Js operation select and option (example) _ javascript skills

This article mainly introduces the example of js operations on select and option. If you need some help, please refer to it. 1. dynamically create select

The Code is as follows:

Function createSelect (){

Var mySelect = document. createElement_x ("select ");
MySelect. id = "mySelect ";
Document. body. appendChild (mySelect );
}

2. Add option

The Code is as follows:

Function addOption (){

// Search for objects by id,
Var obj = document. getElementByIdx_x ('myselect ');

// Add an option
Obj. add (new Option ("text", "value"); // This can only be valid in IE
Obj. options. add (new Option ("text", "value"); // compatible with IE and firefox
}

3. Delete All option options

The Code is as follows:

Function removeAll (){
Var obj = document. getElementByIdx_x ('myselect ');
Obj. options. length = 0;

}

4. delete an option

The Code is as follows:

Function removeOne (){
Var obj = document. getElementByIdx_x ('myselect ');

// Index. The sequence number of the option to be deleted. The sequence number of the selected option is used here.

Var index = obj. selectedIndex;
Obj. options. remove (index );
}

5. Obtain the option value.

Var obj = document. getElementByIdx_x ('myselect ');
Var index = obj. selectedIndex; // the serial number of the selected option.
Var val = obj. options [index]. value;

6. Obtain the option text

Var obj = document. getElementByIdx_x ('myselect ');
Var index = obj. selectedIndex; // the serial number of the selected option.
Var val = obj. options [index]. text;

7. Modify option

Var obj = document. getElementByIdx_x ('myselect ');
Var index = obj. selectedIndex; // the serial number of the selected option.
Var val = obj. options [index] = new Option ("new text", "new Value ");

8. Delete select

The Code is as follows:

Function removeSelect (){
Var mySelect = document. getElementByIdx_x ("mySelect ");
MySelect. parentNode. removeChild (mySelect );
}

The complete code for the entire instance is as follows:

The Code is as follows: