javascript - How to disable a button at an empty text/number field -


i wish disable button in html on condition required fields empty. code given below of form in button there:

<form>    name*: <input type="text" size="20" name="name" /> <br /><br /> surname: <input type="text" size="20" name="sur_name" /> <br />    <br /><br /> mobile number: <input type="tel" size="15" name="mob" /> <br /><br /> e-mail id*: <input type="email" size="30" name="user_id" /> <br /><br /> password*: <input type="password" size="30" name="pw1" /> <br /><br /> confirm password*: <input      type="password" size="30" name="pw2" /> <br /><br /><br /><br /> accept terms , conditions <input type="checkbox" name="t&c" /><br /><br />      <input type="submit" class="btn btn-lg btn-primary" value="sign now" onclick=window.location.href="https://www.google.co.in/signup" />  </form>

the form dummy sign screen, yet screen redirected 404 error screen, want button disabled if fields empty, , reloads page if 2 values password different.

i don't know js completely, please edit code parameters clear.

replace <input type="text" size="20" name="name" /> <input type="text" size="20" name="name" required/>

replace <input type="email" size="30" name="user_id" /> <input type="email" size="30" name="user_id" required/>

replace <input type="password" size="30" name="pw1" /> <input type="password" size="30" name="pw1" required/>

replace <input type="password" size="30" name="pw2" /> <input type="password" size="30" name="pw2" required/>


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