[英]Efficiently Populating Dropdown List: Javascript vs Database (Mysql-Django)
I want to have 3 dropdown lists going like 我想有3个下拉列表
Select:State 选择:州
Select City 选择城市
Select: Restaurant 选择:餐厅
When the first dropdown list has an item selected, the "Select City" list is updated, and when the second dropdown list has an item selected, the last one is updated. 当第一个下拉列表中有一个项目被选中时,“选择城市”列表被更新,而第二个下拉列表中一个项目被选择时,最后一个列表被更新。
I am stuck between 3 approaches: 我陷入3种方法之间:
form onchange
to invoke the update method. form onchange
调用update方法。 Now how does the performance and pros/cons of each approach for hosting, VPS and PAAS compare? 现在,如何比较托管,VPS和PAAS每种方法的性能和优缺点?
For the sake of usability I would update the select boxes using Ajax calls. 为了方便起见,我将使用Ajax调用更新选择框。
Another benefit from choosing this approach would be that your application logic is mostly kept server side, which in most cases is easier to write tests for. 选择这种方法的另一个好处是,您的应用程序逻辑大部分保留在服务器端,这在大多数情况下更易于编写测试。
You could populate the first select box by querying in your view and passing the results down to your template. 您可以通过在视图中查询并将结果向下传递到模板来填充第一个选择框。 If you disable the other 2 select boxes you can active/populate them after the 1 one is selected through an ajax call.
如果禁用其他2个选择框,则可以在通过ajax调用选择1个选择框之后激活/填充它们。
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