CODEWITHSUNDEEP
htmlcssformslabel
Chris Grim
Chris Grim

Reputation: 169

How to Add a Class to HTML when clicking on a field?

On this page https://www.startwithsquare1.com/signup/ When you click on any of the fields it adds "-top" to the "sq-input sq-input_light -inverse" class. Is there a way to add this without javascript? If I do have to use JS, how would I do it? I am trying to achieve how the label scales up when you click on the field.

Thanks!!

Upvotes: 0

Views: 2781

Answers (5)

Andrey Ponomarenko
Andrey Ponomarenko

Reputation: 119

I think such manipulations are bad practice. They are always feels like a crutch.

If you are dont want to waste your time on javascript, then try Elemental, it is pretty easy to use, and it's 3kb only.

Your page gives 503 error, so i will just try to make an example.

var element = document.querySelector('.element');
element.addEventListener('click', function () {
  Elemental.add(this, 'myNewCssClass');
})

It is easy to use, and it works fast

Upvotes: 0

GonzaloPani
GonzaloPani

Reputation: 170

You can easy do it with HTML and CSS code. This is called Floating Placeholder and you need to:

Here's the example and at the end of the answer is the link to a Video Tutorial if you have any more doubt, but the main thing is the class:focus .

body
{
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: url(college.png);
  background-repeat: no-repeat;
  background-size: cover;
}

.container
{
  position: absolute;
  top: 50%;
  left: 75%;
  transform: translate(-50%,-50%);
  width: 700px;
  background: #fff;
  padding: 45px;
  box-sizing: border-box;
  border :1px solid rgba(0,0,0,.1);
  box-shadow: 0 5px 10px rgba(0,0,0,.2);
}

.container h1
{
  text-align: center;
  margin: 0 0 40px;
  padding: 0;
  color: rgb(66,133,244);
  letter-spacing: 2px;
}

.container input
{
  padding: 5px;
  margin-bottom: 30px;
  width: 55%;
  box-sizing: border-box;
  box-shadow: none;
  outline: none;
  border:none;
  border-bottom: 2px solid #999;
}

.container input[type="submit"]
{
  border-radius: 25px;
  font-size: 20px;
  height: 40px;
  cursor : pointer;
  background: rgb(66,133,244);
  color: #fff;
  margin-bottom: 0;
}
.container input[type="submit"]:hover
{
  background: #34F458;
  color: #fff;
}

.container form div
{
  position: relative;
}
.container form div label
{
  position: absolute;
  top: 3px;
  pointer-events: none;
  left: 0;
  transition: .5s;
}

.container input:focus ~label,
.container input:valid ~label
{
  left: 0;
  top: -20px;
  color: rgb(66,133,244);
  font-size: 12px;
  font-weight: bold;
}
.container input:focus,
.container input:valid
{
  border-bottom: 2px solid rgb(66,133,244);
}
<html>
<body>
  <div class="container">
    <form>
      <div>
      <input type="email" name="" required="">
      <label>Email id</label>   
      </div>
      <div>
      <input type="password" name="" required="">
      <label>Password</label>   
      </div>
      <div>
      <input type="password" name="" required="">
      <label>Re-Enter Password</label>   
      </div>
    <input type="submit" value="Register" name="">
    </form>
  </div>
</body>
</html>

VIDEO TUTORIAL: https://youtu.be/xTShp-tZbD0

Upvotes: 2

Sug
Sug

Reputation: 29

Following is the HTML -

<div id="div1" class="abc">
   <....inside tags...>
</div>

Following is the js -

var x = document.getElementById("div1");  
x.className += " otherclass";

Otherclass is is the name of the class added.

you can also refer to https://developer.mozilla.org/en-US/docs/Web/API/Element/className

Upvotes: 1

Aitor
Aitor

Reputation: 465

You need javascript to do this. Function example:

function addClass() {
    var element = document.getElementsByClassName("sq-input");
    element.classList.add("-top");
}

For more information: https://www.w3schools.com/howto/howto_js_add_class.asp

Upvotes: 0

Adesh Kumar
Adesh Kumar

Reputation: 960

you can use jquery to do so

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("button").click(function(){
        $("p:first").addClass("intro");
    });
});
</script>
<style>
.intro {
    font-size: 45px;
    color: blue;
    text-decoration:underline;
}
</style>
</head>
<body>
<p>This is a paragraph.</p>
<p>This is another paragraph.</p>

<button>Add a class name to the first p element</button>

</body>
</html>

Upvotes: 0

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