用Javascript實現通過選擇週數顯示開始日和結束日
最近在一個專案中遇到一個查詢頁面,其中一個查詢條件是根據選擇的年份、月以及週數顯示選擇的該周從幾號到幾號,這樣一個需求。在網上搜索了一下,有類似的但是沒有完全一樣的,只好自己動手。思路是首先取得所選擇的該年月1號這一天是星期幾,然後算出這一週中週一的日期。以此為基點,第1周的結束日即為這一天加6,第2周的開始日為這一天加7,結束日為這一天加13,以此類推,直到推算出第5周的開始日和結束日。具體程式碼如下:
//該方法有兩個引數,date是給定的日期型引數,days是需要在該日期進行加減的天數。 //例如,add(2010-10-01,-3)返回從2010-10-01這一天往前退3天的日期即2010-09-28
function addDate(date,days){ var d=new Date(date); d.setDate(d.getDate()+days); var m=d.getMonth()+1; var tmpDate = d.getFullYear()+ "/" + m + "/" + d.getDate(); var resultDate = new Date(tmpDate); return resultDate; } //對選擇的年月轉換為YYYY-MM-dd的格式 function changeDateFormat(DateIn){ var year = 0; var month = 0; var Day = 0; var currentDate = ""; year = DateIn.getYear(); month = DateIn.getMonth() + 1; Day = DateIn.getDate(); currentDate = year + "-"; if(month > 10){ currentDate = currentDate + month + "-"; }else{ currentDate = currentDate + "0" + month + "-"; } if(Day > 10){ currentDate = currentDate + Day; }else{ currentDate = currentDate + "0" + Day; } return currentDate; } //根據選擇的周計算出本週的開始日和結束日
function weekToDate(weekNumber,strWeekDay,dateIn){
//輸出的開始日 var outputDate_1 = "";
//輸出的結束日 var outputDate_2 = "";
var tmp_date= "";
//如果選擇的年月1號這一天恰好為sunday,該周monday的日期為這一天的日期-6
if(strWeekDay == '0'){ outputDate_1 = addDate(dateIn,-6); } //如果選擇的年月1號這一天為monday,第二個引數設為0,以下以此類推。
if(strWeekDay == '1'){
outputDate_1 = addDate(dateIn,0);
}
if(strWeekDay == '2'){
outputDate_1 = addDate(dateIn,-1);
}
if(strWeekDay == '3'){
outputDate_1 = addDate(dateIn,-2);
}
if(strWeekDay == '4'){
outputDate_1 = addDate(dateIn,-3);
}
if(strWeekDay == '5'){
outputDate_1 = addDate(dateIn,-4);
}
if(strWeekDay == '6'){
outputDate_1 = addDate(dateIn,-5);
}
if(weekNumber == '1'){
outputDate_2 = dateIn;
}
if(weekNumber == '2'){
outputDate_2 = addDate(outputDate_1,+7);
}
if(weekNumber == '3'){
outputDate_2 = addDate(outputDate_1,+14);
}
if(weekNumber == '4'){
outputDate_2 = addDate(outputDate_1,+21);
}
if(weekNumber == '5'){
outputDate_2 = addDate(outputDate_1,+28);
}
if(weekNumber == '1'){
//第1周的開始日結束日計算基點都是outputDate_1,因此單獨判斷
document.getElementById("spnDate").value = changeDateFormat(outputDate_1);
temp_date = addDate(outputDate_1,+6);
document.getElementById("finishTime").value =changeDateFormat(temp_date);
}else{
//第2周以後的開始日結束日都以outputDate_2為計算基點
document.getElementById("spnDate").value = changeDateFormat(outputDate_2);
temp_date = addDate(outputDate_2,+6);
document.getElementById("finishTime").value =changeDateFormat(temp_date);
}
}
function getFromToDateOfSelectedWeek(){
var year = document.getElementById("sltYear");
var optionYear=year.getElementsByTagName("option");
var strYear = "" ;
for(var i=0;i<optionYear.length;++i)
{
if(optionYear[i].selected){
strYear = optionYear[i].text;
}
}
var month = document.getElementById("sltMonth");
var option = month.getElementsByTagName("option");
var strMonth = "" ;
for(var i=0;i<option.length;++i)
{
if(option[i].selected){
strMonth = option[i].text;
}
}
//根據選擇的年月,組合成yyyy/mm/01的日期字串
var sltDate_tmp_0 = strYear+ "/" + strMonth + "/" + "1";
//將日期字串轉換為日期型
var sltDate_tmp_1 = new Date(sltDate_tmp_0);
//取得該月1號所在的星期數
var weekDay = sltDate_tmp_1.getDay();
//獲取頁面選擇的週數
