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javascript驗證日期輸入

Java-script Code：

/**

* DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)

// Declaring valid date character, minimum year and maximum year

var dtCh= "/";

var minYear=1900;

var maxYear=2100;

function isInteger(s){

var i;

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

// Check that current character is number.

var c = s.charAt(i);

if (((c < "0") || (c > "9"))) return false;

}

// All characters are numbers.

return true;

}

function stripCharsInBag(s, bag){

var i;

var returnString = "";

// Search through string's characters one by one.

// If character is not in bag, append to returnString.

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

var c = s.charAt(i);

if (bag.indexOf(c) == -1) returnString += c;

}

return returnString;

}

function daysInFebruary (year){

// February has 29 days in any year evenly divisible by four,

// EXCEPT for centurial years which are not also divisible by 400.

return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );

}

function DaysArray(n) {

for (var i = 1; i <= n; i++) {

this[i] = 31

if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}

if (i==2) {this[i] = 29}

}

return this

}

function isDate(dtStr){

var daysInMonth = DaysArray(12)

var pos1=dtStr.indexOf(dtCh)

var pos2=dtStr.indexOf(dtCh,pos1+1)

var strMonth=dtStr.substring(0,pos1)

var strDay=dtStr.substring(pos1+1,pos2)

var strYear=dtStr.substring(pos2+1)

strYr=strYear

if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)

if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)

for (var i = 1; i <= 3; i++) {

if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)

}

month=parseInt(strMonth)

day=parseInt(strDay)

year=parseInt(strYr)

if (pos1==-1 || pos2==-1){

alert("The date format should be : mm/dd/yyyy")

return false

}

if (strMonth.length<1 || month<1 || month>12){

alert("Please enter a valid month")

return false

}

if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){

alert("Please enter a valid day")

return false

}

if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){

alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)

return false

}

if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){

alert("Please enter a valid date")

return false

}

return true

}

function ValidateForm(){

var dt=document.frmSample.txtDate

if (isDate(dt.value)==false){

dt.focus()

return false

}

return true

}

</script>

HTML Code

<p>Enter a Date <font color="#CC0000"><b>(mm/dd/yyyy)</b></font>

</p>

<p>

</p>

</form>

posted on 2005-07-17 17:25 MingIsMe 閱讀(578) 評論(0) 編輯收藏所屬分類: 02 Script/CSS

Samuel Learning

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javascript驗證日期輸入