如何使用纯 Javascript 调整 HTML 元素的大小？
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时间：2020-08-24 08:12:42 来源:igfitidea点击:
How to make HTML element resizable using pure Javascript?
提问by monk
I was wondering how we can make a HTML element like <div>or <p>tag element resizable when clicked using pure JavaScript, not the jQuery library or any other library.
我想知道如何在使用纯 JavaScript（而不是 jQuery 库或任何其他库）单击时使 HTML 元素 like<div>或<p>tag 元素可调整大小。
回答by user123444555621
I really recommend using some sort of library, but you asked for it, you get it:
我真的建议使用某种图书馆，但你要求它，你得到它：
var p = document.querySelector('p'); // element to make resizable
p.addEventListener('click', function init() {
p.removeEventListener('click', init, false);
p.className = p.className + ' resizable';
var resizer = document.createElement('div');
resizer.className = 'resizer';
p.appendChild(resizer);
resizer.addEventListener('mousedown', initDrag, false);
}, false);
var startX, startY, startWidth, startHeight;
function initDrag(e) {
startX = e.clientX;
startY = e.clientY;
startWidth = parseInt(document.defaultView.getComputedStyle(p).width, 10);
startHeight = parseInt(document.defaultView.getComputedStyle(p).height, 10);
document.documentElement.addEventListener('mousemove', doDrag, false);
document.documentElement.addEventListener('mouseup', stopDrag, false);
}
function doDrag(e) {
p.style.width = (startWidth + e.clientX - startX) + 'px';
p.style.height = (startHeight + e.clientY - startY) + 'px';
}
function stopDrag(e) {
document.documentElement.removeEventListener('mousemove', doDrag, false);
document.documentElement.removeEventListener('mouseup', stopDrag, false);
}
Remember that this may not run in all browsers (tested only in Firefox, definitely not working in IE <9).
请记住，这可能无法在所有浏览器中运行（仅在 Firefox 中测试，绝对不适用于 IE <9）。
回答by Alex
what about a pure css3 solution?
纯 css3 解决方案怎么样？
div {
resize: both;
overflow: auto;
}
回答by Lazaro
Is simple:
很简单：
Example:https://jsfiddle.net/RainStudios/mw786v1w/
示例：https: //jsfiddle.net/RainStudios/mw786v1w/
var element = document.getElementById('element');
//create box in bottom-left
var resizer = document.createElement('div');
resizer.style.width = '10px';
resizer.style.height = '10px';
resizer.style.background = 'red';
resizer.style.position = 'absolute';
resizer.style.right = 0;
resizer.style.bottom = 0;
resizer.style.cursor = 'se-resize';
//Append Child to Element
element.appendChild(resizer);
//box function onmousemove
resizer.addEventListener('mousedown', initResize, false);
//Window funtion mousemove & mouseup
function initResize(e) {
window.addEventListener('mousemove', Resize, false);
window.addEventListener('mouseup', stopResize, false);
}
//resize the element
function Resize(e) {
element.style.width = (e.clientX - element.offsetLeft) + 'px';
element.style.height = (e.clientY - element.offsetTop) + 'px';
}
//on mouseup remove windows functions mousemove & mouseup
function stopResize(e) {
window.removeEventListener('mousemove', Resize, false);
window.removeEventListener('mouseup', stopResize, false);
}
回答by Andrej
See my cross browser compatible resizer.
