Js operation select and option of examples
- 2020-03-30 01:00:08
- OfStack
1. Create a select dynamically
function createSelect(){
var mySelect = document.createElement_x("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}
2. Add options
function addOption(){
//Looking up objects by id,
var obj=document.getElementByIdx_x('mySelect');
//Add an option
obj.add(new Option(" The text "," value ")); //This only works in IE
obj.options.add(new Option("text","value")); //This is compatible with IE and firefox
}
3. Delete all options
function removeAll(){
var obj=document.getElementByIdx_x('mySelect');
obj.options.length=0;
}
4. Remove an option
function removeOne(){
var obj=document.getElementByIdx_x('mySelect');
//Index, to delete the sequence number of the option, take the sequence number of the currently selected option
var index=obj.selectedIndex;
obj.options.remove(index);
}
5. Get the value of the option
Var obj = document. GetElementByIdx_x (" mySelect ");
Var index = obj. SelectedIndex; // serial number, take the serial number of the currently selected option
Var val = obj. Options [index] value;
6. Get the text of the option
Var obj = document. GetElementByIdx_x (" mySelect ");
Var index = obj. SelectedIndex; // serial number, take the serial number of the currently selected option
Var val = obj. Options [index]. The text;
7. Modify options
Var obj = document. GetElementByIdx_x (" mySelect ");
Var index = obj. SelectedIndex; // serial number, take the serial number of the currently selected option
Var val = obj.options[index]=new Option(" new text "," new value ");
8. To delete the select
function removeSelect(){
var mySelect = document.getElementByIdx_x("mySelect");
mySelect.parentNode.removeChild(mySelect);
}
The complete code of the entire instance is as follows:
<!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(" Shanghai "))
var myOption1=document.createElement_x("option")
myOption1.setAttribute("value","100")
myOption1.appendChild(document.createTextNode(" nanjing "))
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(" Pudong new area ","101"))
sh.add(new Option(" Huangpu district ","102"))
sh.add(new Option(" Xuhui district ","103"))
sh.add(new Option(" Putuo district ","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(" Xuanwu borough ","201"))
nj.add(new Option(" baixia ","202"))
nj.add(new Option(" Xiaguan district ","203"))
nj.add(new Option(" Qixia district ","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=" According to " onclick="show()">
<input type=button value=" Compute nodes " onclick="calc()">
<input type=button value=" delete " onclick="remove()">
</body>
</html>
Improved version: add, modify, and delete option elements in select
function watch_ini(){ // The initial
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){ // increase
var word = document.createElement_x("OPTION");
word.text = f.word.value;
f.keywords.add(word);
}
However, the above method of add() is only valid in IE. In order to be compatible with FF and Opera, the above code has been improved as follows:
function watch_ini(){ // The initial
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){ // increase
var oOption=new Option(f.word.value,f.word.value);
f.keywords[f.keywords.length]=oOption;
}
The complete code of the entire instance is as follows:
<!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(){ // The initial
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){ // increase
var oOption=new Option(f.word.value,f.word.value);
f.keywords[f.keywords.length]=oOption;
}
function watch_sel(f){ // The editor
f.word.value = f.keywords[f.keywords.selectedIndex].text;
}
function watch_mod(f){ // Modify the
f.keywords[f.keywords.selectedIndex].text = f.word.value;
}
function watch_del(f){ // delete
f.keywords.remove(f.keywords.selectedIndex);
}
function watch_set(f){ // save
var set = "";
for(var i=0; i<f.keywords.length; i++){
set += f.keywords[i].text + ";";
}
confirm(set);
}
//-->
</script>
</head>
<body>
<form name="watch" method="post" action="">
<select id="MySelect" name="keywords" size="10" onchange="watch_sel(this.form)"></select><br>
<script language="javascript">
<!--
watch_ini(" I "," you "," � "," he "," she "," it "," , "); //Initial keyword
//-->
</script>
<input type="text" name="word" /><br />
<input type="button" value=" increase " onclick="watch_add(this.form);" />
<input type="button" value=" Modify the " onclick="watch_mod(this.form);" />
<input type="button" value=" delete " onclick="watch_del(this.form);" />
<input type="button" value=" save " onclick="watch_set(this.form);" />
</form>
Create an array method with a string:
<script language="javascript">
</body>
</html>
<script>
function spli(){
datastr="2,2,3,5,6,6";
var str= new Array();
str=datastr.split(",");
for (i=0;i<str.length ;i++ )
{ document.write(str[i]+"<br/>"); }
}
spli();
</script>
Today, I debugged a section of js, running well in ie, debugging errors in firefox, check the data found
Obj. add(new Option(" text "," value ")); // this only works in IE
Obj. Options. The add (new Option (" text ", "value")); // this is compatible with IE and firefox
Because of this code, in the Internet to look up the data collection of this article, real-time wenjian js