最近好多天没有更新文章，是因为公司的项目忙的不行。今天有点时间，就突然想起在移动端项目中遇到三级联动的问题，网上查了很多资料，都是依赖各种插件，或者晦涩难于理解。于是，自己决定写一个出来。 当然，没有用到别的插件类库，也没有用ajax。写完这个小demo也学到不少，现在分享给大家代码。因为代码较多，我就不一个个解释了，源码里面添加了很多注释。 为了便于大家使用，我将html精简了许多。
结尾会有在线运行地址。
| 0 | <!DOCTYPE html> |
| 1 | <html lang="en"> |
| 2 | <head> |
| 3 | <meta charset="UTF-8"> |
| 4 | <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> |
| 5 | <meta name="apple-mobile-web-app-capable" content="yes"> |
| 6 | <title>三级联动</title> |
| 7 | <link rel="stylesheet" href="index.css"> |
| 8 | </head> |
| 9 | <body> |
| 10 | <div class="select"> |
| 11 | 请选择区域 |
| 12 | </div> |
| 13 | <script src="city.js"></script> |
| 14 | <script src="index.js"></script> |
| 15 | </body> |
| 16 | </html> |
至于三级联动的数据，我重新定义了一个js文件，在文件中创建了一个json对象，复制了服务器的三级联动的数据过来。 下面是javascript代码
| 0 | (function(){ |
| 1 | |
| 2 | var sel = document.querySelector('.select'), |
| 3 | createDivFlag = true; |
| 4 | windowHeight = window.screen.availHeight, |
| 5 | startYFlag = 0; |
| 6 | |
| 7 | var div,cur,province,city,county,ok,resut,oneNum,twoNum,threeNum,touchFlag, |
| 8 | touchOn = true, |
| 9 | touchStop = true, |
| 10 | tochBegin = true; |
| 11 | |
| 12 | //判断是否能打开 |
| 13 | sel.addEventListener('touchend',function(){ |
| 14 | |
| 15 | createDivFlag && createDiv(); |
| 16 | |
| 17 | }) |
| 18 | |
| 19 | //开始生成盒子 |
| 20 | function createDiv(){ |
| 21 | |
| 22 | //判断避免重复生成 |
| 23 | if(!div){ |
| 24 | div = document.createElement('div'), |
| 25 | cur = document.createElement('div'), |
| 26 | ok = document.createElement('div'), |
| 27 | resut = document.createElement('div'), |
| 28 | province = document.createElement('div'), |
| 29 | city = document.createElement('div'), |
| 30 | county = document.createElement('div'); |
| 31 | |
| 32 | div.className = 'win'; |
| 33 | cur.className = 'current'; |
| 34 | ok.className = 'ok'; |
| 35 | resut.className = 'resut'; |
| 36 | province.className = 'province'; |
| 37 | city.className = 'city'; |
| 38 | county.className = 'county'; |
| 39 | |
| 40 | ok.innerHTML = '完成'; |
| 41 | resut.innerHTML = '取消'; |
| 42 | |
| 43 | //赋值translate |
| 44 | province.style.transform = 'translateY(80px)'; |
| 45 | city.style.transform = 'translateY(80px)'; |
| 46 | county.style.transform = 'translateY(80px)'; |
| 47 | //给三个盒子绑定滑动事件 |
| 48 | touchGo([province,city,county]); |
| 49 | div.appendChild(cur); |
| 50 | div.appendChild(ok); |
| 51 | div.appendChild(resut); |
| 52 | div.appendChild(province); |
| 53 | div.appendChild(city); |
| 54 | div.appendChild(county); |
| 55 | document.body.appendChild(div); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | //填充数据 |
| 60 | fillIn(province,city,county); |
| 61 | |
| 62 | |
| 63 | setTimeout(function(){ |
| 64 | div.style.transform = 'translateY(-200px)'; |
| 65 | },0); |
| 66 | |
| 67 | //确认选择 |
| 68 | ok.addEventListener('touchend',function(){ |
| 69 | |
| 70 | var one = province.querySelectorAll('span')[oneNum], |
| 71 | two = city.querySelectorAll('span')[twoNum] || null, |