查看我的跨浏览器兼容resizer。
<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>resizer</title>
<meta name="author" content="Andrej Hristoliubov [email protected]">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="https://rawgit.com/anhr/resizer/master/Common.js"></script>
<script type="text/javascript" src="https://rawgit.com/anhr/resizer/master/resizer.js"></script>
<style>
.element {
border: 1px solid #999999;
border-radius: 4px;
margin: 5px;
padding: 5px;
}
</style>
<script type="text/javascript">
function onresize() {
var element1 = document.getElementById("element1");
var element2 = document.getElementById("element2");
var element3 = document.getElementById("element3");
var ResizerY = document.getElementById("resizerY");
ResizerY.style.top = element3.offsetTop - 15 + "px";
var topElements = document.getElementById("topElements");
topElements.style.height = ResizerY.offsetTop - 20 + "px";
var height = topElements.clientHeight - 32;
if (height < 0)
height = 0;
height += 'px';
element1.style.height = height;
element2.style.height = height;
}
function resizeX(x) {
//consoleLog("mousemove(X = " + e.pageX + ")");
var element2 = document.getElementById("element2");
element2.style.width =
element2.parentElement.clientWidth
+ document.getElementById('rezizeArea').offsetLeft
- x
+ 'px';
}
function resizeY(y) {
//consoleLog("mousemove(Y = " + e.pageY + ")");
var element3 = document.getElementById("element3");
var height =
element3.parentElement.clientHeight
+ document.getElementById('rezizeArea').offsetTop
- y
;
//consoleLog("mousemove(Y = " + e.pageY + ") height = " + height + " element3.parentElement.clientHeight = " + element3.parentElement.clientHeight);
if ((height + 100) > element3.parentElement.clientHeight)
return;//Limit of the height of the elemtnt 3
element3.style.height = height + 'px';
onresize();
}
var emailSubject = "Resizer example error";
</script>
</head>
<body>
<div id='Message'></div>
<h1>Resizer</h1>
<p>Please see example of resizing of the HTML element by mouse dragging.</p>
<ul>
<li>Drag the red rectangle if you want to change the width of the Element 1 and Element 2</li>
<li>Drag the green rectangle if you want to change the height of the Element 1 Element 2 and Element 3</li>
<li>Drag the small blue square at the left bottom of the Element 2, if you want to resize of the Element 1 Element 2 and Element 3</li>
</ul>
<div id="rezizeArea" style="width:1000px; height:250px; overflow:auto; position: relative;" class="element">
<div id="topElements" class="element" style="overflow:auto; position:absolute; left: 0; top: 0; right:0;">
<div id="element2" class="element" style="width: 30%; height:10px; float: right; position: relative;">
Element 2
<div id="resizerXY" style="width: 10px; height: 10px; background: blue; position:absolute; left: 0; bottom: 0;"></div>
<script type="text/javascript">
resizerXY("resizerXY", function (e) {
resizeX(e.pageX + 10);
resizeY(e.pageY + 50);
});
</script>
</div>
<div id="resizerX" style="width: 10px; height:100%; background: red; float: right;"></div>
<script type="text/javascript">
resizerX("resizerX", function (e) {
resizeX(e.pageX + 25);
});
</script>
<div id="element1" class="element" style="height:10px; overflow:auto;">Element 1</div>
</div>
<div id="resizerY" style="height:10px; position:absolute; left: 0; right:0; background: green;"></div>
<script type="text/javascript">
resizerY("resizerY", function (e) {
resizeY(e.pageY + 25);
});
</script>
<div id="element3" class="element" style="height:100px; position:absolute; left: 0; bottom: 0; right:0;">Element 3</div>
</div>
<script type="text/javascript">
onresize();
</script>
</body>
</html>Also see my example of resizer
另请参阅我的resizer示例
回答by Travis Tidwell
I just created a CodePen that shows how this can be done pretty easily using ES6.
我刚刚创建了一个 CodePen，它展示了如何使用 ES6 轻松完成此操作。
http://codepen.io/travist/pen/GWRBQV
http://codepen.io/travist/pen/GWRBQV
Basically, here is the class that does this.
基本上，这是执行此操作的类。
let getPropertyValue = function(style, prop) {
let value = style.getPropertyValue(prop);
value = value ? value.replace(/[^0-9.]/g, '') : '0';
return parseFloat(value);
}
let getElementRect = function(element) {
let style = window.getComputedStyle(element, null);
return {
x: getPropertyValue(style, 'left'),
y: getPropertyValue(style, 'top'),
width: getPropertyValue(style, 'width'),
height: getPropertyValue(style, 'height')
}
}
class Resizer {
constructor(wrapper, element, options) {
this.wrapper = wrapper;
this.element = element;
this.options = options;
this.offsetX = 0;
this.offsetY = 0;
this.handle = document.createElement('div');
this.handle.setAttribute('class', 'drag-resize-handlers');
this.handle.setAttribute('data-direction', 'br');
this.wrapper.appendChild(this.handle);
this.wrapper.style.top = this.element.style.top;
this.wrapper.style.left = this.element.style.left;
this.wrapper.style.width = this.element.style.width;
this.wrapper.style.height = this.element.style.height;
