HTML表单元素下拉列表及单选复选框选中和获取值

//根据值选中下拉菜单某项

function setSelectedValue(id,value){

var selectObj = document.getElementById(id);

for(i=0;i<selectObj.length;i++){

if(selectObj.options[i].value==value){

selectObj.options[i].selected = "selected";

}

}

}

//获取下拉菜单当前选择的值

function getSelectedValue(id){

var value = document.getElementById(id).value;

return value;

}

//根据值选择多个下拉选项

function setSelectedValues(id,values){

var selectObj = document.getElementById(id);

for(var i=0;i<values.length;i++){

value = values.split(",");

for(var j = 0;j<value.length;j++){

for(var k = 0;k<selectObj.length;k++){

if(selectObj.options[k].value==value[j]){

selectObj.options[k].selected = "selected";

}

}

}

}

}

//获取下拉菜单当前选中的多个值

function getSelectedValues(id){

var selectObj = document.getElementById(id);

var values = "";

for(var i = 0;i<selectObj.length;i++){

if(selectObj.options[i].selected){

var value1 = selectObj.options[i].value;

var value = value1 + ",";

values += value;

}

}

return values;

}

//根据值选中某个单选框

function setCheckedRadio(name,value){

var checkObj = document.getElementsByName(name);

for(i=0;i<checkObj.length;i++){

if(checkObj[i].value==value){

checkObj[i].checked = "checked";

if(name=="dp"&&value==5){

document.getElementById('dp3con').style.display='none';

document.getElementById('dp5con').style.display='block';

}else if(name=="dp"&&value==3){

document.getElementById('dp3con').style.display='block';

document.getElementById('dp5con').style.display='none';

}

if(name=="MsPretight"){

chooseMOrF();

}

}

}

}

//获取当前选中的单选框的值

function getCheckedRadio(name){

var radioValue= "";

       var radioObj=document.getElementsByName(name);

       for(var i=0;i<radioObj.length;i++){

           if(radioObj[i].checked==true){

              radioValue= radioObj[i].value;

              break;

           }

       }

       return radioValue;

}

 

//根据flag选中某个复选框

function setCheckedBox(id,flag){

var checkedBoxObj = document.getElementById(id);

if(flag=="true"){

checkedBoxObj.checked = "checked";

if(id=="MpIsDensityEqv"){

document.getElementById("MpEqvMass").readOnly = false;

document.getElementById("MpEqvMass").style.backgroundColor="#F0F8FF";

}

}else if(flag=="false"){

checkedBoxObj.checked = false;

}

}

//判断某个复选框的是否被选中

function getCheckedBox(id){

var flag = false;

var checkedBoxObj = document.getElementById(id);

if(checkedBoxObj.checked){

flag = true;

}

return flag;

}