Implement the winform control on the webpage: ComboBox

In fact, there are many ready-made comboboxes implemented using JavaScript, including Ms, but I still like to do it myself. First look at the figure:

The word "combo" means "Combination", so ComboBox should be more than just an input + drop-down. Therefore, when designing a plug-in, I considered using the plug-in mode. Each plug-in is called a provider. Its function is to implement the functions in the drop-down window. Therefore, in the future, more extensions can be provided for this ComboBox, such as the drop-down of the tree structure and date selection. ComboBox comes with a default provider, which implements the basic functions of ComboBox in winform.

Anyone who has used the ComboBox control in winform knows that it uses three drop-down styles (dropdownstyle attribute settings in. Net:

Simple-only supports text editing, which works the same as textbox.
Dropdownlist-only drop-down options are provided. text content cannot be edited.
Dropdown-you can select from the drop-down list or edit the text content.

In addition to implementing these styles, my ComboBox controls are also extended and used more closely to the web. You can refer to the figure above. Because the time is tight, I will not write the specific description. If you are interested, you can try it online or download it directly.

The latest versions of IE7, 8, ff, and chrome are all tested and can be used in IE6, but the keyboard event seems to be a problem. Support is not considered for other browsers.

Because it has not been applied in practice, there may be a lot of things that have not been implemented or unreasonable. You are welcome to give feedback.