bs4 class for input from server code example

Example 1: input with bootstrap

<form>
  <div class="form-group">
    <label for="exampleInputEmail1">Email address</label>
    <input type="email" class="form-control">
    <small id="emailHelp" class="form-text text-muted">Hello, World</small>
  </div>
 </form>

Example 2: check if form bootstrap is valid js

function form_validate(attr_id){
    var result = true;
    $('#'+attr_id).validator('validate');
    $('#'+attr_id+' .form-group').each(function(){
        if($(this).hasClass('has-error')){
            result = false;
            return false;
        }
    });
    return result;
}