| 72 | three = county.querySelectorAll('span')[threeNum] || null, |
| 73 | selId, |
| 74 | oneHtml, |
| 75 | twoHtml, |
| 76 | threeHtml; |
| 77 | |
| 78 | oneHtml = one.innerHTML || ''; |
| 79 | twoHtml = two ? two.innerHTML : ''; |
| 80 | threeHtml = three ? three.innerHTML : ''; |
| 81 | |
| 82 | sel.innerHTML = oneHtml + twoHtml + threeHtml; |
| 83 | |
| 84 | |
| 85 | oneNodeValue = one ? one.attributes['data-id'].nodeValue : ''; |
| 86 | twoNodeValue = two ? two.attributes['data-id'].nodeValue : ''; |
| 87 | threeNodeValue = three ? three.attributes['data-id'].nodeValue : ''; |
| 88 | selId = oneNodeValue + twoNodeValue + threeNodeValue + ''; |
| 89 | |
| 90 | sel.setAttribute('data-id',selId); |
| 91 | |
| 92 | div.style.transform = 'translateY(0)'; |
| 93 | |
| 94 | createDivFlag = true; |
| 95 | |
| 96 | }) |
| 97 | |
| 98 | //取消选择 |
| 99 | resut.addEventListener('touchend',function(){ |
| 100 | |
| 101 | div.style.transform = 'translateY(0)'; |
| 102 | |
| 103 | createDivFlag = true; |
| 104 | |
| 105 | }) |
| 106 | |
| 107 | createDivFlag = false; |
| 108 | |
| 109 | } |
| 110 | |
| 111 | |
| 112 | |
| 113 | //给三级菜单填充内容 |
| 114 | function fillIn(province,city,county){ |
| 115 | var proStart,cityStart; |
| 116 | |
| 117 | //先将内容清空，避免后面累加 |
| 118 | province.innerHTML = ''; |
| 119 | city.innerHTML = ''; |
| 120 | county.innerHTML = ''; |
| 121 | |
| 122 | //初始化位置 |
| 123 | for(k in region.p['000000']){ |
| 124 | var span = document.createElement('span'); |
| 125 | span.setAttribute("data-id",k); |
| 126 | span.innerHTML = region.p['000000'][k]; |
| 127 | province.appendChild(span); |
| 128 | } |
| 129 | |
| 130 | proStart = province.querySelector('span').attributes['data-id'].nodeValue; |
| 131 | |
| 132 | cityBegin(proStart,city); |
| 133 | |
| 134 | cityStart = city.querySelector('span').attributes['data-id'].nodeValue; |
| 135 | |
| 136 | countyBegin(cityStart,county); |
| 137 | |
| 138 | //初始化时自动先获取一遍初始值 |
| 139 | for(var i = 0; i < arguments.length; i += 1){ |
| 140 | |
| 141 | //判断第二次打开，是否需要渲染二三级 |
| 142 | if(arguments[i].querySelector('span')){ |
| 143 | |
| 144 | selectCity(arguments[i]); |
| 145 | |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | } |
| 150 | |
| 151 | //二级内容 |
| 152 | function cityBegin(proStart,city){ |
| 153 | var flag = true; |
| 154 | |
| 155 | if(region.c[proStart]){ |
| 156 | |
| 157 | for(n in region.c[proStart]){ |
| 158 | var span = document.createElement('span'); |
| 159 | span.setAttribute('data-id',n); |
| 160 | span.innerHTML = region.c[proStart][n]; |
| 161 | city.appendChild(span); |
| 162 | } |
| 163 | |
| 164 | }else{ |
| 165 | flag = false; |
| 166 | } |
| 167 | |
| 168 | return flag; |
| 169 | |
| 170 | } |
| 171 | |
| 172 | |
| 173 | //三级内容 |
| 174 | function countyBegin(cityStart,county){ |
| 175 | for(j in region.d[cityStart]){ |
| 176 | var span = document.createElement('span'); |
| 177 | span.setAttribute('data-id',j); |
