我们经常要给用户作出多项选择进行处理,例如允许用户对列表项选择多项后删除选定项等。今天举个例子说明PHP和JavaScript分别是怎样处理多项选择的。今天我们做的是一个投票系统,对MySQL数据库itemtable表里的项目进行投票,且每个别IP能且只能投两票。
表itemtable是通过以下MySQL语句建立的:
CREATE TABLE `itemtable` (
`id` TINYINT( 4 ) NOT NULL AUTO_INCREMENT,
`name` VARCHAR( 50 ) NOT NULL ,
`votes` SMALLINT( 6 ) NOT NULL ,
PRIMARY KEY ( `id` )
);
其中字段“name”是列表项目名,“votes”是所得票数。我们还要建立一个表“voteiptable”来记录投票用户的IP:
CREATE TABLE `voteiptable` (
`id` SMALLINT( 6 ) NOT NULL ,
`voteip` VARCHAR( 15 ) NOT NULL,
PRIMARY KEY ( `id` )
);
下面我们编写文件“multivote.php”,今天我们要用到一个数据库类文件“dbclass.php”.
我们可以发现,客户端的JavaScript和服务器端的PHP对多项选择的处理有很多相似之处,当然也有不同。这是比较经典的多选项处理的程序,如果不限定用户的选项的话就更简单了。

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