本篇文章主要是對js 操作select與option的示例進行了介紹,需要的朋友可以過來參考下,希望對大家有所幫助
1.動態創建select 代碼如下: function createSelect(){ var mySelect = document.createElement_x("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); } 2.添加選項option 代碼如下: function addOption(){ //根據id查找對象, var obj=document.getElementByIdx_x('mySelect'); //添加一個選項 obj.add(new Option("文本","值")); //這個只能在IE中有效 obj.options.add(new Option("text","value")); //這個兼容IE與firefox } 3.刪除所有選項option 代碼如下: function removeAll(){ var obj=document.getElementByIdx_x('mySelect'); obj.options.length=0; } 4.刪除一個選項option 代碼如下: function removeOne(){ var obj=document.getElementByIdx_x('mySelect'); //index,要刪除選項的序號,這裡取當前選中選項的序號 var index=obj.selectedIndex; obj.options.remove(index); } 5.獲得選項option的值 var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序號,取當前選中選項的序號 var val = obj.options[index].value; 6.獲得選項option的文本 var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序號,取當前選中選項的序號 var val = obj.options[index].text; 7.修改選項option var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序號,取當前選中選項的序號 var val = obj.options[index]=new Option("新文本","新值"); 8.刪除select 代碼如下: function removeSelect(){ var mySelect = document.getElementByIdx_x("mySelect"); mySelect.parentNode.removeChild(mySelect); } 整個實例的完整代碼如下: 代碼如下: <!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 $(id) { return document.getElementByIdx_x(id) } function show() { var selectObj=$("area") var myOption=document.createElement_x("option") myOption.setAttribute("value","10") myOption.appendChild(document.createTextNode("上海")) var myOption1=document.createElement_x("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_x("select") sh.add(new Option("浦東新區","101")) sh.add(new Option("黃浦區","102")) sh.add(new Option("徐匯區","103")) sh.add(new Option("普陀區","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_x("select") nj.add(new Option("玄武區","201")) nj.add(new Option("白下區","202")) nj.add(new Option("下關區","203")) nj.add(new Option("棲霞區","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" onchange="choice()"> </select> </div> <input type=button value="顯示" onclick="show()"> <input type=button value="計算結點" onclick="calc()"> <input type=button value="刪除" onclick="remove()"> </body> </html> 改進版:在select中添加、修改、刪除option元素 代碼如下: function watch_ini(){ // 初始 for(var i=0; i<arguments.length; i++){ var word = document.createElement_x("OPTION"); word.text = arguments[i]; watch.keywords.add(word); // watch. is form name } } function watch_add(f){ // 增加 var word = document.createElement_x("OPTION"); word.text = f.word.value; f.keywords.add(word); } 但上述 add() 方法只在IE下有效,為兼容FF和Opera,對上述代碼進行了一下改進,改動後代碼如下: 代碼如下: function watch_ini(){ // 初始 for(var i=0; i<arguments.length; i++){ var oOption=new Option(arguments[i],arguments[i]); document.getElementByIdx_x("MySelect")[i]=oOption; } } function watch_add(f){ // 增加 var oOption=new Option(f.word.value,f.word.value); f.keywords[f.keywords.length]=oOption; } 整個實例的完整代碼如下: 代碼如下: <!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"> <!-- function watch_ini(){ // 初始 for(var i=0; i<arguments.length; i++){ var oOption=new Option(arguments[i],arguments[i]); document.getElementByIdx_x("MySelect")[i]=oOption; } } function watch_add(f){ // 增加 var oOption=new Option(f.word.value,f.word.value); f.keywords[f.keywords.length]=oOption; } function watch_sel(f){ // 編輯 f.word.value = f.keywords[f.keywords.selectedIndex].text; } functio