web前端|js教程
元素,网页,改变
web前端-js教程
1.初次实现
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1.1 html代码
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div change width by drag
1.2 js代码
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var eleLeft = $(#myDiv).offset().left;var isMouseDown = false;var borderLen = 4; //左右边框$(#myDiv).bind({ mousedown:function(e){var ele = $(this);var rightPos = eleLeft + ele.width() + borderLen;if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ isMouseDown = true; } },mousemove:function(e){var ele = $(this);var rightPos = eleLeft + ele.width() + borderLen; $(#pos).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ ele.css(cursor,e-resize); }else{if(!isMouseDown){ele.css(cursor,auto); } }if(isMouseDown){ ele.width((e.pageX-eleLeft-borderLen)+px); //新鼠标位置-div距左-borderLen } }, mouseup:function(e){ isMouseDown = false; }});
1.3 结果
只能往左拖动使div宽度变小,往右拖动没有用!原因往右拖动鼠标mousemove事件无法被div捕获了。拖动时也很难停下来!所以得改进。
2.再次改进
$(#myDiv ele = $( rightPos = eleLeft + ele.width() +(rightPos-5 <= e.pageX && e.pageX <== ody ele = $(#myDiv rightPos = eleLeft + ele.width() +#pos).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+(rightPos-5 <= e.pageX && e.pageX <=cursor,e-resize(!cursor,auto-eleLeft-borderLen)+px); =
这次解决了上述问题,可以往右拖,并且随时可以停下来了。到这里就完成了吗?NO!
当我引入一个其他div,并且阻止mouseup事件冒泡情况怎么样呢?答案是,拖动到这个其它div上放开鼠标后无法停止下来!
$(#otherDiv).mouseup(function(e){//e.preventDefault(); //阻止默认行为e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)});
3.完美解决
拖动停止可能受到其它元素的干扰,怎么解决?想到一些弹出层点击其它其它地方隐藏的功能,让我想到了,加一个遮罩层,让mouseup事件总是可以响应,不就搞定了嘛!
$(#myDiv).bind({ mousedown:function(e){var ele = $(this);var rightPos = eleLeft + ele.width() + borderLen;if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ isMouseDown = true;//创建遮罩层,防止mouseup事件被其它元素阻止冒泡,导致mouseup事件无法被body捕获,导致拖动不能停止var bodyWidth = $(ody).width();var bodyHeight = $(ody).height(); $(ody).append(
); } }});$(ody).bind({ mousemove:function(e){var ele = $(#myDiv);var rightPos = eleLeft + ele.width() + borderLen; $(#pos).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ ele.css(cursor,e-resize); }else{if(!isMouseDown){ele.css(cursor,auto); } }if(isMouseDown){ ele.width((e.pageX-eleLeft-borderLen)+px); } }, mouseup:function(e){ isMouseDown = false; $(#mask).remove(); }});$(#otherDiv).mouseup(function(e){//e.preventDefault(); //阻止默认行为e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)});
4.完整代码和最终效果
div change width by drag
$(document).ready(function(){var eleLeft = $(#myDiv).offset().left;var isMouseDown = false;var borderLen = 4; //左右边框$(#myDiv).bind({ mousedown:function(e){var ele = $(this);var rightPos = eleLeft + ele.width() + borderLen;if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ isMouseDown = true;//创建遮罩层,防止mouseup事件被其它元素阻止冒泡,导致mouseup事件无法被body捕获,导致拖动不能停止var bodyWidth = $(ody).width();var bodyHeight = $(ody).height(); $(ody).append(
); } }});$(ody).bind({ mousemove:function(e){var ele = $(#myDiv);var rightPos = eleLeft + ele.width() + borderLen; $(#pos).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ ele.css(cursor,e-resize); }else{if(!isMouseDown){ele.css(cursor,auto); } }if(isMouseDown){ ele.width((e.pageX-eleLeft-borderLen)+px); } }, mouseup:function(e){ isMouseDown = false; $(#mask).remove(); }});$(#otherDiv).mouseup(function(e){//e.preventDefault(); //阻止默认行为 e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)}); });