单击时JavaScript按钮样式更改 [英] JavaScript Button Style change on click
问题描述
我已将这段JavaScript放在一起,但由于我是新手,我正在努力解决这些问题。我想要做的是当点击一个按钮时,它将改变背景颜色的不透明度。下面的代码执行此操作,但现在我希望当我再次单击它时按钮恢复到正常状态。
I have put together this piece of JavaScript, but I am struggling with the code as I'm a newbie. What I want to do is when a button is clicked it will change the background color opacity. The code below does this, but now I want the button to be reverted to the normal state when I click it again.
我该怎么做?谢谢..
How can I do this? Thanks..
正常状态:background =rgba(255,0,0,0.8);按下状态:
background =rgba(255,0,0,0.6);
Normal state: background="rgba(255,0,0,0.8)"; Pressed state: background="rgba(255,0,0,0.6)";
function highlight(id) {
document.getElementById(id).style.background="rgba(255,0,0,0.6)";
}
推荐答案
我会使用CSS类:
.opacityClicked{
background:rgba(255,0,0,0.8);
}
.opacityDefault{
background:rgba(255,0,0,0.6);
}
并将您的功能更改为:
function highlight(id) {
var element = document.getElementById(id);
element.class = (element.class == "opacityClicked") ? "opacityDefault" : "opacityClicked";
}
或者如果你只想使用JavaScript
Or if you want to use only JavaScript
var isClicked = false;
function highlight(id) {
isClicked = !isClicked;
var element = document.getElementById(id);
element.style.background = (isClicked == true) ? "rgba(255,0,0,0.6)" : "rgba(255,0,0,0.8)";
}
更新(查看评论:如果使用2个按钮):
Update(See comments: if you use 2 buttons):
var buttonClicked = null;
function highlight(id) {
if(buttonClicked != null)
{
buttonClicked.style.background = "rgba(255,0,0,0.8)";
}
buttonClicked = document.getElementById(id);
buttonClicked.style.background = "rgba(255,0,0,0.6)";
}
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