Question

I put some validation to check input data is valid or not. this checking is done by javascript. however, when I disabled my browser’s javascript that validation is not working.

Answer 1

Server side validation is the best option always. However if Server Side Validation is out of scope, you could leverage HTML5 Form validation.

HTML5 also offers validation of web addresses entered into fields, and numbers in fields. The
validation of numbers even takes into account the min and max
attributes, so browsers will not let you submit the form if you enter
a number that is too large.

If you don’t want to validate a Form using HTMl5 simple use novalidate atribute

<form novalidate>
  <input type="email" id="addr">
  <input type="submit" value="Subscribe">
</form>