澳门贵宾会娱乐官网基于Asp.net与Javascript控制的日期控件_javascript技巧_脚本之家

控件效果如下:

比如<asp:LinkButton>控件就被渲染成了<a>锚点控件,这里要讲的DropDownList控件也一样,被渲染成了普通的select控件,在如下的asp.net页面中定义了一个web服务器控件DropDownList和一个普通的select控件(主要为了对比)。
代码

从左到右:month,day,year

复制代码 代码如下:

.cs文件初始化这三个下拉列表复制代码
代码如下: private void BindBirthDay(int day, int month, int year) { int
dayNow = day; int monNow = month; int yearNow = year; //binding Month
for (int i = 1; i <= 12; i++) { ddlBirMon.Items.Add(new ListItem,
i.ToString; } ddlBirMon.Items[monNow – 1].Selected = true; //binding
Day int daysOfMonth = DateTime.DaysInMonth; for (int i = 1; i <=
daysOfMonth; i++) { ddlBirDay.Items.Add(new ListItem, i.ToString; }
ddlBirDay.Items[dayNow – 1].Selected = true; //binding Year for (int i
= 20; i > 0; i–) { ddlBirYear.Items.Add(new
ListItem.ToString.ToString; } for (int i = 0; i < 20; i++) {
ddlBirYear.Items.Add(new ListItem.ToString.ToString; }
ddlBirYear.Items.FindByValue.Selected = true; } js代码如下: 复制代码 代码如下: function ChangeDay() { var
month = document.getElementById(“”); var year =
document.getElementById(“”); var day = document.getElementById(“”); if
(month.selectedIndex == 3 || month.selectedIndex == 5 ||
month.selectedIndex == 8 || month.selectedIndex == 10) { if { if
(day.options[30].selected == true) { day.options[29].selected =
true; } day.remove; } } else{ while { day.add(new
Option(day.length+1,day.length+1)); } } if (month.selectedIndex == 1) {
if { if (day.selectedIndex == 28) { day.options[27].selected = true; }
while { day.remove; } } var sy =
year.options[year.selectedIndex].value; if ((sy % 4 == 0 && sy % 100
!= 0) || { day.add(new Option; } } }

<asp:DropDownList ID = “ddlCities” runat = “server”>
<asp:ListItem Value = “0”>长沙</asp:ListItem>
<asp:ListItem Value = “1”>北京</asp:ListItem>
<asp:ListItem Value = “2”>天津</asp:ListItem>
<asp:ListItem Value = “3”>漠河</asp:ListItem>
</asp:DropDownList>
<select id = “ddlNames” runat =”server”>
<option value = “0”>James</option>
<option value = “1”>Green</option>
<option value = “2”>Lily</option>
<option value = “3”>Lucy</option>
</select>

  在浏览器中查看该页面,并点击查看源文件,不难看出,asp.net页面被渲染成了如下格式:
代码

复制代码 代码如下:

<select name=”ddlCities” id=”ddlCitys”>
<option value=”0″>长沙</option>
<option value=”1″>北京</option>
<option value=”2″>天津</option>
<option value=”3″>漠河</option>
</select>
<select name=”ddlNames” id=”ddlNames”>
<option value=”0″>James</option>
<option value=”1″>Green</option>
<option value=”2″>Lily</option>
<option value=”3″>Lucy</option>
</select>

  好了,接下来介绍一下要用javascript操纵DropDownList控件,首先得了解select(或者DropDownList)的两个最基本的属性,一个是value属性,一个是text属性,还有一个selectedIndex属性,用来标识当前选中的项(数字),具体可参见上面的示例代码。
下面正式言归正传,主要介绍如下几点:
(1) 清空DropDownList控件中的值。
  
document.getElementById(‘ddlCities’).options.length = 0;
(2) 判断DropDownList中是否有value为’Param1’的ListItem。

复制代码 代码如下:

function isListItemExist(objDdl , objItemValue)
{
var isExist = false;
for(var i in objSelect.options)
  {
    if(i.value == objItemValue)
    {
      isExist = true;
      break;
    }
  }
  return isExist;
}

