禁用和启用其他输入

Question

我的代码的设计方式是，一个字段中的输入将确定是否启用下一个字段，以至于如果第一个输入什么都没有输入，它将禁用其他输入标签，从而禁用其他输入标签输入本身。我的问题是最后一个输入“ text3”将没有id传递给函数，并且将该变量声明为null，我如何才能为其赋予一个“ fakeID”。 PS：请记住我是javascript新手。

<select id="text1" onchange="getIDDataChange(this.id)">
                <option></option>
                <option value="0">default</option>
            </select>
            <input type="text" id="text2" onkeyup="getIDDataChange(this.id)" disabled="disabled">

            <input type="text" id="text3" onkeyup="getIDDataChange(this.id)" disabled="disabled">


            <script language="javascript">

                function getIDDataChange(givenID){
                    var idArray = ['text2', 'text3']
                    if (givenID == "text1"){
                        validChange(givenID,idArray[0],idArray[1]);
                    }
                    if (givenID == "text2"){
                        validChange(givenID,idArray[1]);
                        //the last ID is a problem as there is no value for the third id in validChange()
                    }
                }//gives variables to the change function

                function validChange(firstID,secondID,thirdID) {
                    var type = document.getElementById(firstID).type;
                    var min = 0;
                      if(type == "select-one")//if the box entered into is select
                           {
                            if (document.getElementById(firstID).value != "") {
                                document.getElementById(secondID).disabled = false;
                           }
                          else{
                                document.getElementById(secondID).disabled = true;
                                document.getElementById(thirdID).disabled = true;
                              //disables inputs after itself if the firstID is empty
                          }
                      }
                      else if(type == "text")//if the box entered into is text
                          {
                            if (document.getElementById(firstID).value.length > min){
                                document.getElementById(secondID).disabled = false;
                                //enables the element after itself
                       }
                            else{
                                document.getElementById(secondID).disabled = true;
                                document.getElementById(thirdID).disabled = true;
                                //disables inputs after itself if the firstID is empty
                          }
                      }
                }

                //once input from text1 is entered launch this function 
            </script>