Asp.net textbox can only enter numbers

<Asp: textbox id = "textbox1" onkeyup = "If (isnan (value) Execcommand ('undo ')" runat = "server"

Width = "80px" onafterpaste = "If (isnan (value) Execcommand ('undo ')"> </ASP: textbox>

In fact, the server control can also add events such as onkeydown and up.

In this way, only decimals and numbers can be entered.

 

In. NET development, to ensure data correctness, users often need to input content for verification. In the analogy, only numbers can be entered.

First, add a property event to the Textbox Control:

<Asp: textbox class = "text"

Onkeypress = "If (event. keycode <48 | event. keycode> 57) event. returnvalue = false ;"

Id = "txty_revenue" style = "text-align: Right" runat = "server" width = "90%" maxlength = "12">

</ASP: textbox>

When the keyboard is pressed, check whether the press is 0-9. If not, do not put the current input into the text box.

Note: This method controls textbox to only input numbers: 0 ~ 9. Provide an idea

Supplement:

1. The dotted box when the cancel button is pressed

 

Add the attribute value hidefocus or hidefocus = true in input.

2. Read-only text box content

 

Add the attribute value readonly in input.

3. Prevent text files from being cleared (style content can be referenced as a class)

 

<Input style = behavior: URL (# default # savehistory); type = text id = opersistinput>

4. Press enter to move the cursor to the next input box.

<Input onkeydown = "If (event. keycode = 13) event. keycode = 9">

5. It can only be Chinese (with flashing)

<Input onkeyup = "value = value. Replace (/[-~] /G, '')" onkeydown = "If (event. keycode = 13) event. keycode = 9"> use the ASCII code range to determine

6. Only numbers are allowed (with flashing)

<Input onkeyup = "value = value. replace (/[^ \ D]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g, '')"> use the ASCII code range to determine

7. Only numbers are allowed (no flashing)

<Input style = "ime-mode: Disabled" onkeydown = "If (event. keycode = 13) event. keycode = 9 "onkeypress =" If (event. keycode <48 | event. keycode> 57) event. returnvalue = false "> use the ASCII code range to determine

8. Only English and numbers can be entered (with flashing)

 

<Input onkeyup = "value = value. replace (/[\ W]/g, '')" onbeforepaste = "clipboardData. setdata ('text', clipboardData. getdata ('text '). replace (/[^ \ D]/g, '')"> use the regular expression of JavaScript for verification.

9. shielded Input Method

<Input type = "text" name = "url" style = "ime-mode: Disabled" onkeydown = "If (event. keycode = 13) event. keycode = 9">

10. You can only enter numbers, decimal points, minus (-) characters (no flashing)

<Input onkeypress = "If (event. keycode! = 46 & event. keycode! = 45 & (event. keycode <48 | event. keycode> 57) event. returnvalue = false "> use the ASCII code range to determine

11. Only two decimal places can be entered, and three decimal places (with flashing)

<Input maxlength = 9 onkeyup = "If (value. match (/^ \ D {3} $/) value = value. replace (value, parseint (value/10); value = value. replace (/\. \ D *\. /g ,'. ') "onkeypress =" If (event. keycode <48 | event. keycode> 57) & event. keycode! = 46 & event. keycode! = 45
| Value. match (/^ \ D {3 }$/) | /\. \ D {3} $ /. test (value) {event. returnvalue = false} "id = text_kfxe name = text_kfxe> use the regular expression of Js for verification.

 

In fact, in applications, do not restrict user input. You only need to verify user input, because this restriction often leads to poor user experience.