JS动态添加option和删除option

it2022-05-09 22

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")); //这个只能在IE中有效 obj.options.add(new Option("text","value")); //这个兼容IE与firefox }

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');

//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.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; //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.getElementById('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.getElementById("mySelect");mySelect.parentNode.removeChild(mySelect); }

整个实例的完整代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd"><html><head> <meta http-equiv="Content-Type" content="text/html"><head> <script language=JavaScript> function $(id) { return document.getElementById(id) } function show() { var selectObj=$("area") var myOption=document.createElement("option") myOption.setAttribute("value","10") myOption.appendChild(document.createTextNode("上海")) var myOption1=document.createElement("option") myOption1.setAttribute("value","100") myOption1.appendChild(document.createTextNode("南京")) selectObj.appendChild(myOption) selectObj.appendChild(myOption1) } function choice() { var index=$("area").selectedIndex; var val=$("area").options[index].getAttribute("value") if(val==10) { var i=$("context").childNodes.length-1; var remobj=$("context").childNodes[i]; remobj.removeNode(true) var sh=document.createElement("select") sh.add(new Option("浦东新区","101")) sh.add(new Option("黄浦区","102")) sh.add(new Option("徐汇区","103")) sh.add(new Option("普陀区","104")) $("context").appendChild(sh) } if(val==100) { var i=$("context").childNodes.length-1; var remobj=$("context").childNodes[i]; remobj.removeNode(true) var nj=document.createElement("select") nj.add(new Option("玄武区","201")) nj.add(new Option("白下区","202")) nj.add(new Option("下关区","203")) nj.add(new Option("栖霞区","204")) $("context").appendChild(nj) } } function calc() { var x=$("context").childNodes.length-1; alert(x) } function remove() { var i=$("context").childNodes.length-1; var remobj=$("context").childNodes[i]; remobj.removeNode(true) } </script><body><div id="context"> <select id="area" οnchange="choice()"> </select></div><input type=button value="显示" οnclick="show()"><input type=button value="计算结点" οnclick="calc()"><input type=button value="删除" οnclick="remove()"></body></html>

改进版：在select中添加、修改、删除option元素

整个实例的完整代码如下：

<!doctype html public "-//w3c//dtd html 4.0 transitional//en"><html><head><title>javascript select options text value</title><meta name="keywords" content="javascript select options text value add modify delete set"><meta name="description" content="javascript select options text value add modify delete set"><script language="javascript"></script></head><body><form name="watch" method="post" action=""><select id="MySelect" name="keywords" size="10" οnchange="watch_sel(this.form)"></select><br><script language="javascript"></script><input type="text" name="word" /><br /><input type="button" value="增加" οnclick="watch_add(this.form);" /><input type="button" value="修改" οnclick="watch_mod(this.form);" /><input type="button" value="删除" οnclick="watch_del(this.form);" /><input type="button" value="保存" οnclick="watch_set(this.form);" /></form>

用一个字符串创建一个数组方法:

</body></html> <script>functionspli(){datastr="2,2,3,5,6,6"; varstr=newArray(); str=datastr.split(","); for(i=0;i<str.length ;i++ ) {document.write(str[i]+"<br/>"); } } spli(); </script> -- 来源于互联网http://apps.hi.baidu.com/share/detail/31091794

二

</select>

动态删除select中的所有options：

document.getElementById("ddlResourceType").options.length=0;

动态删除select中的某一项option：

document.getElementById("ddlResourceType").options.remove(indx);

动态添加select中的项option:

document.getElementById("ddlResourceType").options.add(new Option(text,value));

上面在IE和FireFox都能测试成功，希望以后你可以用上。

其实用标准的DOM操作也可以，就是document.createElement，appendChild，removeChild之类的。

取值方面

function getvalue(obj)

{

var m=obj.options[obj.selectedIndex].value

alert(m);//获取value

var n=obj.options[obj.selectedIndex].text

alert(n);//获取文本

}

==============================================================================

1 检测是否有选中

if (objSelect.selectedIndex > - 1 ) {

// 说明选中

} else {

// 说明没有选中

}

2 删除被选中的项

objSelect.options[objSelect.selectedIndex] = null ;

3 增加项

objSelect.options[objSelect.length] = new Option( " 你好 " , " hello " );

4 修改所选择中的项

objSelect.options[objSelect.selectedIndex] = new Option( " 你好 " , " hello " );

5 得到所选择项的文本

objSelect.options[objSelect.selectedIndex].text;

6 得到所选择项的值

objSelect.options[objSelect.selectedIndex].value;

======================================================================

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>JS对select动态添加options操作[IE和FireFox兼容]</title>

function xlbchange(s){

switch (s){

case "1" :

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3];

var soojs_text=["精神提炼","作风设计","目标设置","理念提升"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "2" :

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3,4,5,6,7];

var soojs_text=["校徽","校训","校歌","校名字体","校史展室","宣传画册","宣传光盘","办公用品纪念品"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "3":

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2,3];

var soojs_text=["校园景观设计","校园雕塑设计","校园浮雕设计","走廊文化设计"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

case "4":

document.getElementById("lb").options.length=0;

var soojs_value=[0,1,2];

var soojs_text=["学校制度","文化活动","行为规范"];

for ( var i=0;i<soojs_value.length;i++){

var oOption = document.createElement("OPTION");

oOption.value=soojs_value[i];

oOption.text=soojs_text[i];

zpmange.lb.options.add(oOption);

}

break;

default :

document.getElementById("lb").options.length=0;

var oOption = document.createElement("OPTION");

oOption.value=0;

oOption.text="请选择作品类别";

zpmange.lb.options.add(oOption);

}

</script>

</head>

<body>

</select></p>

<p> 动态删除select中的所有options： <br />

document.getElementById("ddlResourceType").options.length=0; <br />

<br />

动态删除select中的某一项option： <br />

document.getElementById("ddlResourceType").options.remove(indx); </p>

<p> 动态添加select中的项option: <br />

document.getElementById("ddlResourceType").options.add(new Option(text,value)); </p>

<p> 上面在IE和FireFox都能测试成功，希望以后你可以用上。 <br />

其实用标准的DOM操作也可以，就是document.createElement，appendChild，removeChild之类的。 </p>

function getvalue(obj)<br />

{<br />

var m=obj.options[obj.selectedIndex].value<br />

alert(m);//获取value<br />

var n=obj.options[obj.selectedIndex].text<br />

alert(n);//获取文本<br />

}<br />

</p>

<tr>

<option selected="selected">请选择作品系统</option>

<option value="1">理念视别系统</option>

<option value="2">视觉识别系统</option>

<option value="3">环境视别系统</option>

<option value="4">行为视别系统</option>

</select>

</div></td>

<option selected="selected">请选择作品类别</option>

</select>

</div></td>

</tr>

<tr>

</tr>

</table>

</form>

</body>

</html>

转载于:https://www.cnblogs.com/zhanghongqiang/p/4097496.html

专利

最新回复(0)