Resizing text-areas automatically with Angular

Question

Resizing text-areas automatically with Angular

[![enter image description here][1]][1]I am trying to set a maximum height for a text area so that when the user keeps adding text, it will display a scroll bar once it reaches the limit. Currently, my implementation causes the modal to stretch too much when more text is added.

Is there a way to prevent the modal from stretching in this case? Thank you.

html

 <div fxLayout="row" fxLayoutAlign="start start" class="full-width question-text" fxLayoutGap="12px">
          <mat-form-field style="height: auto; overflow: hidden;" class="pr-4" appearance="outline">
            <mat-label>Comments</mat-label>
            <div
            style="
              margin-right: 10px;
              overflow-y: auto;
              height: auto;
              max-height: 200px;
            "
          >
          <textarea cdkTextareaAutosize
          matTextareaAutosize
          matInput
          formControlName="comment"
          [required]="isCommentRequired()"
        ></textarea>
          </div>

angular typescript mat-form-field

Answer 1

Answer №1

Place "overflow-y:scroll" in the textarea css to fix the issue. This is a CSS problem, not related to Angular. Additionally, make sure to eliminate any <code>overflow-y: auto

declarations from the parent div.

Answer 2

Place "overflow-y:scroll" in the textarea css to fix the issue. This is a CSS problem, not related to Angular. Additionally, make sure to eliminate any <code>overflow-y: auto

declarations from the parent div.

Answer 3

Answer №2

Have you experimented with the matAutosizeMinRows and matAutosizeMaxRows properties?

<textarea matInput
              matTextareaAutosize
              [matAutosizeMinRows]="min"
              [matAutosizeMaxRows]="max"></textarea>
  </mat-form-field>

Answer 4

Have you experimented with the matAutosizeMinRows and matAutosizeMaxRows properties?

<textarea matInput
              matTextareaAutosize
              [matAutosizeMinRows]="min"
              [matAutosizeMaxRows]="max"></textarea>
  </mat-form-field>

Answer 5

Answer №3

After browsing through the Angular Material (13.3.2) documentation, I stumbled upon this fascinating feature.

Here is an example of how to use it in a component:

import {CdkTextareaAutosize} from '@angular/cdk/text-field';
import {Component, NgZone, ViewChild} from '@angular/core';
import {take} from 'rxjs/operators';

@Component({
  selector: 'text-field-autosize-textarea-example',
  templateUrl: './text-field-autosize-textarea-example.html',
  styleUrls: ['./text-field-autosize-textarea-example.css'],
})
export class TextFieldAutosizeTextareaExample {
  constructor(private _ngZone: NgZone) {}

  @ViewChild('autosize') autosize: CdkTextareaAutosize;

  triggerResize() {
    // Wait for changes to be applied, then trigger textarea resize.
    this._ngZone.onStable.pipe(take(1)).subscribe(() => this.autosize.resizeToFitContent(true));
  }
}

And here is how you can implement it in your template:

<mat-form-field appearance="fill">
  <mat-label>Autosize textarea</mat-label>
  <textarea matInput
            cdkTextareaAutosize
            #autosize="cdkTextareaAutosize"
            cdkAutosizeMinRows="1"
            cdkAutosizeMaxRows="5"></textarea>
</mat-form-field>

Answer 6

After browsing through the Angular Material (13.3.2) documentation, I stumbled upon this fascinating feature.

Here is an example of how to use it in a component:

import {CdkTextareaAutosize} from '@angular/cdk/text-field';
import {Component, NgZone, ViewChild} from '@angular/core';
import {take} from 'rxjs/operators';

@Component({
  selector: 'text-field-autosize-textarea-example',
  templateUrl: './text-field-autosize-textarea-example.html',
  styleUrls: ['./text-field-autosize-textarea-example.css'],
})
export class TextFieldAutosizeTextareaExample {
  constructor(private _ngZone: NgZone) {}

  @ViewChild('autosize') autosize: CdkTextareaAutosize;

  triggerResize() {
    // Wait for changes to be applied, then trigger textarea resize.
    this._ngZone.onStable.pipe(take(1)).subscribe(() => this.autosize.resizeToFitContent(true));
  }
}

And here is how you can implement it in your template:

<mat-form-field appearance="fill">
  <mat-label>Autosize textarea</mat-label>
  <textarea matInput
            cdkTextareaAutosize
            #autosize="cdkTextareaAutosize"
            cdkAutosizeMinRows="1"
            cdkAutosizeMaxRows="5"></textarea>
</mat-form-field>

Answer 7

Answer №4

To dynamically adjust the number of rows in a textarea based on user input, utilize a text event listener such as onTextChanged.

<mat-form-field class="full-width" appearance="outline">
    <mat-label>{{label}}</mat-label>
    <textarea matInput type="text" class="form-control" value="{{ text }}" (input)="onTextChanged($event)" rows="{{numberOfRows}}"></textarea>
</mat-form-field>

In the event listener function, determine the number of new lines the user has added to update the numberOfRows variable.

function onTextChanged(event: Event) {
    numberOfRows = event.target.value.split('\n').length;
}

Next, specify the maximum height using CSS:

textarea {
    max-height: 300px;
}

Answer 8

To dynamically adjust the number of rows in a textarea based on user input, utilize a text event listener such as onTextChanged.

<mat-form-field class="full-width" appearance="outline">
    <mat-label>{{label}}</mat-label>
    <textarea matInput type="text" class="form-control" value="{{ text }}" (input)="onTextChanged($event)" rows="{{numberOfRows}}"></textarea>
</mat-form-field>

In the event listener function, determine the number of new lines the user has added to update the numberOfRows variable.

function onTextChanged(event: Event) {
    numberOfRows = event.target.value.split('\n').length;
}

Next, specify the maximum height using CSS:

textarea {
    max-height: 300px;
}

Resizing text-areas automatically with Angular

html

Answer №1

Answer №2

Answer №3

Answer №4

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