问题
Is there any difference between drop down box and combo box [ HTML ]?
Actually the point is, everytime i say something like: "there is some problem with the combo box", my senior says: "that's not a combo box that is a drop down", :)
回答1:
Technically, there are no combo boxes in HTML, because the <SELECT> can't be typed into. See the Wikipedia article on Combo Box (emphasis mine):
A combo box is a commonly-used graphical user interface widget. It is a combination of a drop-down list or list box and a single-line textbox, allowing the user to either type a value directly into the control or choose from the list of existing options.
While the definition of drop-down list matches exactly what the HTML <SELECT> element does:
When activated, it displays (drops down) a list of values, from which the user may select one.
So your senior is right.
回答2:
I guess he is getting at the fact
- a combo box is a combination of an input text field and a list of options. You can type in stuff in the input field and the list should update to highlight a possible match
- a dropdown is just a list of options that drops down when you click on the arrow button. You can only choose from a list of predefined options
回答3:
A combo box should have more than one item on a predefined list always visible to the user and should either:
enable users to select a single item from the predefined list and/or type their own value;
or
enable users to select multiple items from a displayed predefined list and/or add their own value
A drop-down/drop-list box should only display and enable users to select one item from a predefined list.
回答4:
The combobox allows the user to pick a value from a predefined set or input a custom one. The dropdownlist only allows picking one of the predefined values.
来源：https://stackoverflow.com/questions/2176297/is-there-any-difference-between-drop-down-box-and-combo-box