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JS dynamically add option and delete option (with example code)_javascript skills
JS dynamically add option and delete option (with example code)_javascript skills
1. Dynamically create select
function createSelect(){
var mySelect = document.createElement("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}
2 .Add option option
function addOption(){
//Find objects based on id,
var obj=document.getElementById('mySelect');
//Add an option
obj.add(new Option("text","value")); //This is only valid in IE
obj.options.add(new Option("text","value")); //This is compatible with IE and firefox
}
3. Remove all options option
function removeAll(){
var obj=document.getElementById('mySelect');
obj.options.length=0;
}
4. Delete an option option
function removeOne(){
var obj=document.getElementById('mySelect ');
//index, the serial number of the option to be deleted, here take the serial number of the currently selected option
var index=obj.selectedIndex;
obj.options.remove(index);
}
5. Get the value of option
var obj=document.getElementById('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.getElementById('mySelect');
var index=obj.selectedIndex; //Serial number, take the serial number of the currently selected option
var val = obj.options[index].text ;
7. Modify option option
var obj=document.getElementById('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. Delete select
function removeSelect(){
var mySelect = document.getElementById("mySelect");
mySelect.parentNode.removeChild(mySelect);
}
The complete code of the entire instance is as follows:
改进版：在select中添加、修改、删除option元素
function watch_ini(){ // 初始
for(var i=0; i
word.text = arguments[i];
watch.keywords.add(word); // watch. is form name
}
}
function watch_add(f){ // 增加
var word = document.createElement("OPTION");
word.text = f.word.value;
f.keywords.add(word);
}
但上述 add() 方法只在IE下有效，为兼容FF和Opera，对上述代码进行了一下改进，改动后代码如下：
function watch_ini(){ // 初始
for(var i=0; i
document.getElementById("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;
}
整个实例的完整代码如下：
用一个字符串创建一个数组方法:
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