js 实现二级联动

onchange 事件

<body> <select id="province" onchange="func1()"> <option value="shandong">山东</option> <option value="hebei">河北</option> <option value="beijing">北京</option> </select></body><script> function func1(){ var pro = document.getElementById("province"); console.log(pro.value) }</script>

使用字典方式添加数据

一级数据显示

<body> <select id="province" > </select></body><script> data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]}; var pro = document.getElementById("province"); for (var i in data){ var option_pro = document.createElement("option"); option_pro.innerHTML=i; pro.appendChild(option_pro); }</script>

二级数据联动 方式一

<body> <select id="province" onchange="func1(this)" > </select> <select id="city"></select></body><script> data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]}; var pro = document.getElementById("province"); var city = document.getElementById("city"); for (var i in data){ var option_pro = document.createElement("option"); option_pro.innerHTML=i; pro.appendChild(option_pro); } function func1(self){ //console.log((self.options[self.selectedIndex]).innerHTML); var choice = (self.options[self.selectedIndex]).innerHTML; var options = city.children; for (var k=0; k<options.length; k++){ city.removeChild(options[k--]); } for (var i in data[choice]){ var option_city = document.createElement("option"); option_city.innerHTML = data[choice][i]; city.appendChild(option_city); } }</script>

二级数据联动 方式二

<body> <select id="province" onchange="func1(this)" > </select> <select id="city"></select></body><script> data = {"广东省":["广州","佛山"],"北京":["海淀","廊坊"], "海南省":["三亚","海口"]}; var pro = document.getElementById("province"); var city = document.getElementById("city"); for (var i in data){ var option_pro = document.createElement("option"); option_pro.innerHTML=i; pro.appendChild(option_pro); } function func1(self){ //console.log((self.options[self.selectedIndex]).innerHTML); var choice = (self.options[self.selectedIndex]).innerHTML; city.options.length=0; for (var i in data[choice]){ var option_city = document.createElement("option"); option_city.innerHTML = data[choice][i]; city.appendChild(option_city); } }</script>

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