从下拉菜单中未选择任何内容时，如何使类中的所有值出现？

【问题标题】：How can I make all values in class appear when nothing is chosen from the drop down menu?从下拉菜单中未选择任何内容时，如何使类中的所有值出现？
【发布时间】：2013-06-17 09:04:02
【问题描述】：

请帮忙。我似乎无法让所有文件同时出现。我认为这是因为我的代码中的年份选项。就像年份选项必须至少选择一年才能起作用。我需要知道如何创建一个默认选项来显示所有年份的结果。例如2007 - 2013 年的结果。

Search.php 代码

<?php
$rpdsad=$_POST['rpdsad'];
$type=$_POST['project'];
$year=$_POST['year'];
$section=$_POST['section'];
$adviser=$_POST['adviser'];
mysql_connect('localhost','root','');
mysql_select_db('saddb');

if($rpdsad=="sad"){
/*1 query search*/
    if (empty($year) && empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($year) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($year) && empty($section)){
        $query=mysql_query("SELECT * from sadt WHERE adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><tr class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($year)){
        $query=mysql_query("SELECT * from sadt WHERE section='$section' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($section)){
        $query=mysql_query("SELECT * from sadt WHERE year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE year='$year' and section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($year) && empty($section)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($year) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($type)){
        $query=mysql_query("SELECT * from sadt WHERE section='$section' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($section)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($year)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and section='$section' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($adviser)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and section='$section' and year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*4 query search*/
    elseif(!empty($adviser) && !empty($type) && !empty($section) && !empty($year)){
        $query=mysql_query("SELECT * from sadt WHERE type='$type' and section='$section' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>SAD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['sadcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
}

/*rpd*/
elseif ($rpdsad=="rpd"){
/*1 query search*/
    if (empty($year) && empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($year) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/
/*1 query search*/
    elseif(empty($type) && empty($year) && empty($section)){
        $query=mysql_query("SELECT * from rpdt WHERE adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><tr class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($year)){
        $query=mysql_query("SELECT * from rpdt WHERE section='$section' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($section)){
        $query=mysql_query("SELECT * from rpdt WHERE year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($type) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE year='$year' and section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($year) && empty($section)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($year) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and section='$section'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*2 query search*/
    elseif(empty($section) && empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($type)){
        $query=mysql_query("SELECT * from rpdt WHERE section='$section' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($section)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($year)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and section='$section' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*3 query search*/
    elseif(empty($adviser)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and section='$section' and year='$year'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }
/*end of section*/

/*4 query search*/
    elseif(!empty($adviser) && !empty($type) && !empty($section) && !empty($year)){
        $query=mysql_query("SELECT * from rpdt WHERE type='$type' and section='$section' and year='$year' and adviser='$adviser'");
        echo "<div align=center><table cellspacing=0 cellpadding=4 class=\"tabs\"><TR class=\"sabt\"><td>RPD Code</td><td>Year</td><td>Section</td><td>Title</td><td>Type of OLS</td><td>Adviser</td><td>Group Leader</td></tr>";
        while($row=mysql_fetch_array($query)){
            echo "<tr class=\"sbat\" valign=top><td nowrap>".$row['rpdcode']."</td><td>".$row['year']."</td><td>".$row['section']."</td><td style=\"text-align: left\">".$row['title']."</td><td>".$row['type']."</td><td>".$row['adviser']."</td><td>".$row['groups']."</td><td>";
        }
        echo "</table></div><BR>";
    }

/*end of section*/
}
?>

非常感谢！

【问题讨论】：

  • 你有 Javascript 吗？并发布您的 PHP 脚本。
  • 对不起，我还是新手，所以我还是不熟悉。我正在开发我的第一个 php 程序。
  • 您应该在发帖前阅读此内容：stackoverflow.com/questions/how-to-ask
  • &lt;select class=year size=8&gt; 会做你想做的事吗？
  • @jolomercado 请发布您的程序的所有代码，并准确描述您要做什么。

标签： html drop-down-menu


【解决方案1】：

我发布了您需要的通用代码，您需要添加回显语句和查询。

<?php
$rpdsad=$_POST['rpdsad'];
$type=$_POST['project'];
$year=$_POST['year'];
$section=$_POST['section'];
$adviser=$_POST['adviser'];
mysql_connect('localhost','root','');
mysql_select_db('saddb');


/*
cases for "sad"
all empty
year
type
section
adviser
type year
type section
type adviser
year section
year adviser
section adviser
type year section
type year adviser
type adviser section
year adviser section
year section adviser type
*/

/* 
cases for "rpd"

all empty
year
section
year section

*/
if($rpdsad=="sad"){
    if(empty($type) && empty($year) && empty($section) && empty($adviser))
    {
        //all empty
    }
    elseif(!empty($type) && empty($year) && empty($section) && empty($adviser))
    {
        //type
    }
    elseif(!empty($type) && !empty($year) && empty($section) && empty($adviser))
    {
        //type and year
    }
    elseif(!empty($type) && empty($year) && !empty($section) && empty($adviser))
    {
        //type and section
    }
    elseif(!empty($type) && empty($year) && empty($section) && !empty($adviser))
    {
        //type and adviser
    }
    elseif(!empty($type) && !empty($year) && !empty($section) && empty($adviser))
    {
        //type, year and section
    }
    elseif(!empty($type) && !empty($year) && empty($section) && !empty($adviser))
    {
        //type, year and adviser
    }
    elseif(!empty($type) && empty($year) && !empty($section) && !empty($adviser))
    {
        //type, adviser and section
    }
    elseif(empty($type) && !empty($year) && empty($section) && empty($adviser))
    {
        //year
    }
    elseif(empty($type) && !empty($year) && !empty($section) && empty($adviser))
    {
        //year and section
    }
    elseif(empty($type) && !empty($year) && empty($section) && !empty($adviser))
    {
        //year and adviser
    }
    elseif(empty($type) && !empty($year) && !empty($section) && !empty($adviser))
    {
        //year, adviser and section
    }
    elseif(empty($type) && empty($year) && !empty($section) && empty($adviser))
    {
        //section
    }
    elseif(empty($type) && empty($year) && !empty($section) && !empty($adviser))
    {
        //section and adviser
    }
    elseif(empty($type) && empty($year) && empty($section) && !empty($adviser))
    {
        //adviser
    }
    else{
        //all fields 
    }
}
else{   //RPD
    if(empty($year) && empty($section))
    {
        //all empty
    }
    elseif(!empty($year) && empty($section))
    {
        //year
    }
    elseif(empty($year) && !empty($section))
    {
        //section
    }
    else{
        //all fields 
    }
}
?>

肯定有更好的方法...如果我想到它，我会更新解决方案。

您的 HTML 中还有一些语法错误，请使用 IDE 或在此处验证您的 HTML：w3c validator

【讨论】：

  • 是的，@stackErr 先生。非常感谢！
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