JavaScript与DropDownList
服务器控件DropDownList和Javascript的之间的传递

复制代码 代码如下:

<script language=”javascript”>
function hehe()
{
document.all(‘txtSdept’).value
=document.all(‘ddlSdept’).options[document.all(‘ddlSdept’).selectedIndex].text;
}
</script>
<asp:DropDownList id=”ddlSdept” style=”Z-INDEX: 101; LEFT: 240px;
POSITION: absolute; TOP: 112px” onchange=”hehe()” runat=”server”>
<asp:ListItem Value=”1″>计算机系</asp:ListItem>
<asp:ListItem Value=”2″>机械系</asp:ListItem>
<asp:ListItem Value=”3″>电子系</asp:ListItem>
<asp:ListItem Value=”4″>英语系</asp:ListItem>
<asp:ListItem Value=”5″>中文系</asp:ListItem>
</asp:DropDownList>
<asp:TextBox id=”txtSdept” style=”Z-INDEX: 102; LEFT: 48px; POSITION:
absolute; TOP: 112px” runat=”server”></asp:TextBox>

参考文章:

复制代码 代码如下:

<meta http-equiv=”Content-Type” content=”text/html;
charset=gb2312″>
<title>无标题文档</title>
<script language=”javascript”>
function moveSelected(select, down)
{
if (select.selectedIndex != -1)
{
if (down)
{
if (select.selectedIndex != select.options.length – 1)
var i = select.selectedIndex + 1;
else
return;
}
else
{
if (select.selectedIndex != 0)
var i = select.selectedIndex – 1;
else
return;
}
var swapOption = new Object();
swapOption.text = select.options[select.selectedIndex].text;
swapOption.value = select.options[select.selectedIndex].value;
swapOption.selected = select.options[select.selectedIndex].selected;
swapOption.defaultSelected =
select.options[select.selectedIndex].defaultSelected;
for (var property in swapOption)
select.options[select.selectedIndex][property] =
select.options[property];
for (var property in swapOption)
select.options[property] = swapOption[property];
}
}
<form id=”formName” name=”formName” >
<select name=”selectName” id=”selectName” size=”8″>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
</select>
<input id=”moveUp” onclick=”moveSelected(this.form.selectName,
false)” type=”button” value=”上移” />
<input id=”moveDown” onclick=”moveSelected(this.form.selectName,
false)” type=”button” value=”下移” />
</form>

1、js脚本如何访问服务器控件的值
界面上有一个TextBox控件,ID为Name,js里可以采用如下脚本取Name的值
var myvalue=document.all(‘Name’).value;
2、服务器控件如何取js中变量的值
目前未发现比较好的办法,我通常采用的方法是在界面上放一个隐藏的控件HtmlInputHidden,然后设置为以服务器控件运行,这样在js脚本中和ASP.NET代码里都可以访问到该控件的值
js中给服务器控件赋值:
var bt=document.all(‘Name’).value;
bt.value=’名称’;
ASP.NET中使用Name.Value来访问。
3、如何遍历界面上所有TextBox元素

复制代码 代码如下:

var inputList = document.body.getElementsByTagName(“INPUT”);
for(var i=0;i<inputList.length;i++)
{
if(inputList.disabled==false && (inputList.type==’text’ ||
inputList.type==’password’))
{
inputList.value=””;
}
}

4、让dropdownlist选择到指定项
选择dropdownlist中值为“我得选择”得项

复制代码 代码如下:

var handl=document.all(‘List1’);
var my_value=’我得选择’;
for(var index=0;index<handle.options.length;index++)
{
if(handle.options[index].text==my_value)
{
handle.selectedIndex=index;
}
}

JS取消ListBox,Select,DropDownList选项的选中

复制代码 代码如下:

<asp:ListBox ID=”ListBox1″ runat=”server”>
<asp:ListItem Text=”1″ Value=”1″></asp:ListItem>
<asp:ListItem Text=”2″ Value=”2″></asp:ListItem>
<asp:ListItem Text=”3″ Value=”3″></asp:ListItem>
<asp:ListItem Text=”4″ Value=”4″></asp:ListItem>
<asp:ListItem Text=”5″ Value=”5″></asp:ListItem>
</asp:ListBox>
<script language=”javascript” type=”text/javascript”>
$(document).ready(function(){
$(“#cel”).click(function(){
$(“#<%=ListBox1.ClientID%>”).get(0).selectedIndex=-1;
});
});
</script>
<div id=”cel” style=”cursor:pointer;”>取消绑定</div>

dropdownlist 选中值
c#:

复制代码 代码如下:

ddlProvince.SelectedIndex =
ddlProvince.Items.IndexOf(ddlProvince.Items.FindByText( “浙江”));
javascript:
var requiredSdept=$(“select[@id=’ddlSdept’]
option[@selected]”).val();
var requiredSdept = $(“#ddlSdept option[@selected]”).text();
var select1 = document.all.<%= ddlSdept.ClientID %>;
var select1value = select1.options[select1.selectedIndex].value;
var select1Text = select1.options[select1.selectedIndex].innerText;
其中select1Text 为选中的值。如果在模态窗口中使用,可以用如下代码:
window.returnValue=select1Text;//这是返回给父窗体的值
window.close();

javascript中设定dropdownlist哪一项为当前选中项
方法1:
i = 2
document.all.dropdownlistID.options[i].selected=true
方法2:
obj.selectedIndex = 2;
方法3:
obj.value=”你要设的数值。”//Dropdownlist就会自动把那个值设为当前。
javascript清除dropdownlist的项

复制代码 代码如下:

//清除原有项
function clearitem(){
var drp1 = document.getElementById(“drp1”);
while(drp1.options.length>0)
{
drp1.options.remove(0);
}
}

动态更改方法(根据城市代码取得该市商业区并添加到DropDownList中)

复制代码 代码如下:

function getsyq()
{
var city =
document.getElementById(“DropDownList_Cities”).value;  //取得城市代码
var htp = new ActiveXObject(“Msxml2.XMLHTTP”);
var drp1 = document.getElementById(“drp1”); 
var url = “?stat=1&city=”+city  
htp.open(“post”,url,true)
htp.onreadystatechange=function()
{
if(htp.readyState==4)
{
   clearitem(); //清除原有下拉项
var str = htp.responseText;
var opt = str.split(‘,’);
var s = opt.length
for(var j = 0;j<s;j++)
{
var newOption = document.createElement(“OPTION”);   //定义一个新的项
var ff = opt[j].split(‘|’);
   newOption.text = ff[1];
   newOption.value = ff[1];
   drp1.options.add(newOption);
  }
}
}
htp.send()
}

JavaScript实现DropDownList(Select)三级联动无刷新

复制代码 代码如下:

