-container *ngFor="let item of items">

    <input type="checkbox" 

    [checked]="selected === item.id " 

    [value]="item.id" 

    (change)="selected = item.id"

    [attr.id]="item.id"

    /> 

   <label [attr.for]="item.id"> {{ item.label }}</label>

  </ng-container>



  `,

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  items = [

    { id: 1, label: 'one' },

    { id: 2, label: 'two' },

    { id: 3, label: 'three' }

  ];



  selected = 1;

}

Live demo

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

You can follow this simple implementation

import { Component } from '@angular/core';



@Component({

  selector: 'my-app',

  template: `

  <ng-container *ngFor="let item of items">

    <input type="checkbox" 

    [checked]="selected === item.id " 

    [value]="item.id" 

    (change)="selected = item.id"

    [attr.id]="item.id"

    /> 

   <label [attr.for]="item.id"> {{ item.label }}</label>

  </ng-container>



  `,

  styleUrls: ['./app.component.css']

})

export class AppComponent {

  items = [

    { id: 1, label: 'one' },

    { id: 2, label: 'two' },

    { id: 3, label: 'three' }

  ];



  selected = 1;

}

Live demo

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

answered Apr 18 at 16:28

Tomasz Kula

6,5591331

add a comment |

You should use variable. In your .ts:

public checkboxValue: boolean;

constructor() {

  this.checkboxValue = false;

}

And in your .html:

 <input type="checkbox" [(ngModel)]="checkboxValue"/>

You should remember to add FormModule in your @NgModule:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

    imports: [

         FormsModule      

    ]

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

add a comment |

You should use variable. In your .ts:

public checkboxValue: boolean;

constructor() {

  this.checkboxValue = false;

}

And in your .html:

 <input type="checkbox" [(ngModel)]="checkboxValue"/>

You should remember to add FormModule in your @NgModule:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

    imports: [

         FormsModule      

    ]

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

add a comment |

You should use variable. In your .ts:

public checkboxValue: boolean;

constructor() {

  this.checkboxValue = false;

}

And in your .html:

 <input type="checkbox" [(ngModel)]="checkboxValue"/>

You should remember to add FormModule in your @NgModule:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

    imports: [

         FormsModule      

    ]

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

You should use variable. In your .ts:

public checkboxValue: boolean;

constructor() {

  this.checkboxValue = false;

}

And in your .html:

 <input type="checkbox" [(ngModel)]="checkboxValue"/>

You should remember to add FormModule in your @NgModule:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

    imports: [

         FormsModule      

    ]

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

edited Apr 18 at 16:54

Zach Newburgh

35729

edited Apr 18 at 16:54

Zach Newburgh

35729

edited Apr 18 at 16:54

Zach Newburgh

35729

answered Apr 18 at 16:23

kris_IV

484521

answered Apr 18 at 16:23

kris_IV

484521

answered Apr 18 at 16:23

kris_IV

484521

add a comment |

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