Error please enter only numbers 0-9 nghĩa là gì

In this article, we are going to learn how can we force the Input field to enter numbers only using JavaScript.

These are the following approaches that will explain how to force input field force numbers:

By using ASCII Value:

• In this approach, we are going to use ASCII code for taking numeric values from the input fields.
• We will check if the given input value does not lie between the numeric ASCII code then we will not accept that value.
• If the value lie between those numeric ASCII value then we will accept the input value.

Example : This example is the implementation of the above-explained approach.

HTML

< html lang = "en" >

< head >

<`0< <2 <3= <5>`

<`0< <2 `html`0=` `html`2

html`3`html`4= `html`6>`

<`0< `lang`0>`

`lang`2`lang`3

`lang`4`lang`5

`lang`4`lang`7

`lang`4`lang`9

lang`4=`1

lang`4=`3

lang`4=`5

lang`2=`7

<`0=9`lang`0>`

=`9`head >

< "en"`6>`

<`0< >0>`

lang`2< >4 `lang`0= >7>`

lang`4<`0

lang`2=9>4>`

lang`2< <7>`

`lang`4`head`0

lang`2=9<7>`

<`0=9>0>`

<`0< >1 >2= >4>`

lang`2< >8 `html`0= <01 <02= <04>`

lang`4< <08<09<08>`

lang`4< <14 <15= <17 <`18

lang`4<20<21= <23 <24= <26 <`27

lang`4< <30>`

lang`4< <30>`

lang`4< <08<39<08>`

lang`4< <14 <15= <47 <24= <26 <`18

lang`4<`53

lang`4< <30>`

lang`4< <30>`

lang`4< >0>`

<`66< <08<69<08>`

<`66< <14 <15= <`77

<`78<79= <`81

<`78<83= <85 <`27

<`66< <14 <15= <`92

<`78<94= <`96

<`78<98= `html`00>`

lang`4=9>0>`

lang`2=9>8>`

<`0=9>1>`

<`0< `html`16>`

`lang`2`html`19

`lang`4`html`21

lang`2=`7

`lang`2`html`25

`lang`4`html`27

`lang`4`html`29

`lang`4`html`31`html`32 `html`33

`<`66`html`35

`lang`4`html`37

lang`2=`7

<`0=9`html`16>`

=`9"en"6>`

=`9`html >

Output:

By using replace(), isNan() function:

• In this approach, we are taking input from input from input filed having type text.
• On submission we are chechking whether the value is valid a valid number or not and rendering response accrodingly.
• Also, we are replacing the given value by reducing it to only numeric value.

Example : This example is the implementation of the above-explained approach.

HTML

< html lang = "en" >

< head >

<`0< <2 <3= <5>`

<`0< <2 `html`0=` `html`2

html`3`html`4= `html`6>`

<`0< `html`16 `html`81=`

<`0=9`html`16>`

=`9`head >

< "en"`6>`

<`0< >0>`

lang`2< >4 `lang`0= >7>`

lang`4`lang`05>4>`

lang`2< <7>`

`lang`4`lang`13

`lang`4`lang`15

lang`2=9<7>`

lang`2< <30>`

lang`2< >8 <02= <04 `lang`30= `lang`32>`

lang`4< <08`lang`37<08>`

lang`4< <14 <15= <17 `html`0=` `lang`48

lang`49<21= `lang`52>`

lang`4< <30>`

lang`4< <30>`

lang`4< <08`lang`65<08>`

lang`4< <14 <15= <17 `html`0= `lang`76 `lang`30=` `lang`79

lang`49`lang`81= `lang`83 `lang`84= `lang`86>`

lang`2=9>8>`

<`0=9>0>`

<`0< `html`16>`

lang`2=`01

lang`4=`03

<`66=`05

lang`4=`07

lang`2=`07

lang`2=`11

lang`4=`13

lang`4=`15

lang`4=`17

lang`4=`19

lang`4=`21

<`66=`23

=`24=`25

=`24=`27

=`24=`29

=`24=`31

`=`24`html`35

<`66=`35

=`24=`37

<`66=`7

lang`4=`7

lang`2=`7

<`0=9`html`16>`

=`9"en"6>`

=`9`html >

Output:

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