My html is:
<input type="text" name="username">
If we write any validation also ,i need the function related stuff to happen in typescript but not java script.
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You mean :`` – soorapadman Jun 01 '17 at 11:24
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Check this :https://stackoverflow.com/questions/39236992/how-to-validate-white-spaces-empty-spaces-angular-2 – soorapadman Jun 01 '17 at 11:28
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Yeah i have to apply pattern.Correct.But what if I have to apply to say many text fields that too in different page .Is there a way to apply a pattern to all the text fields once at a time? – shinchan Jun 01 '17 at 11:30
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not possible with HTML but you can go with custom validator in typescript – soorapadman Jun 01 '17 at 11:32
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Yes I wanted those validators written in typescript.Can you please give me a code example in typescript? – shinchan Jun 01 '17 at 11:39
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The link which i share above has the solution what you are expecting. – soorapadman Jun 01 '17 at 11:48
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Possible duplicate of [How to validate white spaces/empty spaces? \[Angular 2\]](https://stackoverflow.com/questions/39236992/how-to-validate-white-spaces-empty-spaces-angular-2) – HaveSpacesuit Jul 17 '17 at 15:22
1 Answers
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The simplest way is to use Regex in whatever implementation you need to filter for leading/trailing whitespace. If you want simple validation, try the HTML5 pattern attribute.
^(?=[A-Za-z0-9])([A-Za-z0-9\s]*)(?<=[A-Za-z0-9])$
pablow
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