Monday, February 2, 2015
Javascript slide show
| <SCRIPT>var myPix = new Array("images/pathfinder.gif", "images/surveyor.gif", "images/surveyor98.gif"); var thisPic = 0; function processPrevious() { if (document.images && thisPic > 0) { thisPic--; document.myPicture.src = myPix[thisPic]; } } function processNext() { if (document.images && thisPic < 2) { thisPic++; document.myPicture.src = myPix[thisPic]; } } </SCRIPT> <IMG SRC="images/pathfinder.gif" NAME="myPicture"> <A HREF="javascript:processPrevious()">Previous</A> <A HREF="javascript:processNext()">Next</A> |
Javascript function determines whether a Credit Card number is "valid"
// The function determines whether a Credit Card number is "valid"
// Please note that a "valid" Credit Card number is not essentially a Credit Card in "Good Standing"
// Please note that a "valid" Credit Card number is not essentially a Credit Card in "Good Standing"
function isValidCreditCard(number) {
if (number.indexOf("-")) {
cc = number.split("-");
number = "";
for (var i = 0; i < cc.length; i++) number += cc[i];
}
if (number.indexOf("-")) {
cc = number.split("-");
number = "";
for (var i = 0; i < cc.length; i++) number += cc[i];
}
// Another Version of what was performed above using String & Array Methods
if (number.indexOf(" ")) {
cc = number.split(" ");
number = cc.join("");
}
if (number.indexOf(" ")) {
cc = number.split(" ");
number = cc.join("");
}
// OR using RegExp we can combine the above two
// number = number.replace(/-|\s/g, "");
// number = number.replace(/-|\s/g, "");
/**********************************************/
if (number.length > 19) return (false);
sum = 0; mul = 1; l = number.length;
for (i = 0; i < l; i++) {
digit = number.substring(l - i - 1, l - i);
tproduct = parseInt(digit, 10) * mul;
if (tproduct >= 10) sum += (tproduct % 10) + 1;
else sum += tproduct;
if (mul == 1) mul++;
else mul--;
}
digit = number.substring(l - i - 1, l - i);
tproduct = parseInt(digit, 10) * mul;
if (tproduct >= 10) sum += (tproduct % 10) + 1;
else sum += tproduct;
if (mul == 1) mul++;
else mul--;
}
if ((sum % 10) == 0) return (true);
else return (false);
}
else return (false);
}
Javascript Jump list Choose A Page and Jump:
<FORM>selectedIndex is the "Index number" that the user "chose" notice that the <SELECT> tag has a bunch of options -- hence an Array of Options the Options all have a value & that value is a URL location.href = URL is where we will end up going to <SELECT onChange="location.href=options[selectedIndex].value"> <OPTION VALUE="index.htm">Select a Page</OPTION> <OPTION VALUE="crossword.htm">Crossword Puzzle</OPTION> <OPTION VALUE="email.htm">E-mail Address Check</OPTION> <OPTION VALUE="banner1.htm">Random Banner</OPTION> <OPTION VALUE="quotes.htm">Random Quotes</OPTION> <OPTION VALUE="rollover.htm">Rollover Example</OPTION> </SELECT> </FORM> |
Javascript Clock Military or Civilian Time?
<SCRIPT>
var now; function showMilitaryTime() { |
| if (document.theForm.showMilitary[0].checked) { |
| return true; |
| } |
| return false; |
| } |
function showTheHours(theHour) { |
| if (showMilitaryTime() || (theHour > 0 && theHour < 13)) { |
| return (theHour); |
| } |
| if (theHour == 0) { |
| return (12); |
| } |
| return (theHour - 12); |
| } |
function showZeroFilled(inValue) { |
| if (inValue > 9) { |
| return ":" + inValue; |
| } |
| return ":0" + inValue; |
| } |
function showAmPm() { |
| if (showMilitaryTime()) { |
| return (""); |
| } |
| if (now.getHours() < 12) { |
| return (" am"); |
| } |
| return (" pm"); |
| } |
function showTheTime() { |
| now = new Date(); |
| document.theForm.showTime.value = showTheHours(now.getHours()) + showZeroFilled(now.getMinutes()) + showZeroFilled(now.getSeconds()) + showAmPm(); |
| setTimeout("showTheTime()", 1000); |
| } |
</SCRIPT>
<BODY onLoad="showTheTime();">
| <FORM NAME="theForm"> |
| <INPUT TYPE="TEXT" NAME="showTime"> |
| Display Military Time? |
| <INPUT TYPE="RADIO" NAME="showMilitary" CHECKED>Yes |
| <INPUT TYPE="RADIO" NAME="showMilitary">No |
| </FORM> |
Javascript Calculating the sum of the digits
<SCRIPT>
function sumDigits(num) {
var i, sum = 0; // can declare two variables at once
var i, sum = 0; // can declare two variables at once
for (i = 1; i <= num; i++) {
sum += i; // add each number to sum (ie, 1 + 2 + ...+ num)
}
sum += i; // add each number to sum (ie, 1 + 2 + ...+ num)
}
// Display result
alert("The sum of the digits from 1 to "+ num + " is:\n\n\t " + sum);
}
alert("The sum of the digits from 1 to "+ num + " is:\n\n\t " + sum);
}
</SCRIPT>
<BODY>
Looping Functions - Calculate the sum of the digits.
<FORM NAME="SumNums">
The sum of the digits from 1 to:
<INPUT TYPE="text" NAME="charNum">
<INPUT TYPE="button" VALUE="Calculate"
onClick="sumDigits(SumNums.charNum.value)">
</FORM>
The sum of the digits from 1 to:
<INPUT TYPE="text" NAME="charNum">
<INPUT TYPE="button" VALUE="Calculate"
onClick="sumDigits(SumNums.charNum.value)">
</FORM>
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