this.element.style.position = 'relative';
this.element.style.top = 0;
this.element.style.left = 0;
this.onResize = this.resizeHandler.bind(this);
this.onStop = this.stopResize.bind(this);
this.handle.addEventListener('mousedown', this.initResize.bind(this));
}
initResize(event) {
this.stopResize(event, true);
this.handle.addEventListener('mousemove', this.onResize);
this.handle.addEventListener('mouseup', this.onStop);
}
resizeHandler(event) {
this.offsetX = event.clientX - (this.wrapper.offsetLeft + this.handle.offsetLeft);
this.offsetY = event.clientY - (this.wrapper.offsetTop + this.handle.offsetTop);
let wrapperRect = getElementRect(this.wrapper);
let elementRect = getElementRect(this.element);
this.wrapper.style.width = (wrapperRect.width + this.offsetX) + 'px';
this.wrapper.style.height = (wrapperRect.height + this.offsetY) + 'px';
this.element.style.width = (elementRect.width + this.offsetX) + 'px';
this.element.style.height = (elementRect.height + this.offsetY) + 'px';
}
stopResize(event, nocb) {
this.handle.removeEventListener('mousemove', this.onResize);
this.handle.removeEventListener('mouseup', this.onStop);
}
}
class Dragger {
constructor(wrapper, element, options) {
this.wrapper = wrapper;
this.options = options;
this.element = element;
this.element.draggable = true;
this.element.setAttribute('draggable', true);
this.element.addEventListener('dragstart', this.dragStart.bind(this));
}
dragStart(event) {
let wrapperRect = getElementRect(this.wrapper);
var x = wrapperRect.x - parseFloat(event.clientX);
var y = wrapperRect.y - parseFloat(event.clientY);
event.dataTransfer.setData("text/plain", this.element.id + ',' + x + ',' + y);
}
dragStop(event, prevX, prevY) {
var posX = parseFloat(event.clientX) + prevX;
var posY = parseFloat(event.clientY) + prevY;
this.wrapper.style.left = posX + 'px';
this.wrapper.style.top = posY + 'px';
}
}
class DragResize {
constructor(element, options) {
options = options || {};
this.wrapper = document.createElement('div');
this.wrapper.setAttribute('class', 'tooltip drag-resize');
if (element.parentNode) {
element.parentNode.insertBefore(this.wrapper, element);
}
this.wrapper.appendChild(element);
element.resizer = new Resizer(this.wrapper, element, options);
element.dragger = new Dragger(this.wrapper, element, options);
}
}
document.body.addEventListener('dragover', function (event) {
event.preventDefault();
return false;
});
document.body.addEventListener('drop', function (event) {
event.preventDefault();
var dropData = event.dataTransfer.getData("text/plain").split(',');
var element = document.getElementById(dropData[0]);
element.dragger.dragStop(event, parseFloat(dropData[1]), parseFloat(dropData[2]));
return false;
});
回答by coder
I have created a function that recieve an id of an html element and adds a border to it's right side the function is general and just recieves an id so you can copy it as it is and it will work
我创建了一个函数，它接收一个 html 元素的 id 并在它的右侧添加一个边框，这个函数是通用的，只是接收一个 id，所以你可以按原样复制它，它会起作用
var myoffset;
function resizeE(elem){
var borderDiv = document.createElement("div");
borderDiv.className = "border";
borderDiv.addEventListener("mousedown",myresize = function myrsize(e) {
myoffset = e.clientX - (document.getElementById(elem).offsetLeft + parseInt(window.getComputedStyle(document.getElementById(elem)).getPropertyValue("width")));
window.addEventListener("mouseup",mouseUp);
document.addEventListener("mousemove",mouseMove = function mousMove(e) {
document.getElementById(elem).style.width = `${e.clientX - myoffset - document.getElementById(elem).offsetLeft}px`;
});
});
document.getElementById(elem).appendChild(borderDiv);
}
function mouseUp() {
document.removeEventListener("mousemove", mouseMove);
window.removeEventListener("mouseup",mouseUp);
}
function load()
{
resizeE("resizeableDiv");
resizeE("anotherresizeableDiv");
resizeE("anotherresizeableDiv1");
}.border {
position: absolute;
cursor: e-resize;
width: 9px;
right: -5px;
top: 0;
height: 100%;
}
#resizeableDiv {
width: 30vw;
height: 30vh;
background-color: #84f4c6;
position: relative;
}
#anotherresizeableDiv {
width: 30vw;
height: 30vh;
background-color: #9394f4;
position: relative;
}
#anotherresizeableDiv1 {
width: 30vw;
height: 30vh;
background-color: #43f4f4;
position: relative;
}
#anotherresizeableDiv1 .border{
background-color: black;
}
#anotherresizeableDiv .border{
width: 30px;
right: -200px;
background-color: green;
}<body onload="load()">
<div id="resizeableDiv">change my size with the east border</div>
<div id="anotherresizeableDiv1">with visible border</div>
</body>
<div id="anotherresizeableDiv">with editted outside border</div>
</body>resizeE("resizeableDiv"); //this calls a function that does the magic to the id inserted
回答by fenderOne
There are very good examples here to start trying with, but all of them are based on adding some extra or external element like a "div" as a reference element to drag it, and calculate the new dimensions or position of the original element.
