disable an input if another input is clicked or checkbox is checked

I have three sections in a form, the first one contains one input and the second contains three inputs and the third contains a checkbox. I want to

1. disable the two sections if checkbox is checked


2. disable the checkbox and a section if I tapped a text in the other section


3. enable the three sections if all of them are empty

I must have only one active section everytime.

Thanks and sorry about my english

<link href="http://ift.tt/1FHelXo" rel="stylesheet"/>
<div class="row">
                                                                        <div class="col-md-4">
                                                                                <div class="row">
                                                                                        <div class="form-group col-md-12">
                                                                                                <label>Search Client</label>
                                                                                        </div>
                                                                                </div>
                                                                                <div class="row">
                                                                                        <div class="form-group col-md-12">
                                                                                                <div class="input-group custom-search-form margin-bottom">
                                                                                                        <input id="client_name_search" name="client_name_search" type="text" class="form-control input-sm" placeholder="Search...">
                                                                                                        <span class="input-group-btn">
                                                                                                                <button class="btn btn-default btn-sm" type="button">
                                                                                                                        <i class="fa fa-search"></i>
                                                                                                                </button>
                                                                                                        </span>
                                                                                                </div>
                                                                                        </div>
                                                                                </div>
                                                                        </div>
                                                                        <div class="col-md-8">
                                                                                <div class="row">
                                                                                        <div class="form-group col-md-12">
                                                                                                <label>New Client</label>
                                                                                        </div>
                                                                                </div>
                                                                                <div class="row">
                                                                                        <div class="form-group col-md-4">
                                                                                                <input type="text" class="form-control input-sm" id="FirstName" placeholder="First Name">
                                                                                        </div>
                                                                                        <div class="form-group col-md-4">
                                                                                                <input type="text" class="form-control input-sm" id="LastName" placeholder="Last Name">
                                                                                        </div>
                                                                                        <div class="form-group col-md-4">
                                                                                                <input type="email" class="form-control input-sm" id="inputEmail" placeholder="Email">
                                                                                                
                                                                                        </div>
                                                                                </div>
                                                                        </div>
                                                                </div>
                                                                
                                                                <div class="checkbox margin-bottom">
                                                                        <label>
                                                                                <input id="standard" type="checkbox" value="">Standard
                                                                        </label>
                                                                </div>