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HTML CSS JS imitates win10 brightness adjustment effect
Code
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>模仿win10的亮度调节</title>
<style>
.control_bar{
height:200px;
width:500px;
border-bottom:3px solid #888888;
}
.control_bar_cursor{
height:25px;
width:8px;
background: #505151;
border-radius:5px;
margin-top:-12.5px;
position:relative;
top:0;
left:0;
}
.control_bar_cursor:hover{
background:white;
}
#control_bar_mask{
margin-top:-203px;
width:0px;
}
.mask{
position:fixed;
bottom:0;
top:0;
left:0;
right:0;
background:black;
z-index:-1;
}
</style>
</head>
<body>
<p class="mask"></p>
<p class="control_bar"></p>
<p class="control_bar" style="border-bottom:3px solid #505151;" id="control_bar_mask"></p>
<p class="control_bar_cursor"></p>
</body>
<script>
window.onload = function(){
var control_bar = document.getElementsByClassName("control_bar")[0];
var control_bar_mask = document.getElementById("control_bar_mask");
var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
var def_left = control_bar_cursor.offsetLeft;
var mask = document.getElementsByClassName("mask")[0];
document.body.onmousedown = function(){
window.onmousemove = function(){
var cursor_X = event.clientX;
var cursor_Y = event.clientY;
if(cursor_X < def_left){
control_bar_cursor.style.left = 0;
}else if(cursor_X > control_bar.offsetWidth + def_left){
control_bar_cursor.style.left = control_bar.offsetWidth;
}else{
control_bar_cursor.style.left = cursor_X - def_left + "px";
}
//亮度比
var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
mask.style.opacity = 1 - proportion;
};
window.onmouseup = function(){
window.onmousemove = null;
};
};
};
</script>
</html>1. Write out the appearance of each element
Here, a background color is added to the body for easy observation
html
<p class="control_bar"> </p> <p class="control_bar" style="border-bottom:3px solid #505151;" id="control_bar_mask> </p> <p class="control_bar_cursor"> </p>
css
body{
background:back;
}
.control_bar{
height:200px;
width:500px;
border-bottom:3px solid #888888;
}
.control_bar_cursor{
height:25px;
width:8px;
background: #505151;
border-radius:5px;
}Rendering
2. Stack each element together
css
body{
background:black;
}
.control_bar{
height:200px;
width:500px;
border-bottom:3px solid #888888;
}
.control_bar_cursor{
height:25px;
width:8px;
background: #505151;
border-radius:5px;
margin-top:-12.5px;
position:relative;
top:0;
left:0;
}
.control_bar_cursor:hover{
background:white;
}
#control_bar_mask{
margin-top:-203px;
width:100px;
}In order to show the mask effect, the p width of the mask layer is set small
3. Add js
js
window.onload = function(){
var control_bar = document.getElementsByClassName("control_bar")[0];
var control_bar_mask = document.getElementById("control_bar_mask");
var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
var def_left = control_bar_cursor.offsetLeft;
document.body.onmousedown = function(){
window.onmousemove = function(){
var cursor_X = event.clientX;
var cursor_Y = event.clientY;
if(cursor_X < def_left){
control_bar_cursor.style.left = 0;
}else if(cursor_X > control_bar.offsetWidth + def_left){
control_bar_cursor.style.left = control_bar.offsetWidth;
}else{
control_bar_cursor.style.left = cursor_X - def_left + "px";
}
var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
};
window.onmouseup = function(){
window.onmousemove = null;
};
};
};4. Add a mask and use the control bar to control its transparency to achieve the brightness adjustment effect
<p class="mask"></p>
.mask{
position:fixed;
bottom:0;
top:0;
left:0;
right:0;
background:black;
z-index:-1;
}window.onload = function(){
var control_bar = document.getElementsByClassName("control_bar")[0];
var control_bar_mask = document.getElementById("control_bar_mask");
var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
var def_left = control_bar_cursor.offsetLeft;
var mask = document.getElementsByClassName("mask")[0];
document.body.onmousedown = function(){
window.onmousemove = function(){
var cursor_X = event.clientX;
var cursor_Y = event.clientY;
if(cursor_X < def_left){
control_bar_cursor.style.left = 0;
}else if(cursor_X > control_bar.offsetWidth + def_left){
control_bar_cursor.style.left = control_bar.offsetWidth;
}else{
control_bar_cursor.style.left = cursor_X - def_left + "px";
}
//亮度比
var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
mask.style.opacity = 1 - proportion;
};
window.onmouseup = function(){
window.onmousemove = null;
};
};
};Recommended tutorial: "HTMLTutorial"
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