No-refreshing linkage menu

Analyze several common online linkage menus Algorithm Then, the complexity, efficiency, and space are compromised. 1. Static linkage, suitable for infrequently updated data, such as provincial/municipal linkage menus 2. Data Binding: Use a data source for binding and display. A. dataset/datatable/datacollect Data Source B. XML Data Source 3. XMLHTTP reads data from XML files or WebServices Currently, static linkage models and simple production scripts have been completed. If you are interested, you can encapsulate them as DOTNET controls. The above is a static demo, and a simple demo can be generated dynamically below. Note: Because the script generated is not optimized and recursion is used, it is recommended to generate a 2-7 demo. If it is too large, ie will lose response! However, the generated script has no problems and has good performance. NOTE 2: Unfortunately, the sample is not used as a sawtooth array: <. the generated script consists of two parts: Data Definition and function definition. In actual use, the script is placed in a JS, and only 2nd script segments must be retained on the page. This can greatly reduce the number of bytes used by the option in the SELECT statement for multiple levels, and reduce the page transmission pressure. Enter the level you want