asp net validation to make sure textbox has integer values

Question

I have a required validation setup on a textbox  but I also have to make sure it is an integer   How can I do this

User · Answer

http   msdn microsoft com en-us library ad548tzy 28VS 71 29 aspx When using Server validator controls you have to be careful about fact that any one can disable javascript in their browser  So you should use Page IsValid Property always at server side

User · Answer

You can use java script  for this -   lt asp TextBox ID  textbox1  runat  server  Width  150px  MaxLength  8  onkeypress  if event keyCode lt 48    event keyCode gt 57 event returnValue false   gt  lt  asp TextBox gt

User · Answer

simpally add this code     lt asp FilteredTextBoxExtender ID  txtAltitudeMin FilteredTextBoxExtender  runat  server  Enabled  True  TargetControlID  txtAltitudeMin  FilterType  Numbers  gt  lt  asp FilteredTextBoxExtender gt

User · Answer

lt script language  javascript  type  text javascript  gt          function fixedlength textboxID  keyEvent  maxlength                  validation for digits upto  maxlength  defined by caller function             if  textboxID value length  gt  maxlength                    textboxID value   textboxID value substr 0  maxlength                             else if  textboxID value length  lt  maxlength    textboxID value length    maxlength                    textboxID value   textboxID value replace     d   g                       return true                            else                 return false              lt  script gt    lt asp TextBox ID  txtNextVisit  runat  server  MaxLength  2  onblur  return fixedlength this  event  2    onkeypress  return fixedlength this  event  2    onkeyup  return fixedlength this  event  2    gt  lt  asp TextBox gt

User · Answer

This works fine to me    lt asp RegularExpressionValidator ID  RegularExpressionValidator1  runat  server       ControlToValidate  YourTextBoxID       ErrorMessage  Only numeric allowed   ForeColor  Red       ValidationExpression    0-9     ValidationGroup  NumericValidate  gt    lt  asp RegularExpressionValidator gt    I think you should add ValidationGroup  NumericValidate  to your submit button also

User · Answer

Double click your button and use the following code  -   protected void button click object sender EventArgs e     int parsedValue   if int TryParse  txt Text out parsedValue       Label Text    Please specify a number only        Will put a text in a label so make            sure                     you have a label     else            do what you want to

User · Answer

If all that you are concerned about is that the field contains an integer  i e   not concerned with a range   then add a CompareValidator with it s Operator property set to DataTypeCheck    lt asp CompareValidator runat  server  Operator  DataTypeCheck  Type  Integer    ControlToValidate  ValueTextBox  ErrorMessage  Value must be a whole number    gt    If there is a specific range of values that are valid  there probably are   then you can use a RangeValidator  like so    lt asp RangeValidator runat  server  Type  Integer   MinimumValue  0  MaximumValue  400  ControlToValidate  ValueTextBox   ErrorMessage  Value must be a whole number between 0 and 400    gt    These will only validate if there is text in the TextBox  so you will need to keep the RequiredFieldValidator there  too   As  Mahin said  make sure you check the Page IsValid property on the server side  otherwise the validator only works for users with JavaScript enabled

User · Answer

Visual Studio has got now integrated support for range checking and type checking  -    Try this  - For RANGE CHECKING Before validating checking for a particular range of numbers Switch on to design view from markup view  Then  -       View Toolbox Validation   Now Drag on RangeValidator to your design page where you want to show the error message ofcourse if user is inputting out of range value  now click on your RangeValidator control   Right click and select properties   In the Properties window  It is usually opened below solution bar  select on ERROR MESSAGE   Write  -        Number must be in range    Now select on Control to validate and select your TextboxID  or write it anyways  from the drop down Locate Type in the property bar itself and select down Integer  Just above it you will find maximum and minimum value  Type in your desired number      For Type checking  without any Range  Before validating checking for a particular range of numbers Switch on to design view from markup view  Then  -       View Toolbox Validation   Now Drag on CompareValidator to your design page where you want to show the error message ofcourse if user is inputting some text in it   now click on your CompareValidator control   Right click and select properties   In the Properties window  It is usually opened below solution bar  select on ERROR MESSAGE   Write -       Value must be a number     Now locate ControltoValidate option and write your controlID name in it alternatively you can also select from drop down  Locate the Operator option and write DataTypeCheck alternatively you can also select from drop down in it  Again locate the Type option and write Integer in it       That s sit   Alternatively you can write the following code in your aspx page  -   lt  --to validate without any range--

User · Answer

There are several different ways you can handle this   You could add a RequiredFieldValidator as well as a RangeValidator  if that works for your case  or you could add a CustomFieldValidator   Link to the CustomFieldValidator  http   msdn microsoft com en-us library system web ui webcontrols customvalidator 28VS 71 29 aspx  Link to MSDN Article on ASP NET Validation  http   msdn microsoft com en-us library aa479045 aspx

User · Answer

Attach a Regular Expression Validator to the text box and make its expression be this     d     And do your server side validation too  of course

User · Answer

Use Int32 TryParse    int integer   Int32 TryParse Textbox Text  out integer    It will return a bool so you can see if they entered a valid integer

[asp.net] asp.net validation to make sure textbox has integer values

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