任何人都可以使用PHP帮我解决这个问题 [英] Can anybody help me with this problem using PHP
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问题描述
这里是代码:
< tr>< td>< / td>< td>学期:< ; / TD>
< td>< select name =semester>
< option value =选择已停用隐藏>选择学期< /选项>
< option value =1> I< / option>
< option value =2> II< / option>
< option value =3> III< / option>
< option value =4> IV< / option>
< option value =5> V< / option>
< option value =6> VI< / option>
< option value =7> VII< / option>
< option value =8> VIII< / option>
< / select>< / td>< / tr>
....
....
....
现在,当我选择任何一个特定的学期时,属于那个学期的所有卷nos都应显示在下拉列表和管理员应该能够选择所有学生或特定的选择卷(如复选框)。所以我怎么能用PHP做到这一点。任何建议
我尝试过:
这里是代码我试过了:
< tr class =row>< td>< / td>< td>学期:其中; / TD>
< td>< select name =semesterclass =box>
< option value =选择已停用隐藏>选择学期< /选项>
< option value =1> I< / option>
< option value =2> II< / option>
< option value =3> III< / option>
< option value =4> IV< / option>
< option value =5> V< / option>
< option value =6> VI< / option>
< option value =7> VII< / option>
< option value =8> VIII< / option>
< / select>< / td>< / tr>
< tr>
< td>< / td>< td>卷号< / td>
< td>
<?php
mysql_connect(localhost,root,) ;
mysql_select_db(online_report);
if(isset($ _ POST ['semester']))
{
$ sem = $ _ POST ['semester'];
$ query =从student_reg选择roll,其中semester = $ sem;
$ res = mysql_query($ query);
$ nr = mysql_num_rows($ res);
}
?>
< select>
<?php
while($ fetch = mysql_fetch_array($ res))
{
?>
< option value =<?php echo $ fetch [roll];?>><?php echo $ fetch [roll];?>< / option>
<?php
}
?>
< / select>
< / td>
< / tr>
解决方案
_POST ['semester']))
{
SEM =
_POST [ '学期'];
here is the code:
<tr><td></td><td>Semester:</td> <td><select name="semester"> <option value="" selected disabled hidden>Select Semester</option> <option value="1">I</option> <option value="2">II</option> <option value="3">III</option> <option value="4">IV</option> <option value="5">V</option> <option value="6">VI</option> <option value="7">VII</option> <option value="8">VIII</option> </select></td></tr>
....
....
....
now when i select on any of this particular semester all the roll nos belonging to that semester should display in a dropdown list and admin should be able select all students or particular roll of a choice (like checkbox). so how can i do that using php. any suggestions
What I have tried:
here is the code i have tried:
<tr class="row"><td></td><td>Semester:</td> <td><select name="semester" class="box"> <option value="" selected disabled hidden>Select Semester</option> <option value="1">I</option> <option value="2">II</option> <option value="3">III</option> <option value="4">IV</option> <option value="5">V</option> <option value="6">VI</option> <option value="7">VII</option> <option value="8">VIII</option> </select></td></tr> <tr> <td></td><td>Roll number</td> <td>
<?php mysql_connect("localhost","root",""); mysql_select_db("online_report"); if(isset($_POST['semester'])) { $sem=$_POST['semester']; $query="select roll from student_reg where semester=$sem"; $res=mysql_query($query); $nr=mysql_num_rows($res); } ?>
<select> <?php while($fetch=mysql_fetch_array($res)) { ?> <option value="<?php echo $fetch["roll"];?>"><?php echo $fetch["roll"];?></option> <?php } ?> </select> </td> </tr>
解决方案
_POST['semester'])) {
sem=
_POST['semester'];
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