这里有很多很好的例子可以开始尝试，但所有这些都是基于添加一些额外的或外部元素，如“div”作为参考元素来拖动它，并计算原始元素的新尺寸或位置。
Here's an example that doesn't use any extra elements. We could add borders, padding or margin without affecting its operation. In this example we have not added color, nor any visual reference to the borders nor to the lower right corner as a clue where you can enlarge or reduce dimensions, but using the cursor around the resizable elements the clues appears!
这是一个不使用任何额外元素的示例。我们可以在不影响其操作的情况下添加边框、填充或边距。在这个例子中，我们没有添加颜色，也没有对边框或右下角的任何视觉参考作为您可以放大或缩小尺寸的线索，但是使用可调整大小的元素周围的光标会出现线索！
let resizerForCenter = new Resizer('center')
resizerForCenter.initResizer()
See it in actionwith CodeSandbox:
使用 CodeSandbox查看它的实际效果：
In this example we use ES6, and a module that exports a class called Resizer. An example is worth a thousand words:
在这个例子中，我们使用 ES6，以及一个导出名为 Resizer 的类的模块。一个例子胜过千言万语：
Or with the code snippet:
或者使用代码片段：
const html = document.querySelector('html')
class Resizer {
constructor(elemId) {
this._elem = document.getElementById(elemId)
/**
* Stored binded context handlers for method passed to eventListeners!
*
* See: https://stackoverflow.com/questions/9720927/removing-event-listeners-as-class-prototype-functions
*/
this._checkBorderHandler = this._checkBorder.bind(this)
this._doResizeHandler = this._doResize.bind(this)
this._initResizerHandler = this.initResizer.bind(this)
this._onResizeHandler = this._onResize.bind(this)
}
initResizer() {
this.stopResizer()
this._beginResizer()
}
_beginResizer() {
this._elem.addEventListener('mousemove', this._checkBorderHandler, false)
}
stopResizer() {
html.style.cursor = 'default'
this._elem.style.cursor = 'default'
window.removeEventListener('mousemove', this._doResizeHandler, false)
window.removeEventListener('mouseup', this._initResizerHandler, false)
this._elem.removeEventListener('mousedown', this._onResizeHandler, false)
this._elem.removeEventListener('mousemove', this._checkBorderHandler, false)
}
_doResize(e) {
let elem = this._elem
let boxSizing = getComputedStyle(elem).boxSizing
let borderRight = 0
let borderLeft = 0
let borderTop = 0
let borderBottom = 0
let paddingRight = 0
let paddingLeft = 0
let paddingTop = 0
let paddingBottom = 0
switch (boxSizing) {
case 'content-box':
paddingRight = parseInt(getComputedStyle(elem).paddingRight)
paddingLeft = parseInt(getComputedStyle(elem).paddingLeft)
paddingTop = parseInt(getComputedStyle(elem).paddingTop)
paddingBottom = parseInt(getComputedStyle(elem).paddingBottom)
break
case 'border-box':
borderRight = parseInt(getComputedStyle(elem).borderRight)
borderLeft = parseInt(getComputedStyle(elem).borderLeft)
borderTop = parseInt(getComputedStyle(elem).borderTop)
borderBottom = parseInt(getComputedStyle(elem).borderBottom)
break
default: break
}
let horizontalAdjustment = (paddingRight + paddingLeft) - (borderRight + borderLeft)
let verticalAdjustment = (paddingTop + paddingBottom) - (borderTop + borderBottom)
let newWidth = elem.clientWidth + e.movementX - horizontalAdjustment + 'px'
let newHeight = elem.clientHeight + e.movementY - verticalAdjustment + 'px'
let cursorType = getComputedStyle(elem).cursor
switch (cursorType) {
case 'all-scroll':
elem.style.width = newWidth
elem.style.height = newHeight
break
case 'col-resize':
elem.style.width = newWidth
break
case 'row-resize':
elem.style.height = newHeight
break
default: break
}
}
_onResize(e) {
// On resizing state!
