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Use JavaScript to write year, month, and day

Source: Internet
Author: User
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<HTML> </P> <p> <pead> </P> <p> <title> </title> <br/> <MCE: script Type = "text/JavaScript"> <! -- <Br/> function Init () <br/> {<br/> var year = $ ("year "); <br/> var month = $ ("month"); <br/> var day = $ ("day "); <br/> // var mvalue = $ ("month "). value; // The value of the month mentioned <br/> //// display the year // <br/> for (VAR I = 1980; I <= 2010; I ++) <br/>{< br/> var op = New Option (I, I); <br/> year. options. add (OP ); <br/>}< br/> /// display month // <br/> for (VAR I = 1; I <= 12; I ++) <br/>{< br/> var op = New Option (I, I); <br/> month. options. add (OP); <br/>}< br/> for (VAR I = 1; I <= 31; I ++) <br/>{< br/> var op = New Option (I, I); <br/> day. options. add (OP); <br/>}< br/> function changeday () <br/>{< br/> var day =$ ("day"); <br/> var mvalue =$ ("month "). value; // The value of the month mentioned <br/> var arr1 = new array ("4", "6", "9", "11 "); <br/> var arr2 = new array ("1", "3", "5", "7", "8", "10", "12 "); <br/> /// check whether the selected value is displayed in the loop array. <br/> //// 30 days <br/> for (VAR I = 0; I <arr1.leng Th; I ++) <br/>{< br/> If (mvalue = arr1 [I]) <br/>{< br/> day. options. length = 0; // empty value <br/> for (VAR j = 1; j <= 30; j ++) <br/>{< br/> var OP1 = New Option (J, J); <br/> day. options. add (OP1 ); <br/>}</P> <p >}< br/> // 31 days // <br/> for (VAR I = 0; I <arr2.length; I ++) <br/>{< br/> If (mvalue = arr2 [I]) <br/>{< br/> day. options. length = 0; // empty value <br/> for (VAR j = 1; j <= 31; j ++) <br/>{< br/> var OP1 = new o Ption (J, J); <br/> day. options. add (OP1 ); <br/>}</P> <p >}< br/> /// // 29 days of the year of the Swiss, 28 days per year <br/> If (mvalue = 2) <br/> {<br/> var yr = $ ("year "). value; <br/> If (yr % 4 = 0 & yr % 100! = 0 | yr % 400 = 0) <br/>{< br/> day. options. length = 0; // empty value <br/> for (VAR j = 1; j <= 29; J ++) <br/>{< br/> var OP1 = New Option (J, J); <br/> day. options. add (OP1); <br/>}< br/>} else <br/>{< br/> day. options. length = 0; // empty value <br/> for (VAR j = 1; j <= 28; j ++) <br/>{< br/> var OP1 = New Option (J, J); <br/> day. options. add (OP1); <br/>}</P> <p> function $ (STR) <br/>{< br/> return document. getelementbyid (STR); <br/>}< br/> // --> </MCE: SCRIPT> <br/> </pead> </P> <p> <body onload = "Init ()"> <br/> select: <select id = "year"> </SELECT> year <select id = "month" onchange = "changeday () "> </SELECT> month <select id =" day "> </SELECT> day <br/> </body> </P> <p> </ptml> <br/>

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