Javascript 设置按钮处于活动状态

Question

I have a table of buttons and once it is populated, I am using

document.getElementById("btn0").click();

to click the first button. The button is doing what it should do, but the background color of the button is not changing the same way it does when I am clicking it manually.

As you can see when its running, the background-color of the div is changing, but the button is not set to active.

Code Snippet:

 var myfunc = function(){ document.getElementById("test").style.backgroundColor="red"; }; document.getElementById("btn0").click();

 .btn{ border: none; color: white; width: 100%; padding: 5px 5px 5px 5px; height: 50px; cursor: pointer; font-size: 12px; background-color: #343a40; } .btn:active .btn.active{ background-color:green; outline: none; } .btn:focus{ background-color:green; outline: none; } #test{ background-color: green; width: 600px; height: 400px; }

 <button class="btn" onclick="myfunc()" id="btn0"> Cool button</button> <div id="test"> Hello </div>

Here is a link to a jsfiddle I created: https://jsfiddle.net/58hrwcgo/3/

Answer 1

There's a difference between click and focus .

click() clicks on the element and then unfocuses, unlike a real mouse click, which clicks and then focuses.

I would recommend simulating a real click by doing both:

document.getElementById("btn0").click();
document.getElementById("btn0").focus();

Answer 2

js

const btn = document.getElementById("btn0")
var myfunc = function(){
    document.getElementById("test").style.backgroundColor="red";
    btn.focus();
};

btn.click();

css

...

.btn:active, .btn.active{
  background-color:green;
  outline: none;
}

...

Answer 3

When clicking manually a focus state ist triggered first. That's why the appearance changes according to your class .btn:focus .

document.getElementById("btn0").focus();
document.getElementById("btn0").click();

will lead to the desired behavior.

Furthermore you're missing a colon in your CSS-Example within the :active state:

.btn:active, .btn.active { ... }

Answer 4

You can try the HTML DOM focus() method.

 document.getElementById("btn0").focus(); 

You can read more about this in here .