1.<select>标签的使用技巧总结
//1.动态创建select function createSelect(){ var mySelect = document.createElement("select"); mySelect.id = "mySelect"; document.body.appendChild(mySelect); } //2.添加选项option function addOption(){ //根据id查找对象, var obj=document.getElementById('mySelect'); //添加一个选项 obj.add(new Option("文本","值")); } //3.删除所有选项option function removeAll(){ var obj=document.getElementById('mySelect'); obj.options.length=0; } //4.删除一个选项option function removeOne(){ var obj=document.getElementById('mySelect'); //index,要删除选项的序号,这里取当前选中选项的序号 var index=obj.selectedIndex; obj.options.remove(index); } //5.获得选项option的值 var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号,取当前选中选项的序号 var val = obj.options[index].value; //6.获得选项option的文本 var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号,取当前选中选项的序号 var val = obj.options[index].text; //7.修改选项option var obj=document.getElementById('mySelect'); var index=obj.selectedIndex; //序号,取当前选中选项的序号 var val = obj.options[index]=new Option("新文本","新值"); //8.删除select function removeSelect(){ var mySelect = document.getElementById("mySelect"); mySelect.parentNode.removeChild(mySelect); } //9.设置select option被选中 function removeSelect(){ //向办件人员下拉列表动态添加员工 for ( var i = 0; i < json.length; i++) { var newOption = new Option(json[i].empname, json[i].empid, i); //向办件人员下拉列表添加员工信息 objDeal.options.add(newOption); //客户业务员的Id不为空 if(empbyDealEmpId!="" || empbyDealEmpId!=0){ //员工id等于下拉列表中的值,则下拉列表被选中 if(empbyDealEmpId==objDeal.options[i].value){ //判断此下拉列表被选中 objDeal.options[i].selected=true; } } } }