Apply CSS-Style to HTML classes created with javascript

Question

I want to apply the style form my CSS file to a HTML class which I created with Javascript.

My Code looks like this `

    socket.on('chat', function (data) {
        feedback.innerHTML = '';
        var mewTime = document.createElement("span")
        mewTime.class = "chatTime";
        mewTime.text = data.currentTime;

        console.log(mewTime);

        var userName = createUser(data, mewTime);

        var content = document.createElement("span")
        content.class = "messageContent"
        content.append(data.messageInput)

        var message = document.createElement("div")
        message.class = "message";
        message.append(userName[0].outerHTML);
        message.append(mewTime);
        message.append(document.createElement("br"))
        message.append(content);

        output.append(message);

        currentTime = '';
        messageInput.focus();
    });

function createUser(data, time){
    if(time === null){
        var userName = $('<span class="userNameOnline"/>');
        userName.text(data);  
    } else{
        var userName = $('<span class="userName"/>')
            .text(data.username + ' ' + time.text);
    }
    console.log(userName);
    return userName;
}

// CSS
.message{
color: red;
}

.userName {
color: blue;
}

`

I can access the text in the message but I can't style it with my CSS.

I tried to use .outerHTML, .innerHTML, .text. On the console it shows that the class is correctly set.

Which element do you want to change? Have you tried element.className = "message"? — nick zoum
– nick zoum, Commented Mar 19, 2019 at 11:27
But isn't it possible that my style.css file applys the style to it? — TryingToCode
– TryingToCode, Commented Mar 19, 2019 at 11:27
developer.mozilla.org/en-US/docs/Web/API/Element/classList classList is the html5 way to do it. Otherwise you should use the className property as nick proposed. This way the style of your css will be applied to the element. — Mark Baijens
– Mark Baijens, Commented Mar 19, 2019 at 11:31

Mickael B. · Accepted Answer · 2020-01-16 19:02:18Z

2

You're looking for classList.add('') instead of class = ''. You can find more information here.

Here's a basic example:

   
var message = document.createElement("div")
message.classList.add("message")


document.getElementById("output").append(message);

.message {
  height: 200px;
  width: 200px;
  background: blue;
}

<div id="output"></div>

In your code you can change it to the following and it should work:

var message = document.createElement("div")
message.classList.add("message")
message.append(userName[0].outerHTML);
message.append(mewTime);
message.append(document.createElement("br"))
message.append(content);

output.append(message);

edited Jan 16, 2020 at 19:02

Mickael B.

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answered Mar 19, 2019 at 11:36

James Ives

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Comments

Claeusdev · Accepted Answer · 2019-03-19 11:31:57Z

1

You can call .setAttribute("attributeName", "value of attribute") or you can also use .className instead of a normal class. So for your example we can have something like:

var mewTime = document.createElement("span");
mewTime.setAttribute("class", "chatTime");

OR

var mewTime = document.createElement("span");
mewTime.className = "chatTime"

answered Mar 19, 2019 at 11:31

Claeusdev

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Comments

Mickael B. · Accepted Answer · 2020-01-16 17:46:36Z

1

$(document).ready(function() {
    document.getElementById("divTest").classList.add('red');
});

.red {
  background-color: red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<html>
  <head>
    
  </head>
  <body>
    <div id='divTest'>
      test
    </div>
  </body>
</html>

You should use classList: https://developer.mozilla.org/en-US/docs/Web/API/Element/classList

edited Jan 16, 2020 at 17:46

Mickael B.

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answered Mar 19, 2019 at 11:32

ProblemsEverywhere

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Comments

Gulmuhammad Akbari · Accepted Answer · 2019-03-19 11:27:54Z

0

You could use as below example to apply CSS on HTML element in Javascript:

yourElement.style.border= "1px solid red";

answered Mar 19, 2019 at 11:27

Gulmuhammad Akbari

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2 Comments

TryingToCode Over a year ago

Thank you. But i want to have all my styling in one file and not in my script file and my css file. Is this possiple?

Gulmuhammad Akbari Over a year ago

Yes why not, but I didnt understand what you want to exactly.

Yisal Khan · Accepted Answer · 2019-03-19 11:40:14Z

0

Following is the method to do that.

var newElement = document.createElement("p");
newElement.setAttribute("class", "className");

answered Mar 19, 2019 at 11:40

Yisal Khan

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Comments

Hien Nguyen · Accepted Answer · 2019-03-19 11:42:44Z

0

You can do like this

function myFunction() {
var message = document.createElement("span");
message.innerHTML = "Test"
        message.className = "message";
        
         document.body.appendChild(message);
}

.message{
color:red;
}

<!DOCTYPE html>
<html>
<body>

<p>Click the button to make element.</p>

<button onclick="myFunction()">Create</button>

<script>

</script>

</body>
</html>

edited Mar 19, 2019 at 11:42

answered Mar 19, 2019 at 11:37

Hien Nguyen

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Comments

Hassan Siddiqui · Accepted Answer · 2019-03-19 11:46:45Z

-1

Just change class to className, I hope it'll help you out. Thanks

    mewTime.className = "chatTime";

    content.className = "messageContent"

    message.className = "message";

edited Mar 19, 2019 at 11:46

answered Mar 19, 2019 at 11:38

Hassan Siddiqui

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