| 178 | span.innerHTML = region.d[cityStart][j]; |
| 179 | county.appendChild(span); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | |
| 184 | //为三级菜单绑定拓展事件 |
| 185 | function touchGo(objArr){ |
| 186 | |
| 187 | for(var i = 0; i < objArr.length; i += 1){ |
| 188 | |
| 189 | actionSwiper(objArr[i]); |
| 190 | |
| 191 | } |
| 192 | |
| 193 | //为三级菜单绑定事件 |
| 194 | function actionSwiper(obj){ |
| 195 | |
| 196 | var startPosition,movePosition,endPosition,deletaY,transY; |
| 197 | |
| 198 | //tochBegin,touchOn,touchStop;三个状态判断 |
| 199 | obj.addEventListener('touchstart',function(event){ |
| 200 | if(touchStop){ |
| 201 | touchStop = false; |
| 202 | var touch = event.touches[0]; |
| 203 | startPosition = { |
| 204 | x : touch.pageX, |
| 205 | y : touch.pageY |
| 206 | } |
| 207 | transY = Number(translateXY(obj)); |
| 208 | objHeight = obj.offsetHeight; |
| 209 | tochBegin = true; |
| 210 | } |
| 211 | |
| 212 | }) |
| 213 | |
| 214 | |
| 215 | //80 为两个span的高度，初始化时，距离上方80px |
| 216 | //200 为自定义select的高度。 |
| 217 | obj.addEventListener('touchmove',function(event){ |
| 218 | |
| 219 | if(tochBegin){ |
| 220 | |
| 221 | touchOn = true; |
| 222 | |
| 223 | var touch = event.touches[0]; |
| 224 | |
| 225 | movePosition = { |
| 226 | x : touch.pageX, |
| 227 | y : touch.pageY |
| 228 | }; |
| 229 | |
| 230 | deletaY = movePosition.y - startPosition.y + transY; |
| 231 | |
| 232 | //向上划上限 |
| 233 | //deletaY = deletaY > -objHeight - 80 + 200 ? deletaY : -objHeight - 80 + 200; |
| 234 | deletaY = deletaY > -objHeight + 120 ? deletaY : -objHeight + 120; |
| 235 | |
| 236 | //向下滑下限 |
| 237 | deletaY = deletaY > 80 ? 80 : deletaY; |
| 238 | |
| 239 | |
| 240 | obj.style.transform = 'translateY('+ deletaY +'px)'; |
| 241 | |
| 242 | //禁止浏览器默认黑色背景出现 |
| 243 | event.preventDefault(); |
| 244 | |
| 245 | |
| 246 | } |
| 247 | |
| 248 | }) |
| 249 | |
| 250 | obj.addEventListener('touchend',function(){ |
| 251 | |
| 252 | if(touchOn){ |
| 253 | |
| 254 | touchStop = true; |
| 255 | |
| 256 | var touch = event.changedTouches[0]; |
| 257 | |
| 258 | endPosition = { |
| 259 | x : touch.pageX, |
| 260 | y : touch.pageY |
| 261 | }; |
| 262 | |
| 263 | setTimeout(function(){ |
| 264 | objTouchEnd(obj); |
| 265 | },100); |
| 266 | |
| 267 | } |
| 268 | |
| 269 | }) |
| 270 | |
| 271 | //滑动结束后处理函数 |
| 272 | function objTouchEnd(obj){ |
| 273 | |
| 274 | var objTranslateY = parseInt(Number(translateXY(obj))), |
| 275 | objType = '', |
| 276 | timer = null; |
| 277 | |
| 278 | if(endPosition.y - startPosition.y > 0){ |
| 279 | objType = 'down'; |
| 280 | }else{ |
| 281 | objType = 'up'; |
| 282 | } |
| 283 | |
| 284 | timer = setInterval(function(){ |
| 285 | |
| 286 | |
| 287 | if(objType == 'up'){ |
| 288 | if(Number(translateXY(obj)) % 40 != 0){ |
| 289 | objTranslateY -= 1; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | if(objType == 'down'){ |
| 294 | if(Number(translateXY(obj)) % 40 != 0){ |
