我有来自Codepen的这段代码,它使可调整大小的div从角落调整大小:
<div class='resizable'>
<div class='resizers'>
<div class='resizer top-left'></div>
<div class='resizer top-right'></div>
<div class='resizer bottom-left'></div>
<div class='resizer bottom-right'></div>
</div>
</div>
body,
html {
background: black;
}
.resizable {
background: white;
width: 100px;
height: 100px;
position: absolute;
top: 100px;
left: 100px;
}
.resizable .resizers{
width: 100%;
height: 100%;
border: 3px solid #4286f4;
box-sizing: border-box;
}
.resizable .resizers .resizer{
width: 10px;
height: 10px;
border-radius: 50%; /*magic to turn square into circle*/
background: white;
border: 3px solid #4286f4;
position: absolute;
}
.resizable .resizers .resizer.top-left {
left: -5px;
top: -5px;
cursor: nwse-resize; /*resizer cursor*/
}
.resizable .resizers .resizer.top-right {
right: -5px;
top: -5px;
cursor: nesw-resize;
}
.resizable .resizers .resizer.bottom-left {
left: -5px;
bottom: -5px;
cursor: nesw-resize;
}
.resizable .resizers .resizer.bottom-right {
right: -5px;
bottom: -5px;
cursor: nwse-resize;
}
function makeResizableDiv(div) {
const element = document.querySelector(div);
const resizers = document.querySelectorAll(div + ' .resizer')
const minimum_size = 20;
let original_width = 0;
let original_height = 0;
let original_x = 0;
let original_y = 0;
let original_mouse_x = 0;
let original_mouse_y = 0;
for (let i = 0;i < resizers.length; i++) {
const currentResizer = resizers[i];
currentResizer.addEventListener('mousedown', function(e) {
e.preventDefault()
original_width = parseFloat(getComputedStyle(element, null).getPropertyValue('width').replace('px', ''));
original_height = parseFloat(getComputedStyle(element, null).getPropertyValue('height').replace('px', ''));
original_x = element.getBoundingClientRect().left;
original_y = element.getBoundingClientRect().top;
original_mouse_x = e.pageX;
original_mouse_y = e.pageY;
window.addEventListener('mousemove', resize)
window.addEventListener('mouseup', stopResize)
})
function resize(e) {
if (currentResizer.classList.contains('bottom-right')) {
const width = original_width + (e.pageX - original_mouse_x);
const height = original_height + (e.pageY - original_mouse_y)
if (width > minimum_size) {
element.style.width = width + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
}
}
else if (currentResizer.classList.contains('bottom-left')) {
const height = original_height + (e.pageY - original_mouse_y)
const width = original_width - (e.pageX - original_mouse_x)
if (height > minimum_size) {
element.style.height = height + 'px'
}
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
}
else if (currentResizer.classList.contains('top-right')) {
const width = original_width + (e.pageX - original_mouse_x)
const height = original_height - (e.pageY - original_mouse_y)
if (width > minimum_size) {
element.style.width = width + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
else {
const width = original_width - (e.pageX - original_mouse_x)
const height = original_height - (e.pageY - original_mouse_y)
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
}
function stopResize() {
window.removeEventListener('mousemove', resize)
}
}
}
makeResizableDiv('.resizable')
我如何从侧面调整大小? 它的右侧,左侧,底部,右侧和顶部的中部应该有一个圆圈,并从此处调整大小。 这是原始笔的链接: Medium: Making a resizable div
可能需要四个新的if和四个新的CSS类,但我不确定。
答案 0 :(得分:1)
我调整了位置和类别标题以将手柄放在侧面,然后从每个脚本中删除了可以同时调整两个方向的脚本。
function makeResizableDiv(div) {
const element = document.querySelector(div);
const resizers = document.querySelectorAll(div + ' .resizer')
const minimum_size = 20;
let original_width = 0;
let original_height = 0;
let original_x = 0;
let original_y = 0;
let original_mouse_x = 0;
let original_mouse_y = 0;
for (let i = 0;i < resizers.length; i++) {
const currentResizer = resizers[i];
currentResizer.addEventListener('mousedown', function(e) {
e.preventDefault()
original_width = parseFloat(getComputedStyle(element, null).getPropertyValue('width').replace('px', ''));
original_height = parseFloat(getComputedStyle(element, null).getPropertyValue('height').replace('px', ''));
original_x = element.getBoundingClientRect().left;
original_y = element.getBoundingClientRect().top;
original_mouse_x = e.pageX;
original_mouse_y = e.pageY;
window.addEventListener('mousemove', resize)
window.addEventListener('mouseup', stopResize)
})
function resize(e) {
if (currentResizer.classList.contains('right')) {
const width = original_width + (e.pageX - original_mouse_x);
if (width > minimum_size) {
element.style.width = width + 'px'
}
}
else if (currentResizer.classList.contains('left')) {
const width = original_width - (e.pageX - original_mouse_x)
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
}
else if (currentResizer.classList.contains('top')) {
const height = original_height - (e.pageY - original_mouse_y)
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
else if (currentResizer.classList.contains('bottom')) {
const height = original_height + (e.pageY - original_mouse_y)
if (height > minimum_size) {
element.style.height = height + 'px'
}
}
}
function stopResize() {
window.removeEventListener('mousemove', resize)
}
}
}
makeResizableDiv('.resizable')
body,
html {
background: black;
}
.resizable {
background: white;
width: 100px;
height: 100px;
position: absolute;
top: 100px;
left: 100px;
}
.resizable .resizers{
width: 100%;
height: 100%;
border: 3px solid #4286f4;
box-sizing: border-box;
}
.resizable .resizers .resizer{
width: 10px;
height: 10px;
border-radius: 50%; /*magic to turn square into circle*/
background: white;
border: 3px solid #4286f4;
position: absolute;
}
.resizer.top {
left: 50%;
top: -5px;
cursor: ns-resize;
transform: translate(-7px, 0px);
}
.resizer.right {
right: -5px;
bottom: 50%;
cursor: ew-resize;
transform: translate(0px, 5px);
}
.resizer.bottom {
left: 50%;
bottom: -5px;
cursor: ns-resize;
transform: translate(-7px, 0px);
}
.resizer.left {
left: -5px;
bottom: 50%;
cursor: ew-resize;
transform: translate(0px, 5px);
}
<div class='resizable'>
<div class='resizers'>
<div class='resizer top'></div>
<div class='resizer right'></div>
<div class='resizer bottom'></div>
<div class='resizer left'></div>
</div>
</div>