编辑servlet，显示从数据库中选择的dropwdown值

7fyelxc5 于 2021-06-20 发布在 Mysql

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我想显示选中的dropwdown值，这样管理员就可以编辑表单而不必再次选择值。我尝试了这个代码，但它不会工作，值没有显示选定的值，它需要管理员重新选择，而不是..有任何错误吗？你们谁能建议一些代码或修复我的？

pw.println("<div class=\"form-group\">");
    pw.println("<label class=\"control-label col-lg-2\">Employment Type <span class=\"required\">*</span></label>");
    pw.println("<div class=\"col-lg-10\">");
    pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
    "<option value=\"\" selected disabled>Please Select...</option> \n " +
    "<option value=\"Permanent\">Permanent</option> \n " +
    "<option value=\"Contract\">Contract</option> \n " +
    "<option value=\"Temporary\">Temporary</option> \n " +
    "<option value=\"Part Time\">Part Time</option>");
    pw.println("</select>");
    pw.println("</div>");
    pw.println("</div>");

Java mysql servlets web-applications drop-down-menu

来源：https://stackoverflow.com/questions/50984644/edit-servlet-that-display-the-selected-dropwdown-value-from-database

2条答案

按热度按时间

cld4siwp1#

好了终于明白了哈哈哈

pw.println("<div class=\"form-group\">");
   pw.println("<label class=\"control-label col-lg-2\">Employment Type <span class=\"required\">*</span></label>");
   pw.println("<div class=\"col-lg-10\">");

   if(!"".equalsIgnoreCase(j.getJobemptype()) && j.getJobemptype()!=null){

        if(j.getJobemptype().equalsIgnoreCase("Permanent")){

            pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
               "<option value='"+ j.getJobemptype() +"'>"+j.getJobemptype()+"</option>\n " +
               "<option value=\"Contract\">Contract</option> \n " +
               "<option value=\"Temporary\">Temporary</option> \n " +
               "<option value=\"Part Time\">Part Time</option>");
            pw.println("</select>");

        }else if(j.getJobemptype().equalsIgnoreCase("Contract")){

            pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
               "<option value='"+ j.getJobemptype() +"'>"+j.getJobemptype()+"</option>\n " +
               "<option value=\"Permanent\">Permanent</option> \n " +
               "<option value=\"Temporary\">Temporary</option> \n " +
               "<option value=\"Part Time\">Part Time</option>");
            pw.println("</select>");
        }else if(j.getJobemptype().equalsIgnoreCase("Temporary")){

            pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
               "<option value='"+ j.getJobemptype() +"'>"+j.getJobemptype()+"</option>\n " +
               "<option value=\"Permanent\">Permanent</option> \n " +
               "<option value=\"Contract\">Contract</option> \n " +
               "<option value=\"Part Time\">Part Time</option>");
            pw.println("</select>");

        }else if(j.getJobemptype().equalsIgnoreCase("Part Time")){

                            pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
                              "<option value='"+ j.getJobemptype() +"'>"+j.getJobemptype()+"</option>\n " +
                              "<option value=\"Permanent\">Permanent</option> \n " +
                              "<option value=\"Contract\">Contract</option> \n " +
                              "<option value=\"Temporary\">Temporary</option>");
                            pw.println("</select>");

                            }
                              }else {
                                pw.println("<select class=\"form-control m-bot15\" name=\"j_empType\" value='"+ j.getJobemptype() +"' required/> \n " +
                                  "<option value=\"Permanent\">Permanent</option> \n " +
                                  "<option value=\"Contract\">Contract</option> \n " +
                                  "<option value=\"Temporary\">Temporary</option> \n " +
                                  "<option value=\"Part Time\">Part Time</option>");
                                pw.println("</select>");
                                  }
    pw.println("</div>");
    pw.println("</div>");

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zqdjd7g92#

我不明白你的代码，因为它是一个有点未格式化和无用的。我想你的意思是：

for(MyEnum e : MyEnum.values()){
      pw.println("<option value=\""+e.name()+"\">"e.name()"</option>");
}

?

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编辑servlet，显示从数据库中选择的dropwdown值

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