var weekNumber = document.getElementById("weekNumber");
var optionWeek=weekNumber.getElementsByTagName("option");
var strWeek = "" ;
var tmp_date= "";
var outputDate_1 = "";
var outputDate_2 = "";
for(var i=0;i<optionWeek.length;++i)
{
if(optionWeek[i].selected){
strWeek = optionWeek[i].text;
}
}
//選擇第1周時計算該年月1號這一天為monday到sunday各種可能性,返回該周monday到sunday的日期
//以下判斷以此類推
if(strWeek == '1'){
if(weekDay == '0'){
weekToDate(strWeek,'0',sltDate_tmp_1);
}
if(weekDay == '1'){
weekToDate(strWeek,'1',sltDate_tmp_1);
}
if(weekDay == '2'){
weekToDate(strWeek,'2',sltDate_tmp_1);
}
if(weekDay == '3'){
weekToDate(strWeek,'3',sltDate_tmp_1);
}
if(weekDay == '4'){
weekToDate(strWeek,'4',sltDate_tmp_1);
}
if(weekDay == '5'){
weekToDate(strWeek,'5',sltDate_tmp_1);
}
if(weekDay == '6'){
weekToDate(strWeek,'6',sltDate_tmp_1);
}
}
if(strWeek == '2'){
if(weekDay == '0'){
weekToDate(strWeek,'0',sltDate_tmp_1);
}
if(weekDay == '1'){
weekToDate(strWeek,'1',sltDate_tmp_1);
}
if(weekDay == '2'){
weekToDate(strWeek,'2',sltDate_tmp_1);
}
if(weekDay == '3'){
weekToDate(strWeek,'3',sltDate_tmp_1);
}
if(weekDay == '4'){
weekToDate(strWeek,'4',sltDate_tmp_1);
}
if(weekDay == '5'){
weekToDate(strWeek,'5',sltDate_tmp_1);
}
if(weekDay == '6'){
weekToDate(strWeek,'6',sltDate_tmp_1);
}
}
if(strWeek == '3'){
if(weekDay == '0'){
weekToDate(strWeek,'0',sltDate_tmp_1);
}
if(weekDay == '1'){
weekToDate(strWeek,'1',sltDate_tmp_1);
}
if(weekDay == '2'){
weekToDate(strWeek,'2',sltDate_tmp_1);
}
if(weekDay == '3'){
weekToDate(strWeek,'3',sltDate_tmp_1);
}
if(weekDay == '4'){
weekToDate(strWeek,'4',sltDate_tmp_1);
}
if(weekDay == '5'){
weekToDate(strWeek,'5',sltDate_tmp_1);
}
if(weekDay == '6'){
weekToDate(strWeek,'6',sltDate_tmp_1);
}
}
if(strWeek == '4'){
if(weekDay == '0'){
weekToDate(strWeek,'0',sltDate_tmp_1);
}
if(weekDay == '1'){
weekToDate(strWeek,'1',sltDate_tmp_1);
}
if(weekDay == '2'){
weekToDate(strWeek,'2',sltDate_tmp_1);
}
if(weekDay == '3'){
weekToDate(strWeek,'3',sltDate_tmp_1);
}
if(weekDay == '4'){
weekToDate(strWeek,'4',sltDate_tmp_1);
}
if(weekDay == '5'){
weekToDate(strWeek,'5',sltDate_tmp_1);
}
if(weekDay == '6'){
weekToDate(strWeek,'6',sltDate_tmp_1);
}
}
if(strWeek == '5'){
if(weekDay == '0'){
weekToDate(strWeek,'0',sltDate_tmp_1);
}
if(weekDay == '1'){
weekToDate(strWeek,'1',sltDate_tmp_1);
}
if(weekDay == '2'){
weekToDate(strWeek,'2',sltDate_tmp_1);
}
if(weekDay == '3'){
weekToDate(strWeek,'3',sltDate_tmp_1);
}
if(weekDay == '4'){
weekToDate(strWeek,'4',sltDate_tmp_1);
}
if(weekDay == '5'){
weekToDate(strWeek,'5',sltDate_tmp_1);
}
if(weekDay == '6'){
weekToDate(strWeek,'6',sltDate_tmp_1);
}
}
}
經過測試有一個bug,當2月1日是星期一併且選擇的年份是平年時,選擇2月的第5周,此時第5周的開始日已經是3月而不是2月了。例如,選擇2010年2月第5周此時,程式會顯示2010-03-1至2010-03-07。解決方法有兩種,一是當用戶選擇第5周時把月份下拉框強制設定到3月。二是,將周下拉框強制設定到第4週上,並且顯示2010-02-22至2010年02-28。經過測試有一個bug,當2月1日是星期一併且選擇的年份是平年時,選擇2月的第5周,此時第5周的開始日已經是3月而不是2月了。例如,選擇2010年2月第5周此時,程式會顯示2010-03-1至2010-03-07。解決方法有兩種,一是當用戶選擇第5周時把月份下拉框強制設定到3月。二是,將周下拉框強制設定到第4週上,並且顯示2010-02-22至2010年02-28。 經過測試有一個bug,當2月1日是星期一併且選擇的年份是平年時,選擇2月的第5周,此時第5周的開始日已經是3月而不是2月了。例如,選擇2010年2月第5周此時,程式會顯示2010-03-1至2010-03-07。解決方法有兩種,一是當用戶選擇第5周時把月份下拉框強制設定到3月。二是,將周下拉框強制設定到第4週上,並且顯示2010-02-22至2010年02-28。