How to realize simple interaction between provinces and cities with JS

This article mainly introduces "how to use JS to achieve simple provincial and municipal linkage". In daily operation, I believe many people have doubts about how to use JS to achieve simple provincial and municipal linkage. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubt of "how to use JS to achieve simple provincial and municipal linkage". Next, please follow the editor to study!

Technical analysis:

Use javascript to achieve urban secondary linkage (onchange () trigger event createTextNode () method and createElement () method and appendChild () method when the pull box changes).

Code steps:

1. First determine that the event is an onchange () event, and bind a function to the event. Write the function.

2. create a two-dimensional array.

3. Determine which province the user chooses.

4. Get the cities under the province.

5. Create a text node and an element node and add a text node to the element node.

Get the second drop-down box element and add the element node to the second drop-down box. 7. Clear the second drop-down box (if not, there will be a legacy from the previous one). Effect

The source code is as follows:

Linkage between provinces and cities