CODEWITHSUNDEEP
javascriptevent-delegation
Teoman Tıngır
Teoman Tıngır

Reputation: 2866

Event Delegation - cant change button class and value

I'm trying to ban users and remove their bans using vanilla javascript. I'm using datatables, so I have to use event delegation to fire events..

But when I done with banning user, I can't change button class or value, how can I do that ? 

document.querySelector(".m-portlet__body").addEventListener("click", function (e) {
        if (e.target.className === "btn btn-danger btn-sm btn-block") {
            console.log(e.target)
            let id = e.target.dataset.id,
                xhr = new XMLHttpRequest(),
                token = document.head.querySelector("[name=csrf-token]").content;
            xhr.open("POST", "users/ban/" + id);
            xhr.setRequestHeader("X-CSRF-TOKEN", token);
            xhr.onreadystatechange = function() {
                if (xhr.readyState === 4) {
                    let response = JSON.parse(xhr.responseText);
                    if (xhr.status === 200 && response.status === 'OK') {
                        e.target.className.replace("btn-danger","btn-success");
                        e.target.value = "Remove Ban"
                //I also try with;
                //e.target.classList.remove("btn-danger");
                //e.target.classList.add("btn-success");
                    } else {
                        console.log('failed');
                    }
                }
            }
            xhr.send();
        }

        if (e.target.className === "btn btn-success btn-sm btn-block"){

        }
    })

Upvotes: 0

Views: 93

Answers (1)

mpm
mpm

Reputation: 20155

JS strings are immutable, which means String#replace isn't going to replace the original string but return a new string.

 e.target.className = e.target.className.replace("btn-danger","btn-success")

Will change e.target.className value

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace

if the target is a button element and not input[type=button] then you can't change its text content with e.target.value, you need to use e.target.textContent = "New value";

Upvotes: 2

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