let elem = e.target
let newCursorType = undefined
let cursorType = getComputedStyle(elem).cursor
switch (cursorType) {
case 'nwse-resize':
newCursorType = 'all-scroll'
break
case 'ew-resize':
newCursorType = 'col-resize'
break
case 'ns-resize':
newCursorType = 'row-resize'
break
default: break
}
html.style.cursor = newCursorType // Avoid cursor's flickering
elem.style.cursor = newCursorType
// Remove what is not necessary, and could have side effects!
elem.removeEventListener('mousemove', this._checkBorderHandler, false);
// Events on resizing state
/**
* We do not apply the mousemove event on the elem to resize it, but to the window to prevent the mousemove from slippe out of the elem to resize. This work bc we calculate things based on the mouse position
*/
window.addEventListener('mousemove', this._doResizeHandler, false);
window.addEventListener('mouseup', this._initResizerHandler, false);
}
_checkBorder(e) {
const elem = e.target
const borderSensitivity = 5
const coor = getCoordenatesCursor(e)
const onRightBorder = ((coor.x + borderSensitivity) > elem.scrollWidth)
const onBottomBorder = ((coor.y + borderSensitivity) > elem.scrollHeight)
const onBottomRightCorner = (onRightBorder && onBottomBorder)
if (onBottomRightCorner) {
elem.style.cursor = 'nwse-resize'
} else if (onRightBorder) {
elem.style.cursor = 'ew-resize'
} else if (onBottomBorder) {
elem.style.cursor = 'ns-resize'
} else {
elem.style.cursor = 'auto'
}
if (onRightBorder || onBottomBorder) {
elem.addEventListener('mousedown', this._onResizeHandler, false)
} else {
elem.removeEventListener('mousedown', this._onResizeHandler, false)
}
}
}
function getCoordenatesCursor(e) {
let elem = e.target;
// Get the Viewport-relative coordinates of cursor.
let viewportX = e.clientX
let viewportY = e.clientY
// Viewport-relative position of the target element.
let elemRectangle = elem.getBoundingClientRect()
// The function returns the largest integer less than or equal to a given number.
let x = Math.floor(viewportX - elemRectangle.left) // - elem.scrollWidth
let y = Math.floor(viewportY - elemRectangle.top) // - elem.scrollHeight
return {x, y}
}
let resizerForCenter = new Resizer('center')
resizerForCenter.initResizer()
let resizerForLeft = new Resizer('left')
resizerForLeft.initResizer()
setTimeout(handler, 10000, true); // 10s
function handler() {
resizerForCenter.stopResizer()
}body {
background-color: white;
}
#wrapper div {
/* box-sizing: border-box; */
position: relative;
float:left;
overflow: hidden;
height: 50px;
width: 50px;
padding: 3px;
}
#left {
background-color: blueviolet;
}
#center {
background-color:lawngreen ;
}
#right {
background: blueviolet;
}
#wrapper {
border: 5px solid hotpink;
display: inline-block;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Resizer v0.0.1</title>
</head>
<body>
<div id="wrapper">
<div id="left">Left</div>
<div id="center">Center</div>
<div id="right">Right</div>
</div>
</body>
</html>回答by rajat arora
var resizeHandle = document.getElementById('resizable');
var box = document.getElementById('resize');
resizeHandle.addEventListener('mousedown', initialiseResize, false);
function initialiseResize(e) {
window.addEventListener('mousemove', startResizing, false);
window.addEventListener('mouseup', stopResizing, false);
}
function stopResizing(e) {
window.removeEventListener('mousemove', startResizing, false);
window.removeEventListener('mouseup', stopResizing, false);
}
function startResizing(e) {
box.style.width = (e.clientX) + 'px';
box.style.height = (e.clientY) + 'px';
}
function startResizing(e) {
box.style.width = (e.clientX - box.offsetLeft) + 'px';
box.style.height = (e.clientY - box.offsetTop) + 'px';
}#resize {
position: relative;
width: 130px;
height: 130px;
border: 2px solid blue;
color: white;
}
#resizable {
background-color: white;
width: 10px;
height: 10px;
cursor: se-resize;
position: absolute;
right: 0;
bottom: 0;
}<div id="resize">
<div id="resizable">
</div>