How to prevent additional characters on input field when max length reached in angular app
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I am implementing a directive to stop the user from typing additional characters in the input field in my angular 6 apps. And to allow non-data input keys such as tab, del, backspace etc, and I have an if condition with event.which
export class MaxLengthDirective {
maxLength: number;
constructor(private el: ElementRef, private ngControl: NgControl) {}
@HostListener('keydown', ['$event'])
onKeyDown(event) {
const element = this.el.nativeElement;
if (element.value.length >= this.maxLength) {
if (event.which !== 8 && event.which !== 9 && event.which !== 46)
event.preventDefault();
}
}
}
But my if condition grows longer when I want to allow more keyboard inputs such ctrl+ C or back arrow or shift + tab etc
Is there a smarter way of handling this nondata inputs on my input control when length exceeds, so that i can still accept non data keys such as tab, del,back arrow etc
javascript html angular typescript
asked Nov 19 at 16:13
krishna
84
add a comment |
up vote
0
down vote
favorite
I am implementing a directive to stop the user from typing additional characters in the input field in my angular 6 apps. And to allow non-data input keys such as tab, del, backspace etc, and I have an if condition with event.which
export class MaxLengthDirective {
maxLength: number;
constructor(private el: ElementRef, private ngControl: NgControl) {}
@HostListener('keydown', ['$event'])
onKeyDown(event) {
const element = this.el.nativeElement;
if (element.value.length >= this.maxLength) {
if (event.which !== 8 && event.which !== 9 && event.which !== 46)
event.preventDefault();
}
}
}
But my if condition grows longer when I want to allow more keyboard inputs such ctrl+ C or back arrow or shift + tab etc
Is there a smarter way of handling this nondata inputs on my input control when length exceeds, so that i can still accept non data keys such as tab, del,back arrow etc
javascript html angular typescript
asked Nov 19 at 16:13
krishna
84
1
Is not a better approach for you tu usemaxlength="8"attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input
– fmontes
Nov 19 at 16:18
Have a look at thepipe. Even if this is not the perfect situation, is anyway a way to solve this problem
– Jacopo Sciampi
Nov 19 at 16:21
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am implementing a directive to stop the user from typing additional characters in the input field in my angular 6 apps. And to allow non-data input keys such as tab, del, backspace etc, and I have an if condition with event.which
export class MaxLengthDirective {
maxLength: number;
constructor(private el: ElementRef, private ngControl: NgControl) {}
@HostListener('keydown', ['$event'])
onKeyDown(event) {
const element = this.el.nativeElement;
if (element.value.length >= this.maxLength) {
if (event.which !== 8 && event.which !== 9 && event.which !== 46)
event.preventDefault();
}
}
}
But my if condition grows longer when I want to allow more keyboard inputs such ctrl+ C or back arrow or shift + tab etc
Is there a smarter way of handling this nondata inputs on my input control when length exceeds, so that i can still accept non data keys such as tab, del,back arrow etc
javascript html angular typescript
asked Nov 19 at 16:13
krishna
84
I am implementing a directive to stop the user from typing additional characters in the input field in my angular 6 apps. And to allow non-data input keys such as tab, del, backspace etc, and I have an if condition with event.which
export class MaxLengthDirective {
maxLength: number;
constructor(private el: ElementRef, private ngControl: NgControl) {}
@HostListener('keydown', ['$event'])
onKeyDown(event) {
const element = this.el.nativeElement;
if (element.value.length >= this.maxLength) {
if (event.which !== 8 && event.which !== 9 && event.which !== 46)
event.preventDefault();
}
}
}
But my if condition grows longer when I want to allow more keyboard inputs such ctrl+ C or back arrow or shift + tab etc
Is there a smarter way of handling this nondata inputs on my input control when length exceeds, so that i can still accept non data keys such as tab, del,back arrow etc
javascript html angular typescript
javascript html angular typescript
asked Nov 19 at 16:13
krishna
84
asked Nov 19 at 16:13
krishna
84
asked Nov 19 at 16:13
krishna
84
asked Nov 19 at 16:13
krishna
84
asked Nov 19 at 16:13
krishna
84
84
1
Is not a better approach for you tu usemaxlength="8"attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input
– fmontes
Nov 19 at 16:18
Have a look at thepipe. Even if this is not the perfect situation, is anyway a way to solve this problem
– Jacopo Sciampi
Nov 19 at 16:21
add a comment |
1
Is not a better approach for you tu usemaxlength="8"attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input
– fmontes
Nov 19 at 16:18
Have a look at thepipe. Even if this is not the perfect situation, is anyway a way to solve this problem
– Jacopo Sciampi
Nov 19 at 16:21
1
1
Is not a better approach for you tu use
maxlength="8" attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input– fmontes
Nov 19 at 16:18
Is not a better approach for you tu use
maxlength="8" attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input– fmontes
Nov 19 at 16:18
Have a look at the
pipe. Even if this is not the perfect situation, is anyway a way to solve this problem– Jacopo Sciampi
Nov 19 at 16:21
Have a look at the
pipe. Even if this is not the perfect situation, is anyway a way to solve this problem– Jacopo Sciampi
Nov 19 at 16:21
add a comment |
1 Answer
1
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My non-pure angular proposition (allow only alphanumeric keys):
<input type="text" onkeydown="return /[a-z0-9]/i.test(event.key)" [attr.maxlength]="maxLength">
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
add a comment |
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1 Answer
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active
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
My non-pure angular proposition (allow only alphanumeric keys):
<input type="text" onkeydown="return /[a-z0-9]/i.test(event.key)" [attr.maxlength]="maxLength">
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
add a comment |
up vote
0
down vote
My non-pure angular proposition (allow only alphanumeric keys):
<input type="text" onkeydown="return /[a-z0-9]/i.test(event.key)" [attr.maxlength]="maxLength">
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
add a comment |
up vote
0
down vote
up vote
0
down vote
My non-pure angular proposition (allow only alphanumeric keys):
<input type="text" onkeydown="return /[a-z0-9]/i.test(event.key)" [attr.maxlength]="maxLength">
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
My non-pure angular proposition (allow only alphanumeric keys):
<input type="text" onkeydown="return /[a-z0-9]/i.test(event.key)" [attr.maxlength]="maxLength">
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
edited Nov 19 at 16:23
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
answered Nov 19 at 16:17
Kamil Kiełczewski
8,30575587
8,30575587
add a comment |
add a comment |
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1
Is not a better approach for you tu use
maxlength="8"attr of the input? developer.mozilla.org/en-US/docs/Web/HTML/Element/input– fmontes
Nov 19 at 16:18
Have a look at the
pipe. Even if this is not the perfect situation, is anyway a way to solve this problem– Jacopo Sciampi
Nov 19 at 16:21