<script language=javascript>
function CountryChange(){
countryid=document.getElementById(“ddlContry”).value;
if(countryid==null||countryid==””){
alert(“请选择所属国家”);
CountryDel(“ddlProvince”);//清空DropDownList
CountryDel(“ddlCity”);//清空DropDownList
return false;
}
var countrystring=””;
var
posturl=location.protocol+”//”+location.hostname+”//soleweb//AjaxEnjine//AreaShow.aspx?AreaId=”+countryid;
countrystring=openUrl(posturl);
if(countrystring==”-2″){//查询失败
alert(“数据查询失败”);
return false;
}
//分割并写入DropDownList
CountryDel(“ddlProvince”);//清空DropDownList
CountryDel(“ddlCity”);//清空DropDownList
if(countrystring==””){
return false;
}
var stringarray=countrystring.split(“|”);
for(var i=0;i<stringarray.length;i++){//重写DropDownList
//拆分内部数组
var optionarray=stringarray[i].split(“,”);
var newoption=document.createElement(“option”);
newoption.text=optionarray[0];
newoption.value=optionarray[1];
document.getElementById(“ddlProvince”).options.add(newoption);  
}
}
function CountryDel(AreaName){//清空DropDownList
var countnum=document.getElementById(AreaName).options.length;
for(var i=1;i<countnum;i++){//清空DropDownList
document.getElementById(AreaName).remove(countnum-i);
}
}
function ProvinceChange(){
countryid=document.getElementById(“ddlProvince”).value;
if(countryid==null||countryid==””){
alert(“请选择所属省”);
CountryDel(“ddlCity”);//清空DropDownList
return false;
}
var countrystring=””;
var
posturl=location.protocol+”//”+location.hostname+”//soleweb//AjaxEnjine//AreaShow.aspx?AreaId=”+countryid;
countrystring=openUrl(posturl);
if(countrystring==”-2″){//查询失败
alert(“数据查询失败”);
return false;
}
//分割并写入DropDownList
CountryDel(“ddlCity”);//清空DropDownList
if(countrystring==””){
return false;
}
澳门贵宾会娱乐官网,var stringarray=countrystring.split(“|”);
for(var i=0;i<stringarray.length;i++){//重写DropDownList
//拆分内部数组
var optionarray=stringarray[i].split(“,”);
var newoption=document.createElement(“option”);
newoption.text=optionarray[0];
newoption.value=optionarray[1];
document.getElementById(“ddlCity”).options.add(newoption);  
}
}
function openUrl(url)
{
var objxml=new ActiveXObject(“Microsoft.XMLHttp”)
objxml.open(“GET”,url,false);
objxml.send();
retInfo=objxml.responseText;
if (objxml.status==”200″)
{
return retInfo;
}
else
  {
return “-2”;
}
}
</script>

Html代码

复制代码 代码如下:

<asp:DropDownList ID=”ddlContry” runat=”server”
onchange=”CountryChange()”
OnSelectedIndexChanged=”ddlContry_SelectedIndexChanged”>
<asp:ListItem Value=” “>请选择所属国家</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID=”ddlProvince” runat=”server”
onchange=”ProvinceChange()”
OnSelectedIndexChanged=”ddlProvince_SelectedIndexChanged”>
<asp:ListItem Value=” “>请选择所属省</asp:ListItem>
</asp:DropDownList>
<asp:DropDownList ID=”ddlCity” runat=”server”>
<asp:ListItem Value=” “>请选择所属市</asp:ListItem>
</asp:DropDownList>

Aspx.cs代码

复制代码 代码如下:

protected void Page_Load(object sender, EventArgs e)
{
SoLe.Common.StringFormat sft = new SoLe.Common.StringFormat();
string AreaId =
sft.Html_Fn(Request.QueryString[“AreaId”].ToString());
StringBuilder AreaString = new StringBuilder();
AreaString.Append(“”);
if (!Page.IsPostBack)
{
//Response.Write(AreaIdValid(AreaId.ToString()));
SoLe.BLL.AreaTable bll = new SoLe.BLL.AreaTable();
DataSet ds = new DataSet();
ds = bll.GetList(” PaterId=” + AreaId.ToString()+” “);
if (!object.Equals(ds, null) && ds.Tables[0].Rows.Count > 0) {
for (int i = 0; i < ds.Tables[0].Rows.Count; i++) {
if (string.IsNullOrEmpty(AreaString.ToString()))
{
AreaString.Append(ds.Tables[0].Rows[i][“Title”].ToString() + “,” +
ds.Tables[0].Rows[i][“Id”].ToString());
}
else {
AreaString.Append(“|” + ds.Tables[0].Rows[i][“Title”].ToString() +
“,” + ds.Tables[0].Rows[i][“Id”].ToString());
}
}
}
}
Response.Write(AreaString.ToString());
}

JavaScript分割字符串装载到DropDownList
假设变量str存放着几组对应的数据,DropDownList名为ddlType,把字符分隔后的数据装载到ddlType,具体代码如下:
程序代码

复制代码 代码如下:

<script language=”javascript”>
function LoadType() {
var str = “1|网页|2|图片|3|企业|4|资讯|”;
var temp = str.split(“|”);
var count = (temp.length – 1) / 2;
for (var i = 0; i <= count; i++) {
document.all(“ddlType”).options.add(new Option(temp[i], temp[i +
1]));
}
return;
}
<script>

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