how to make a dotted password visible for a second php code example

Example 1: how to make a show password button

function myFunction() {
  var x = document.getElementById("*passwordbox-id*");
  if (x.type === "password") {
    x.type = "text";
  } else {
    x.type = "password";
  }
}

Example 2: html show password

//Javascript show all password textboxes script by me
var k = document.getElementsByTagName('input')
for(i=0;i<k.length;i++){
    if(k[i].type = "password"){
        k[i].type = "text"
    }
}

Example 3: password visibility toggle

<div class="input-group">
  <input type="password" class="form-control pwd" id="login_password" placeholder="" name="password" required>
     <span class="input-group-btn" id="eyeSlash">
       <button class="btn btn-default reveal" onclick="visibility3()" type="button"><i class="fa fa-eye-slash" aria-hidden="true"></i></button>
     </span>
     <span class="input-group-btn" id="eyeShow" style="display: none;">
       <button class="btn btn-default reveal" onclick="visibility3()" type="button"><i class="fa fa-eye" aria-hidden="true"></i></button>
     </span>
  </div>


function visibility3() {
  var x = document.getElementById('login_password');
  if (x.type === 'password') {
    x.type = "text";
    $('#eyeShow').show();
    $('#eyeSlash').hide();
  }else {
    x.type = "password";
    $('#eyeShow').hide();
    $('#eyeSlash').show();
  }
}