form表单回写技术java实现

本文实例为大家分享了form表单回写技术，供大家参考，具体内容如下

回写支持的java拼js的方法：

 /**
   * 回写表单
   *
   * @param mrequest
   * @return
   */
  public static string writebackmaptoform(map mrequest) {
    return writebackmaptoform(mrequest, new string[]{}, "writebackmaptoform");
  }
  /**
   * 回写表单
   *
   * @param mrequest
   * @param ignorename 定义哪些key值的input不回写
   * @return
   */
  public static string writebackmaptoform(map mrequest, string[] ignorename, string jsfunctionname) {
  mrequest.remove("checkbox_template"); //不回写列表中checkbox的值
    stringbuffer rtvalue = new stringbuffer();
    rtvalue.append(" var mform = new object();\n");
    rtvalue.append(" var indexarray = new array();\n");
    rtvalue.append(" function writebackmaptoform() {\n");
    iterator itmrequest = mrequest.keyset().iterator();
    while (itmrequest.hasnext()) {
      string tempkey = (string) itmrequest.next();
      object tempvalue = mrequest.get(tempkey);
      if (tempkey.startswith("venus") || tempkey.startswith("ranmin")) {
        continue;        
      }
      if (rmstringhelper.arraycontainstring(ignorename, tempkey)) {
        continue;        
      }
      string tempvaluenew = "";
      if (tempvalue instanceof string) { //如果是单值，直接注入
        tempvaluenew = rmstringhelper.replacestringtoscript((string)tempvalue); //从数据库中取出来以后需要转换1次
        rtvalue.append("  indexarray[indexarray.length] = \"" + tempkey + "\";\n");
        rtvalue.append("  mform[\"" + tempkey + "\"] = \"" + tempvaluenew + "\";\n");
      } else if (tempvalue instanceof string[]) { //如果是多值，放入数组
        rtvalue.append("  indexarray[indexarray.length] = \"" + tempkey + "\";\n");
        string[] myarray = (string[]) tempvalue;
        if ( tempkey.equals("cmd") ){
          tempvaluenew = rmstringhelper.replacestringtoscript(myarray[0]);
          rtvalue.append("  mform[\"" + tempkey + "\"] = \"" + tempvaluenew + "\";\n");
        } else {
          rtvalue.append("  mform[\"" + tempkey + "\"] = [");
          for (int i = 0; i < myarray.length; i++) {
            if (i > 0)
              rtvalue.append(",");
            tempvaluenew = rmstringhelper.replacestringtoscript(myarray[i]);
            rtvalue.append("\"" + tempvaluenew + "\"");
          }
          rtvalue.append("];\n");
        }
      } else if (tempvalue instanceof timestamp) { //如果是时间戳，直接注入
        if(tempvalue == null) {
          continue;
        }
        tempvaluenew = rmstringhelper.replacestringtoscript(tempvalue.tostring().substring(0,19));
        rtvalue.append("  indexarray[indexarray.length] = \"" + tempkey + "\";\n");
        rtvalue.append("  mform[\"" + tempkey + "\"] = \"" + tempvaluenew + "\";\n");
      } else if (tempvalue instanceof bigdecimal){
        tempvaluenew = rmstringhelper.replacestringtoscript(tempvalue.tostring());
    rtvalue.append("  indexarray[indexarray.length] = \""
        + tempkey + "\";\n");
    rtvalue.append("  mform[\"" + tempkey + "\"] = \""
        + tempvaluenew + "\";\n");
      } else {
        if(tempvalue != null) {
          rmstringhelper.log("在回写页面时，遇到了未知java类型:" + tempvalue);          
        }
        continue;
      }
    }
    rtvalue.append("  for(var i=0; i<indexarray.length; i++) {\n");
    rtvalue.append("   writebackvalue(indexarray[i]);\n");
    rtvalue.append("  }\n");
    rtvalue.append(" }\n");
    rtvalue.append(jsfunctionname + "();\n");
    return rtvalue.tostring();
  }
//通过此方法将request中的值放入mform对象中
var mform = new object();
 var indexarray = new array();
 function writebackmaptoform() {
  indexarray[indexarray.length] = "att_id";
  mform["att_id"] = "";
  indexarray[indexarray.length] = "businesstypeoid";
  mform["businesstypeoid"] = [""];
  indexarray[indexarray.length] = "business_type1";
  mform["business_type1"] = "";
  indexarray[indexarray.length] = "business_type2";
  mform["business_type2"] = "1";
  indexarray[indexarray.length] = "cmd";
  mform["cmd"] = "saveexaminerule";
  indexarray[indexarray.length] = "document_content";
  mform["document_content"] = "s2";
  indexarray[indexarray.length] = "file_path";
  mform["file_path"] = "";
  indexarray[indexarray.length] = "file_template";
  mform["file_template"] = "";
  indexarray[indexarray.length] = "gxl";
  mform["gxl"] = "null";
  indexarray[indexarray.length] = "owner_id";
  mform["owner_id"] = "s1";
  for(var i=0; i<indexarray.length; i++) {
   writebackvalue(indexarray[i]);
  }
 }
writebackmaptoform();
 
关键语句jsp页面中加入后输出调用js方法：
 
<script language="javascript">
<% //表单回写
  if(request.getattribute(ruleexamineconstants.request_write_back_form_values) != null) { //如果request中取出的表单回写bean不为空
    out.print(rmvohelper.writebackmaptoform((java.util.map)request.getattribute(ruleexamineconstants.request_write_back_form_values))); //输出表单回写方法的脚本
  }
 map mapt = (java.util.map)request.getattribute(ruleexamineconstants.request_write_back_form_values);
 system.out.print("infois:"+mapt.entryset());
 out.print("alert(1);");
%>
</script>
 
//上面语句实际上注入的js格式内容如：
var mform = new object();
 var indexarray = new array();
 function writebackmaptoform() {
  indexarray[indexarray.length] = "_function_id_";
  mform["_function_id_"] = "3670212500000000050";
  indexarray[indexarray.length] = "cmd";
  mform["cmd"] = "listbusinesstypepage";
  for(var i=0; i<indexarray.length; i++) {
   writebackvalue(indexarray[i]);
  }
 }
writebackmaptoform();
 
  
 
 
 
//注入后调用js回写表单方法
function writebackvalue(inputname) {
if(form.elements[inputname] == undefined) {
  return false;
}
if(form.elements[inputname].value != undefined) { 
  form.elements[inputname].value = mform[inputname];     
} 
if(form.elements[inputname].length != undefined ) { 
  var thisvalue = mform[inputname];
  if(mform[inputname][0] == undefined) {
    thisvalue = new array();
    thisvalue[thisvalue.length] = mform[inputname];             
  }
  if(form.elements[inputname].length != null) { 
    var templength = form.elements[inputname].length;
    for(var j=0; j<templength; j++) {
      var thisobj = form.elements[inputname][j];
      for(var k=0; k<thisvalue.length; k++) {
        if(thisobj.value == thisvalue[k]) { 
          if( thisobj.checked != undefined) {
            thisobj.checked = true; 
            break;                 
          } else if( thisobj.selected != undefined) {
            thisobj.selected = true;                
            break;
          }
        } else {               
          if( thisobj.checked != undefined) {
            thisobj.checked = false;  
          } else if( thisobj.selected != undefined) {
            thisobj.selected = false;                
            }  
          }
        }
      }
    }  
           
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助。