要解决的问题
1.如果纯文字的条目信息,可以立即获取到高度信息,很简单就可以搞定,麻烦的是内容里有图片,图片高度未知,直接通过jquery的height()方法获取到的高度不准确,有时是默认的高度,导致在分配位置的时候多个分配到同一列去,不均匀。
2.绝对定位分配位置是一种方法,但是每个位置都要去计算,如果布局修改,要修改很多地方。
3.显示的时候顺序问题,由于检测图片信息是在setTimeout里单独执行,如果最先检测到的就显示会引起显示问题,如果所有检测完一起显示会引起页面一时的空白。
解决的办法
1.检测到图片高度信息的时候立即执行位置分配(imageready)。
2.瀑布流虽然在行上不规则,但在列上是很规则的,有几条流就用几个ul。新分配的添加到对应的ul里。
3. 按照列表的顺序显示,通过递归回调,检测完一条信息后执行递归,直至显示完当前前10条。
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src="./qd/201506/W020150612589700442591.jpg" width="350"/></a> </li> </ul> <script src="./js/jquery-1.7.1.min.js"></script> <script type="text/javascript"> var imgReady = (function() { var list = [], intervalId = null, tick = function() { var i = 0; for (; i < list.length; i++) list[i].end ? list.splice(i--, 1) : list[i](); !list.length && stop(); }, stop = function() { clearInterval(intervalId); intervalId = null; }; return function(url, ready, load, error) { var onready, width, height, newWidth, newHeight, img = new Image(); img.src = url; if (img.complete) { ready.call(img); load && load.call(img); return; }; width = img.width; height = img.height; img.onerror = function() { error && error.call(img); onready.end = true; img = img.onload = img.onerror = null; }; onready = function() { newWidth = img.width; newHeight = img.height; console.log(newWidth + ‘,‘ + newHeight) if (newWidth !== width || newHeight !== height || newWidth * newHeight > 1024) { ready.call(img); onready.end = true; }; }; onready(); img.onload = function() { !onready.end && onready(); load && load.call(img); img = img.onload = img.onerror = null; }; if (!onready.end) { list.push(onready); if (intervalId === null) intervalId = setInterval(tick, 40); }; }; })(); function Col(opts){ this.container=$("#"+opts.id); this.curHeight=opts.height||0; } function ListItem(opts){ this.container=$("#"+opts.container); this.colArrs=[]; this.model=opts.model||null; } ListItem.prototype={ init:function(){ this.render(); }, setModel:function(model){ this.model=model; this.renderList(); }, getMinOne:function(){ var temp=this.colArrs[0].curHeight,min=0; for(var i=0;i<this.colArrs.length;i++){ if(temp>this.colArrs[i].curHeight){ temp=this.colArrs[i].curHeight; min=i; } } return this.colArrs[min]; }, render:function(){ this.renderStruct(); this.renderList(); }, renderStruct:function(){ this.container.html(‘<div class="waterfall"><ul class="water-col" id="one"></ul><ul class="water-col" id="two"></ul></div>‘); this.colArrs[0]=new Col({id:"one",height:0}); this.colArrs[1]=new Col({id:‘two‘,height:0}); }, renderList:function(){ var length=this.model.length; var model=this.model; var tempContainer=null; for(var i=0;i<length;i++){ tempContainer=this.getMinOne(); //console.log(tempContainer); tempContainer.container.append(model[i]); tempContainer.curHeight+=$(model[i]).height(); } }, destroy:function(){ //unbind } }; var modelArr=getModelArr(0,10); var colApp=new ListItem({ model:modelArr.node, container:"main" }); setTimeout(function(){ var temp=getModelArr(1,10); loadImg(temp.img,function(){ colApp.setModel(temp.node); }); //colApp.setModel(getModelArr(1,10)); },2000); setTimeout(function(){ var temp=getModelArr(2,10); loadImg(temp.img,function(){ colApp.setModel(temp.node); }); //colApp.setModel(getModelArr(1,10)); },4000); function getModelArr(start,num){ var temp=[],i=0,url=[]; var lists=$("ul li"); var end=0,src; if(start*num<lists.length){ i=start*num; num=(lists.length-start*num)>num?num:lists.length-start*num; end=i+num; // console.log(i+"----"+end+"----"+lists.length); }else{ return null; } lists.each(function(index,element){ if(index>=i&&index<end){ temp.push(element); src=$(element).find(‘img‘); if(src){ url.push(src.attr("src")); } //console.log(i+"=="+index); } }); return {‘node‘:temp,‘img‘:url}; } </script> </body> </html>
上面代码中的图片路径需要统一替换下
/* v1.1版本中用的所有的图片信息获取到后在执行添加,low function loadImg(urls,callback){ var count=0; for(var m=0;m<urls.length;m++){ imgReady(urls[m],function(){ count++; if(count==urls.length){ callback(); } },function(){ },function(){ count++; if(count==urls.length){ callback(); } }); } } loadImg(modelArr.img,function(){ colApp.init(); }); colApp.init(); //colApp.setModel(modelArr); setTimeout(function(){ colApp.setModel(getModelArr(1,10)); },2000); setTimeout(function(){ colApp.setModel(getModelArr(2,10)); },4000); */
时间: 2024-10-18 14:06:58