本篇文章为大家展示了div标签的resize事件怎么利用JavaScript进行监听,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
/** * Created by taozh on 2017/5/6. * taozh2982@gmail.com */ var EleResize = { _handleResize: function (e) { var ele = e.target || e.srcElement; var trigger = ele.__resizeTrigger__; if (trigger) { var handlers = trigger.__z_resizeListeners; if (handlers) { var size = handlers.length; for (var i = 0; i < size; i++) { var h = handlers[i]; var handler = h.handler; var context = h.context; handler.apply(context, [e]); } } } }, _removeHandler: function (ele, handler, context) { var handlers = ele.__z_resizeListeners; if (handlers) { var size = handlers.length; for (var i = 0; i < size; i++) { var h = handlers[i]; if (h.handler === handler && h.context === context) { handlers.splice(i, 1); return; } } } }, _createResizeTrigger: function (ele) { var obj = document.createElement('object'); obj.setAttribute('style', 'display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden;opacity: 0; pointer-events: none; z-index: -1;'); obj.onload = EleResize._handleObjectLoad; obj.type = 'text/html'; ele.appendChild(obj); obj.data = 'about:blank'; return obj; }, _handleObjectLoad: function (evt) { this.contentDocument.defaultView.__resizeTrigger__ = this.__resizeElement__; this.contentDocument.defaultView.addEventListener('resize', EleResize._handleResize); } }; if (document.attachEvent) {//ie9-10 EleResize.on = function (ele, handler, context) { var handlers = ele.__z_resizeListeners; if (!handlers) { handlers = []; ele.__z_resizeListeners = handlers; ele.__resizeTrigger__ = ele; ele.attachEvent('onresize', EleResize._handleResize); } handlers.push({ handler: handler, context: context }); }; EleResize.off = function (ele, handler, context) { var handlers = ele.__z_resizeListeners; if (handlers) { EleResize._removeHandler(ele, handler, context); if (handlers.length === 0) { ele.detachEvent('onresize', EleResize._handleResize); delete ele.__z_resizeListeners; } } } } else { EleResize.on = function (ele, handler, context) { var handlers = ele.__z_resizeListeners; if (!handlers) { handlers = []; ele.__z_resizeListeners = handlers; if (getComputedStyle(ele, null).position === 'static') { ele.style.position = 'relative'; } var obj = EleResize._createResizeTrigger(ele); ele.__resizeTrigger__ = obj; obj.__resizeElement__ = ele; } handlers.push({ handler: handler, context: context }); }; EleResize.off = function (ele, handler, context) { var handlers = ele.__z_resizeListeners; if (handlers) { EleResize._removeHandler(ele, handler, context); if (handlers.length === 0) { var trigger = ele.__resizeTrigger__; if (trigger) { trigger.contentDocument.defaultView.removeEventListener('resize', EleResize._handleResize); ele.removeChild(trigger); delete ele.__resizeTrigger__; } delete ele.__z_resizeListeners; } } } }
测试代码:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Resize</title> <script src="./EleResize.js"></script> <style> html, body { margin: 0; padding: 0; width: 100%; height: 100%; } #resizeDiv { width: 60%; height: 60%; border: 1px solid red; margin: 20px; } button { margin: 20px 20px 0; } </style> </head> <body> <button onclick="addListener()">addListener</button> <button onclick="removeListener()">removeListener</button> <button onclick="resize()">resize</button> <div id="resizeDiv"></div> <script> var resizeDiv = document.getElementById('resizeDiv'); function resize() { resizeDiv.style.width = "200px"; } var listener = function () { console.log("resize"); }; function addListener() { EleResize.on(resizeDiv, listener); } function removeListener() { EleResize.off(resizeDiv, listener) } </script> </body> </html>
这里的具体实现分两类,
默认支持div的resize事件,可以直接通过div.attachEvent('onresize', handler);的方式实现
通过在div中添加一个内置object元素实现监听。
设置object元素的style使其填充满div,这样当div的size发生变化时,object的size也会发生变化。
然后监听object元素的contentDocument.defaultView(window对象)的resize事件。
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