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网页上下降的违约值
原标题:default value of dropdown on webpage

这一点可能难以解释。 我已经建立了一个时间表系统,雇员可以插入自己的时间表记录。 这项工程课以罚款,但是,一夫一妻给他们选择用一个项目,因此,从我手提的所有项目数字来看,已经出现下降,但是,我还要确定项目数目的下降的违约价值,在项目编号上加进记录(即避免忘记项目是什么)。

我的守则是:

$result1 = mysql_query("select project_no from `projects`") or die(mysql_error());
            echo  <select name="project" class="project"> ;
        while($row1 = mysql_fetch_array($result1)){
            echo "<option selected= yes  value=".$row1[ project_no ].">".$row1[ project_no ]."</option>";
        }
            echo  </select> ;

记录储存在一个称为时间表的表格中,因此,从中可以做一个“选举”项目,但不能确定如何将正确的项目编号确定为上述下降的违约值?

这是否有意义?

最佳回答

将项目编号储存在一个变量,如projnum,并与每个数值进行比较。

$result1 = mysql_query("select project_no from `projects`") or die(mysql_error());
            echo  <select name="project" class="project"> ;
        while($row1 = mysql_fetch_array($result1)){
            echo "<option ";
            if ($row1[ project_no ] == $projnum) { echo  selected="selected"; }
            echo " value=".$row1[ project_no ].">".$row1[ project_no ]."</option>";
        }
            echo  </select> ;
问题回答
    $project_to_select = 42;

    while($row1 = mysql_fetch_array($result1)){
        echo "<option " . ($row1[ project_no ] == $project_to_select ? "selected= selected " : "") . " value=".$row1[ project_no ].">".$row1[ project_no ]."</option>";
    }

变化

selected= yes 

To

selected= selected 




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