JS操作select下拉框动态变动

来源：互联网发布：python 相似度编辑：程序博客网时间：2024/05/19 01:31

1.动态创建select

function createSelect(){

var mySelect = document.createElement_x("select");

mySelect.id = "mySelect";

document.body.appendChild(mySelect);

}

2.添加选项option

function addOption(){

//根据id查找对象，

var obj=document.getElementByIdx_x('mySelect');

//添加一个选项

obj.add(new Option("文本","值"));

}

3.删除所有选项option

function removeAll(){

var obj=document.getElementByIdx_x('mySelect');

obj.options.length=0;

}

4.删除一个选项option

function removeOne(){

var obj=document.getElementByIdx_x('mySelect');

//index,要删除选项的序号，这里取当前选中选项的序号

var index=obj.selectedIndex;

obj.options.remove(index);

}

5.获得选项option的值

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val = obj.options[index].value;

6.获得选项option的文本

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val = obj.options[index].text;

7.修改选项option

var obj=document.getElementByIdx_x('mySelect');

var index=obj.selectedIndex; //序号，取当前选中选项的序号

var val = obj.options[index]=new Option("新文本","新值");

8.删除select

function removeSelect(){

var mySelect = document.getElementByIdx_x("mySelect");

mySelect.parentNode.removeChild(mySelect);

}