ITSE 1411 Beginning Web
JS Form Selection List Chapter 5 Discussion
Discussion
  1. Selection Lists
    • The select element creates a selection list with options from which to choose.
    • Options are created using the option element.
    • The selection list can display as a list of choices or as a drop-down menu (with or without a scroll bar).
    • The selection list may use the multiple attribute to allow the user to select more than one option.
    • The selected attribute indicates when an option is selected.
    • When the selectedIndex property contains a value of -1, no option is selected.
  2. Adding Options to a Selection List
    • The add() method does not work consistently across browsers. Therefore, to add anew option to a selection list, use the Option() constructor the same way you use the Array() constructor to create an array.
  3. Removing Options from a Selection List
    • To remove a single option from a selection list, use the remove() method of the Select object. The remaining list will reorder.
    • To remove all options from a selection list, set the length to 0.
  4. Changing Options in a Selection List
    • To change an option in a selection list, assign new values to the option's value and text properties.