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javascript级联菜单的操作

时间:2015-12-18 16:09:25      阅读:150      评论:0      收藏:0      [点我收藏+]

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//1.动态创建select
function createSelect(){
    var mySelect = document.createElement("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.getElementById(‘mySelect‘);
    //添加一个选项
    obj.add(new Option("文本","值"));    //方法一:
    obj.options.add(new Option("text","value")); //方法二:
    for(var i=0;i<10;i++){
        obj.options[i]=new Option("新文本","新值");    //方法三:
    }
}

//3.删除所有选项option
function removeAll(){
    var obj=document.getElementById(‘mySelect‘);
    obj.options.length=0;
}

//4.删除一个选项option
function removeOne(){
    var obj=document.getElementById(‘mySelect‘);
    var index=obj.selectedIndex;    //index,要删除选项的序号
    obj.options.remove(index);
}

//5.获得选项option的值
var obj=document.getElementById(‘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.getElementById(‘mySelect‘);
var index=obj.selectedIndex;    
var val = obj.options[index].text;

//7.修改选项option
var obj=document.getElementById(‘mySelect‘);
var index=obj.selectedIndex;    
var val = obj.options[index]=new Option("新文本","新值");

//8.删除select
function removeSelect(){
    var mySelect = document.getElementById("mySelect");
    mySelect.parentNode.removeChild(mySelect);
}

参考http://www.cnblogs.com/duanhuajian/archive/2013/06/09/3129365.html

javascript级联菜单的操作

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原文地址:http://www.cnblogs.com/yan-ck/p/5057003.html

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