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)}); });