| 295 | objTranslateY += 1; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | obj.style.transform = 'translateY('+ objTranslateY +'px)'; |
| 300 | |
| 301 | if(Number(translateXY(obj)) % 40 == 0){ |
| 302 | |
| 303 | clearInterval(timer); |
| 304 | timer = null; |
| 305 | |
| 306 | tochBegin = false; |
| 307 | |
| 308 | //确定选择 |
| 309 | selectCity(obj); |
| 310 | |
| 311 | } |
| 312 | |
| 313 | |
| 314 | },20); |
| 315 | |
| 316 | |
| 317 | |
| 318 | } |
| 319 | |
| 320 | } |
| 321 | |
| 322 | } |
| 323 | |
| 324 | |
| 325 | //获取设置选项 |
| 326 | function selectCity(obj){ |
| 327 | //80+80=160 Y为80 的时候是第一个 |
| 328 | var objTranslateY = Number(translateXY(obj)), |
| 329 | one, |
| 330 | oneId, |
| 331 | onText, |
| 332 | two, |
| 333 | twoId, |
| 334 | twoText, |
| 335 | three, |
| 336 | threeId, |
| 337 | threeText, |
| 338 | twoGoThree; |
| 339 | |
| 340 | if(obj == province){ |
| 341 | |
| 342 | oneNum = Math.abs((objTranslateY + 80 - 160) / 40); |
| 343 | |
| 344 | //获取序号 |
| 345 | one = province.querySelectorAll('span')[oneNum]; |
| 346 | |
| 347 | //获取自定义属性值 |
| 348 | oneId = one.attributes['data-id'].nodeValue; |
| 349 | |
| 350 | //清空下一级内容 |
| 351 | city.innerHTML = ''; |
| 352 | |
| 353 | //重置下一级translateY |
| 354 | city.style.transform = 'translateY(80px)'; |
| 355 | |
| 356 | //重置第三级translateY |
| 357 | county.style.transform = 'translateY(80px)'; |
| 358 | |
| 359 | //填充下一级内容 |
| 360 | twoGoThree = cityBegin(oneId,city); |
| 361 | |
| 362 | //清空第三项 |
| 363 | county.innerHTML = ''; |
| 364 | |
| 365 | //默认第三级默认第二级第一项 |
| 366 | if(twoGoThree){ |
| 367 | countyBegin(city.querySelector('span').attributes['data-id'].nodeValue,county); |
| 368 | } |
| 369 | |
| 370 | } |
| 371 | |
| 372 | if(obj == city){ |
| 373 | |
| 374 | twoNum = Math.abs((objTranslateY + 80 - 160) / 40); |
| 375 | |
| 376 | //获取序号 |
| 377 | two = city.querySelectorAll('span')[twoNum]; |
| 378 | |
| 379 | //获取选中选项自定义属性值 |
| 380 | twoId = two.attributes['data-id'].nodeValue; |
| 381 | |
| 382 | //清空第三项值 |
| 383 | county.innerHTML = ''; |
| 384 | |
| 385 | //重置第三项translateY |
| 386 | county.style.transform = 'translateY(80px)'; |
| 387 | |
| 388 | //填充第三项 |
| 389 | if(twoId){ |
| 390 | countyBegin(twoId,county); |
| 391 | } |
| 392 | |
| 393 | } |
| 394 | |
| 395 | if(obj == county){ |
| 396 | |
| 397 | threeNum = Math.abs((objTranslateY + 80 - 160) / 40); |
| 398 | |
| 399 | //获取序号 |
| 400 | three = county.querySelectorAll('span')[threeNum]; |
| 401 | |
| 402 | //获取选中选项自定义属性值 |
| 403 | threeId = three.attributes['data-id'].nodeValue; |
| 404 | |
| 405 | } |
| 406 | |
| 407 | } |
| 408 | |
| 409 | //获取translateY值 |
| 410 | function translateXY(obj){ |
| 411 | var beeTransform = obj.style.transform.replace(/s/g,''); |
| 412 | beeTransform = beeTransform.replace('translateY',''); |
| 413 | beeTransform = beeTransform.slice(1,-1); |
| 414 | beeTransform = beeTransform.replace('px',''); |
| 415 | return beeTransform; |
| 416 | } |
| 417 | |
| 418 | })() |
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