新创建元素的过渡 javascript

Question

我正在为 Web 项目中的场景制作动画。因此我使用的是纯 Javascript。在我的脚本中，我正在创建一个具有特定属性的新 "div" 元素。目标是在过渡期间以线性方式在 2 秒内为宽度属性设置动画，没有延迟。

浏览器使用新的 "width" 值创建了一个新元素，我如何从旧到新设置动画？"width"？

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");
}

我没有插入完整的 Web 项目，因为这是一个非常具体的问题。如果你需要我会很乐意提供..

Answer 1

使用 setTimeout 延迟更改宽度，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);
}

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