Javascript實現動態菜單添加

最後更新：2018-12-04 來源：互聯網

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在註冊資訊的時候，常常需要通過下拉式功能表讓使用者選擇，而且希望使用者在第一個下拉框做的選擇，影響第二個下拉框的內容。有時候，如果第一個下拉框不作出選擇，第二個下拉框根本不會頁面上顯示，為了給使用者呈現一個更清晰的頁面。

先來看看效果：

Html源碼：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>動態改變菜單</title><script type="text/javascript" src="jquery.js"></script><script type="text/javascript" src="SelectMenu.js"></script></head><body><form action="#"><br/><br/><br/>    <div class="Address">               <span class="Province">Province：            <select>                <option value="" selected="selected">Please Choose Province</option>                <option value="HeBei">HeBei</option>                <option value="ShanDong">ShanDong</option>            </select>         </span>           <span class="City" style="display:none">City：            <select>            </select>        </span>        <span class="Area" style="display:none">Area：            <select>            </select>        </span>        <br/>         <br/><span class="AddressSelect" style="display:none"></span>    </div></form></body></html>

Javascript源碼

$(document).ready(function () {        //找到三個下拉框    var ProvinceSelect = $(".Province").children("select");    var CitySelect = $(".City").children("select");    var AreaSelect = $(".Area").children("select");    var AddressSelect=$(".AddressSelect");        //給第二個下拉框註冊事件    ProvinceSelect.change(function () {        //1、擷取當前下拉框的值         var ProvinceValue = $(this).val();        //1.1隻要第一個下拉框內容有變化，第三個下拉框就要隱藏起來        AreaSelect.parent().hide();        AddressSelect.hide();AddressSelect.html("");        //2、如果值不為空白，則顯示城市下拉框         if (ProvinceValue != "") {   CitySelect.html("");                   $("<option value=''>Please Choose City</option>").appendTo(CitySelect);switch(ProvinceValue)   {//實際項目中，這個城市數組肯定是在伺服器擷取的，這裡為了簡便，我就直接自訂了一個數組                        //如果追求完美，這裡還可以加一道緩衝，防止重複擷取   case "HeBei":            var CityOfHeBei=["ShiJiaZhuang","CangZhou","LangFang"];   for(var i=0;i<CityOfHeBei.length;i++){ $("<option value='"+CityOfHeBei[i]+"'>"+CityOfHeBei[i]+"</option>").appendTo(CitySelect); } break;   case "ShanDong": var CityOfShanDon=["JiNan","DeZhou","QingDao"]; for(var i=0;i<CityOfShanDon.length;i++){ $("<option value='"+CityOfShanDon[i]+"'>"+CityOfShanDon[i]+"</option>").appendTo(CitySelect); } break;   }                 CitySelect.parent().show();           } else {            CitySelect.parent().hide();        }    }); //給第二個下拉框註冊事件 CitySelect.change(function () {var CityValue = $(this).val();AddressSelect.hide();AreaSelect.parent().hide();AddressSelect.html("");        if (CityValue != "") {   AreaSelect.html("");                   $("<option value=''>Please Choose Area</option>").appendTo(AreaSelect);switch(CityValue)   {   //實際項目中，這個區數組肯定是在伺服器擷取的，這裡為了簡便，我就直接自訂了一個數組   //如果追求完美，這裡還可以加一道緩衝，防止重複擷取   case "ShiJiaZhuang":            var AreaOfCity=["GaoXinQu","KaiFaQu","XinHuaQu"];   for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); } break;   case "CangZhou": var AreaOfCity=["XinHuaQu","YunHeQu"]; for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); } break;   case "LangFang":var AreaOfCity=["AnCiQu","GuangYangQu"];for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); }    break;   case "QingDao":            var AreaOfCity=["GaoXinQu","KaiFaQu","XinHuaQu"];   for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); } break;   case "DeZhou": var AreaOfCity=["XinHuaQu","YunHeQu"]; for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); } break;   case "JiNan":var AreaOfCity=["AnCiQu","GuangYangQu"];for(var i=0;i<AreaOfCity.length;i++){ $("<option value='"+AreaOfCity[i]+"'>"+AreaOfCity[i]+"</option>").appendTo(AreaSelect); }    break;   }                 AreaSelect.parent().show();          } else {            AreaSelect.parent().hide();        }    });AreaSelect.change(function(){var AreaValue=$(this).val();AddressSelect.html("");if (AreaValue!=""){$("<span>The Address Is --Province: "+ProvinceSelect.val()+"  City: "+CitySelect.val()+"  Area: "+AreaSelect.val()+"</span>").appendTo(AddressSelect);AddressSelect.show();//alert("The Address Is  Province: "+ProvinceSelect.val()+"  City: "+CitySelect.val()+"  Area: "+AreaSelect.val());}    })});

這裡還引用了Jquery，貌似實現這個效果，用不用都無所謂，最近為了熟悉Jquery的用法，所以就加上了。

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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