轉換新創建的元素 javascript

Question

我正在為 Web 項目中的場景設置動畫。 因此我使用的是普通的 Javascript。 在我的腳本中，我正在創建一個具有某些屬性的新“div”元素。 目標是在過渡期間在 2 秒內為寬度屬性設置動畫，線性方式，沒有延遲。

瀏覽器使用新的“寬度”值創建一個新元素，如何從舊的“寬度”動畫到新的“寬度”？

function planTrail(){

//do this if the values check out.. 
var large_dashboard = document.createElement('div');
var large_dashboard = document.createElement('div');
large_dashboard.id = "large_dash";
large_dashboard.style.backgroundColor = "#515151";
large_dashboard.style.border = "solid 2px black";
large_dashboard.style.height = "58vh"; 
large_dashboard.style.position = "fixed";
large_dashboard.style.borderRadius = "1em";
large_dashboard.style.right = "10vw";
large_dashboard.style.top = "25vh";
large_dashboard.style.width = "8vw";

var current_section = document.getElementById("first_part_page");
document.body.insertBefore(large_dashboard, current_section);


//how can I call a transition on my newly called element? 
//browser creates second element with the new value for width, without transition

var large_dash = document.getElementById("large_dash"); 

large_dash.style.width = "80vw"; 
large_dash.style.setProperty("-webkit-transition", "width 2s linear 0s");
large_dash.style.setProperty("-moz-transition", "width 2s linear 0s");
large_dash.style.setProperty("-o-transition", "width 2s linear 0s");
large_dash.style.setProperty("transition", "width 2s linear 0s");
}

我沒有插入我的完整 Web 項目，因為這是一個非常具體的問題。 如果你需要它我很樂意提供它..

Answer 1

使用 setTimeout 延遲更改寬度，例如：

function planTrail() {

    //do this if the values check out.. 
    var large_dashboard = document.createElement('div');
    var large_dashboard = document.createElement('div');
    large_dashboard.id = "large_dash";
    large_dashboard.style.backgroundColor = "#515151";
    large_dashboard.style.border = "solid 2px black";
    large_dashboard.style.height = "58vh";
    large_dashboard.style.position = "fixed";
    large_dashboard.style.borderRadius = "1em";
    large_dashboard.style.right = "10vw";
    large_dashboard.style.top = "25vh";
    large_dashboard.style.width = "8vw";

    var current_section = document.getElementById("first_part_page");
    document.body.insertBefore(large_dashboard, current_section);

    var large_dash = document.getElementById("large_dash");
    large_dash.style.setProperty("-webkit-transition", "width 2s linear 0s");
    large_dash.style.setProperty("-moz-transition", "width 2s linear 0s");
    large_dash.style.setProperty("-o-transition", "width 2s linear 0s");
    large_dash.style.setProperty("transition", "width 2s linear 0s");

    setTimeout(function () {
        large_dash.style.width = "80vw";
    }, 0);
}