javascript - undefined index while submitting the form -

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i want submit form empty checkbox want value "no" if checkbox not checked. 

if($domain_check=="yes") {     echo '<div class="col-md-3">             <div class="form-group" style="padding-top:20px;">                 domain_check   <input type="checkbox" name="domain_check1" value="yes" checked>             </div>          </div>'; } else {     echo '<div class="col-md-3">              <div class="form-group" style="padding-top:20px;">                 domain_check   <input type="checkbox" name="domain_check1" value="yes">              </div>           </div>'; }

use hidden input before checkbox set default value same name:

<input type="hidden" name="domain_check1" value="no"> <input type="checkbox" name="domain_check1" value="yes">

the hidden input overridden if checkbox checked.


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