Dynamically create and delete select, add and delete option options, obtain the option value, and obtain the option text. If you are interested, refer to section 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 "));
}
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.
The Code is as follows:
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
The Code is as follows:
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
The Code is as follows:
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 );
}