how to display a hidden button after document.write('')?-CodePudding

I'm exploring a mixture of codes in javascript, HTML, CSS, and bootstrap. I tried to clear a page through a button click--> document.write(''), then kinda tried to repaint another button. Kindly explain where I've gone wrong, if this is a good practice or not. Sorry, if this is silly. On clicking button one, two things happen: 1) Page is cleared 2) The visibility property of the second button is changed by changing its class name (invoking the new class name's style property)

<style type="text/css">
.bn{visibility:hidden;}
.btn{visibility:visible;}
</style>
<script type="text/javascript">
function newpg(){
            document.write('');
            document.getElementById('two').className="btn";}
</script>
</head><body>
<div class="container">
<div class="row">
<div class="col-md-6">    <!--some content-->
<button id="one" onclick="newpg()">CLEAR &SHOW THE HIDDEN BUTTON</button>
<button class="bn" id="two">I'M HERE</button>
</div></div></div>   <!--bootstrap code inclusion-->
</body></html>

CodePudding user response：

As stated in my comment display none removes all the content of the page. You then try to find a button you just removed. It is not going to work.

You need to hide the element with JavaScript. You can easily do that by setting the display property.

Since you are using bootstrap, you should be toggling their classes. Either you toggle d-none or invisible

const btn1 = document.getElementById('one');
const btn2 = document.getElementById('two');
function newpg(evt) {
  evt.preventDefault();
  btn1.classList.add('d-none');
  btn2.classList.remove('d-none');
}
btn1.addEventListener("click", newpg);

<!-- CSS only -->
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<div class="container">
  <div class="row">
    <div class="col-md-6">
      <!--some content-->
      <button id="one">CLEAR &SHOW THE HIDDEN BUTTON</button>
      <button class="d-none" id="two">I'M HERE</button>
    </div>
  </div>
</div>

Bootstrap 3

const btn1 = document.getElementById('one');
const btn2 = document.getElementById('two');
function newpg(evt) {
  evt.preventDefault();
  btn1.classList.add('hidden');
  btn2.classList.remove('hidden');
}
btn1.addEventListener("click", newpg);

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">

<div class="container">
  <div class="row">
    <div class="col-md-6">
      <!--some content-->
      <button id="one">CLEAR &SHOW THE HIDDEN BUTTON</button>
      <button class="hidden" id="two">I'M HERE</button>
    </div>
  </div>
</div>

CodePudding user response：

Using document.write('') you're actually deleting every HTML element on your page, So there remains no element to be shown next. You should use another function to just eliminate the button with id one instead of deleting everything. I suggest document.getElementById('one').style.display="none". So the code would be something like this:

<style type="text/css">
    .bn{visibility:hidden;}
    .btn{visibility:visible;}
</style>
<script type="text/javascript">
    function newpg() {
            document.getElementById('one').style.display="none";
            document.getElementById('two').className="btn";
    }
</script>
</head>
<body>
    <div class="container">
    <div class="row">
    <div class="col-md-6">    <!--some content-->
        <button id="one" onclick="newpg()">
            CLEAR &SHOW THE HIDDEN BUTTON
        </button>
        <button class="bn" id="two">I'M HERE</button>
    </div></div></div>   <!--bootstrap code inclusion-->
</body>

CodePudding user response：

I'm not sure what you are trying to do by clearing the whole page, but it's probably not doing what you think it's doing.

document.write(''); // this indeed clear the whole HTML page
document.getElementById('two') // #two doesn't exist anymore since the page is now blank

Maybe you just want to display/hide elements? Then I would suggest using the CSS display property.