蚂蚁分类信息系统H5端增加信息发布选择城市支持字母索引和热门城市

效果如下图

实现方法
1.用到的JS库 jquery1.10 betterscroll
2.修改模板文件 m/template/post.html

  <dl class="cfix">
      <dt>城市</dt>
      <div class="form-item">
          <div class="controls controls-store controls-city">
              <input type="hidden" name="provinceid" id="provinceid" value="{$provinceid}"/>
              <input type="hidden" name="cityid" id="cityid" value="{$cityid}"/>
              <input type="hidden" name="areaid" id="areaid" value="{$areaid}"/>
              <input type="hidden" name="letter" id="letter" value="{$firstLetter}"/>

              <div class="city-wrapper">
                  <input type="text" id="city" name="city" value="{$cityname}" class="current-city" readonly="" placeholder="请选择">
                  <i class="icon-down"></i>
              </div>
              <div class="area-wrapper">
                  <input type="text" id="district" name="district" value="{$areaname}" class="current-area" readonly="" placeholder="请选择">
                  <i class="icon-down"></i>
              </div>
          </div>
      </div>



      <div class="masker hidden"></div>
      <div class="city-box hidden">
          <section class="express-city-box">
              <div class="hot-city-title">
                  <i></i>
                  <h4>热门城市</h4>
              </div>
              <div id="city-sidaber" class="city-sidaber">
                  <p>A</p><p>B</p><p>C</p><p>D</p><p>E</p><p>F</p><p>G</p><p>H</p><p>J</p><p>K</p><p>L</p><p>M</p><p>N</p><p>P</p><p>Q</p><p>R</p><p>S</p><p>T</p><p>W</p><p>X</p><p>Y</p><p>Z</p>
              </div>
              <div class="hot-city">
                  <div class="hot">
                      <!--{php $hotcities1=getHotCityByNum(8);}-->
                      <!--{loop $hotcities1 $city}-->
                        <a
                           data-value="{$city['cityname']}"
                           data-id="{$city['cityid']}"
                           data-pid="{$city['provinceid']}"
                           data-letter="{echo strtoupper(substr($city['citypy'],0,1));}"
                        >{$city['cityname']}</a>
                      <!--{/loop}-->
                  </div>
              </div>
              <article id="cityBox" class="wrappernode">
                  <section class="content">
                  </section>
              </article>
          </section>
      </div>
      <div class="area-box hidden">
          <div class="hot-city-title">
              <i></i>
              <h4>区/县</h4>
          </div>
          <ul class="citylist">
              <li class="cityitem" values=""></li>
          </ul>
      </div>


  </dl>
  

底部增加

javascript"><script src="template/js/better-scroll.js"></script>
<script src="template/js/city.js"></script>

<script language="javascript">
    var options = {
        scrollY: true,
        scrollX: true,
        mouseWheel: true,
        click: true
    }
    var wrapper = document.querySelector('.wrappernode');
    var scroll = new BScroll(wrapper, options);
    // 城市选择
    $('input[name="city"]').on('click',function(){
        $('.city-box').slideDown(500,function(){
            scroll.refresh();
        });
        $('.masker').removeClass('hidden');
        setTimeout(function(){
            var preValue = $('#letter').val();
            if(preValue) {
                var alphabet = $('.letter-title');
                alphabet.map(function (i, item) {
                    if (item.innerHTML == preValue) {
                        scroll.scrollToElement(item);
                    }
                })
            }
        },500);

    })

    $('.masker').on('click', function(){
        $('.masker').addClass('hidden');
        $('.city-box').slideUp(500);
        $('.area-box').slideUp(500);
    })
    $('.city-box .content').on('click', 'li',  function(e){
        $('input[name="city"]').val(e.target.innerHTML);
        $('#cityid').val($(this).attr('data-id'));
        $('#areaid').val("");
        $('#provinceid').val($(this).attr('data-pid'));
        $('#letter').val($(this).attr('data-letter'));
        $('input[name="district"]').val('');
        $('.city-box').slideUp(500);
        $('.masker').addClass('hidden');
    })

