javascript question: possible to know when option items are added to a <select> - 未名空间MITBBS历史存档

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javascript question: possible to know when option items are added to a <select>

javascript question: possible to know when option items are added to a <select># DotNet - 窗口里的风景

c*o2009-01-26 08:01

1 楼

i need to get the number of

S*k2009-01-26 08:01

2 楼

I guess the simplest way is count the number of options using javascript
when the number needs to be shown.
A tracing variable may be helpful too. It might depend on how the buttons
add/remove options. If the option is added/removed by javascript, a counter
may be declared to trace the change. If the option is added/removed in code-
behind, a hidden field may be used to keep tracing.

c*o2009-01-26 08:01

3 楼

thanks for your answer.
这些东西部分基本上是纯javascript的
只是他们要求用更新count显示当option数量变化
改变option数量的button和link很多处
而且这种select也不少，以后可能还要用
哎那我现在基本确定没有什么其他办法拉
想到的只能重新做一个类出来封装显示的span和select
结果已有的很多code要改
只能说改完后以后用有些好处
烦死!cry!为什么就没有那么一个事件呢！

counter
code-

【在 S***k 的大作中提到】

: I guess the simplest way is count the number of options using javascript
: when the number needs to be shown.
: A tracing variable may be helpful too. It might depend on how the buttons
: add/remove options. If the option is added/removed by javascript, a counter
: may be declared to trace the change. If the option is added/removed in code-
: behind, a hidden field may be used to keep tracing.