Restrict zero at the first character only in angular 2+. (expected output- 10101)
0
How to restrict zero at the first character only in the input field (expected output is like 10101)?
This is my way of doing.
HTML markup:
<input type="text" class="form-control col-md-4" #check (keypress)="isInteger($event)">
Typescript .ts file:
@ViewChild("check") inputFileld:ElementRef;
isInteger(event)
{
if(event.key=='0' && !this.inputFileld.nativeElement.value)
{
return false
}
}
With this trick, I'm not able to enter zero at first character but the problem is, write some number in the input field and select all the value and press zero that time zero is triggering.
angular angular6 angular2-template
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
add a comment |
0
How to restrict zero at the first character only in the input field (expected output is like 10101)?
This is my way of doing.
HTML markup:
<input type="text" class="form-control col-md-4" #check (keypress)="isInteger($event)">
Typescript .ts file:
@ViewChild("check") inputFileld:ElementRef;
isInteger(event)
{
if(event.key=='0' && !this.inputFileld.nativeElement.value)
{
return false
}
}
With this trick, I'm not able to enter zero at first character but the problem is, write some number in the input field and select all the value and press zero that time zero is triggering.
angular angular6 angular2-template
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47
add a comment |
0
0
0
How to restrict zero at the first character only in the input field (expected output is like 10101)?
This is my way of doing.
HTML markup:
<input type="text" class="form-control col-md-4" #check (keypress)="isInteger($event)">
Typescript .ts file:
@ViewChild("check") inputFileld:ElementRef;
isInteger(event)
{
if(event.key=='0' && !this.inputFileld.nativeElement.value)
{
return false
}
}
With this trick, I'm not able to enter zero at first character but the problem is, write some number in the input field and select all the value and press zero that time zero is triggering.
angular angular6 angular2-template
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
How to restrict zero at the first character only in the input field (expected output is like 10101)?
This is my way of doing.
HTML markup:
<input type="text" class="form-control col-md-4" #check (keypress)="isInteger($event)">
Typescript .ts file:
@ViewChild("check") inputFileld:ElementRef;
isInteger(event)
{
if(event.key=='0' && !this.inputFileld.nativeElement.value)
{
return false
}
}
With this trick, I'm not able to enter zero at first character but the problem is, write some number in the input field and select all the value and press zero that time zero is triggering.
angular angular6 angular2-template
angular angular6 angular2-template
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
edited Nov 22 '18 at 19:09
marc_s
574k12811091256
574k12811091256
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
asked Nov 22 '18 at 18:40
ranjan kumar rairanjan kumar rai
32
32
Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47
add a comment |
Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47
Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47
Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47
add a comment |
1 Answer
1
active
oldest
votes
0
HTML
<div>
<input type="text" class="form-control col-md-4" #check id="myText" (keypress)="isInteger($event)">
</div>
TS
isInteger(event) {
var ctl = document.getElementById('myText');
var startPos = ctl['selectionStart'];
if (startPos == 0 && String.fromCharCode(event.which) == '0') {
return false
}
}
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
HTML
<div>
<input type="text" class="form-control col-md-4" #check id="myText" (keypress)="isInteger($event)">
</div>
TS
isInteger(event) {
var ctl = document.getElementById('myText');
var startPos = ctl['selectionStart'];
if (startPos == 0 && String.fromCharCode(event.which) == '0') {
return false
}
}
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
add a comment |
0
HTML
<div>
<input type="text" class="form-control col-md-4" #check id="myText" (keypress)="isInteger($event)">
</div>
TS
isInteger(event) {
var ctl = document.getElementById('myText');
var startPos = ctl['selectionStart'];
if (startPos == 0 && String.fromCharCode(event.which) == '0') {
return false
}
}
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
add a comment |
0
0
0
HTML
<div>
<input type="text" class="form-control col-md-4" #check id="myText" (keypress)="isInteger($event)">
</div>
TS
isInteger(event) {
var ctl = document.getElementById('myText');
var startPos = ctl['selectionStart'];
if (startPos == 0 && String.fromCharCode(event.which) == '0') {
return false
}
}
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
HTML
<div>
<input type="text" class="form-control col-md-4" #check id="myText" (keypress)="isInteger($event)">
</div>
TS
isInteger(event) {
var ctl = document.getElementById('myText');
var startPos = ctl['selectionStart'];
if (startPos == 0 && String.fromCharCode(event.which) == '0') {
return false
}
}
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
answered Nov 22 '18 at 23:20
Rak2018Rak2018
540112
540112
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
add a comment |
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
Thanks for the help.
– ranjan kumar rai
Nov 23 '18 at 16:54
add a comment |
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Change the type to number and use pattern w3schools.com/tags/att_input_pattern.asp to limit the character via regex? Try that.
– rrd
Nov 22 '18 at 18:47