    $('.hot-city').on('click', 'a',  function(e){
        $(this).addClass('active');
        var hotValue = $(this).attr('data-value');
        $('input[name="city"]').val(hotValue);
        $('input[name="district"]').val('');


        $('#cityid').val($(this).attr('data-id'));
        $('#areaid').val("");
        $('#provinceid').val($(this).attr('data-pid'));
        $('#letter').val($(this).attr('data-letter'));


        $('.city-box').slideUp(500, function(){
            $('.hot-city a').removeClass('active');
        });
        $('.masker').addClass('hidden');
    })

    $('.city-sidaber').on('click',function(e){
        var value = e.target.innerHTML;
        var alphabet = $('.letter-title');
        alphabet.map(function(i,item){
            if(item.innerHTML == value){
                scroll.scrollToElement(item);
            }
        })
    })

    $('input[name="district"]').on('click',function(){
        var preValue = $('input[name="city"]').val();
        if(preValue){
            traverseArea(preValue);
            $('.area-box').slideDown(500);
            $('.masker').removeClass('hidden');
        }
    })

    $('.citylist').on('click', 'li',  function(e){
        $('input[name="district"]').val(e.target.innerHTML);
        $('#areaid').val($(this).attr('data-id'));
        //$('.n-msg-city').removeClass('tip-active').text("(必填项)");
        $('.area-box').slideUp(500);
        $('.masker').addClass('hidden');
    })
</script>

3 city.js内容

javascript">var res 
$.getJSON("./city.json", function (data){
    res = data;
    traverseCity(data);
  }) 

  function traverseCity(data) {
    var cityStr = '';
    for(var key in data){
        cityStart = `<div class="letter-title">${key}</div><ul class="item-list">`;
        var citySoon = '';
        for(var i = 0;i < data[key].length;i ++){
            var result = data[key][i].city;
            citySoon += `<li data-pid="${result.pid}" data-letter="${result.letter}" data-id="${result.code}" class="item border-bottom">${result.name}</li>`
        }
        citySoon += `</ul>`;
        cityStr += (cityStart + citySoon);
    }
    $('.content').html(cityStr);
  }
  function traverseArea (name) {
    $('.citylist').html('');
    var oArea = '';
    for(var key in res){
        for(var i = 0;i < res[key].length;i ++){
            var result = res[key][i].city;
            if( result.name == name ){
                for(var k = 0;k < result.areaList.length;k ++){
                    oArea += `
                    <li data-id="${result.areaList[k].code}" class="cityitem">${result.areaList[k].name}</li>
                    `;
                }
            }
        }
    }
    $('.citylist').html(oArea);
  }

4.PHP代码实现在m目录下生成city.json城市文件

	$allcities = get_allcities();
    $data = array();
    foreach ($allcities as $ck=>$cv){
        $tmp = array();
        $letter = strtoupper(trim($cv['firstletter']));
        $tmp['city']['name'] = trim($cv['cityname']);
        $tmp['city']['code'] = trim($cv['cityid']);
        $tmp['city']['pid']  = trim($cv['provinceid']);
        $tmp['city']['letter']  = $letter;
        $tmp['city']['areaList'] = array();

        $areaList = get_city_caches($cv['cityid']);
        if($areaList && $areaList['area']){
            $tmp1 = array();
            foreach ($areaList['area'] as $ak=>$av){
                $tmp1['name'] = $av['areaname'];
                $tmp1['code'] = $av['areaid'];
                $tmp['city']['areaList'][] = $tmp1;
            }
            unset($tmp1);
        }
        $data[$letter][] = $tmp;
        unset($tmp);
    }
    $file = MYMPS_ROOT."/m/city.json";
    file_put_contents($file,json_encode($data));