I have created a drop down that works as a calendar in javascript. I am trying to set up a button so that when it is clicked the id ‘date’ will display the currently selected year, month, and day. But the button does nothing. I believe I have the function set up properly, but it isn’t working and I suspect it is placed incorrectly. Can someone please help edit my code to make this work??
Feel free to play around with my jsfiddle.. http://jsfiddle.net/FQnEy/
Here is what I have tried…
<html>
<head>
<title>Life Event Picker Calendar</title>
</head>
<body>
<div id="date">Date</div>
<div id="event">Event</div>
Life Event Picker Calendar<br>
<hr align="left" width="200px"/>
--Year ------ Month ----- Day<br>
<div id="calendar-container"></div>
<br>Event: <input type="text" name="evname" /><br />
<button onclick="getInfo()"type="button">Click Me!</button>
<script type="text/javascript">
function getInfo() {
document.getElementById("date").innerHTML = sel_year.value + sel_month.value + sel_day.value;
}
(function() {
//variables and values for years
var yr1 = 2011, yr2 = 2012, yr3 = 2013, yr4 = 2014;
var years = [yr1, yr2, yr3, yr4];
//array with months and associated days
var calendar = [
["January", 31],["February", 28],["March", 31],["April", 30],["May", 31],["June", 30],["July", 31],["August", 31],["September", 30],
["October", 31],["November", 30],["December", 31]],
//this is the variable that accesses the content
cont = document.getElementById('calendar-container');
//creates the element variables for the drop downs
var sel_year = document.createElement('select'), sel_month = document.createElement('select'), sel_day = document.createElement('select');
function createOption(txt, val) {
//this creates the option but it seems that it is making the value -1 than what the text node is
var option = document.createElement('option');
option.value = val;
option.appendChild(document.createTextNode(txt));
return option;
}
//creates the values and text drop down values for years
function createYearOption(val) {
var option = document.createElement('option');
option.value = val;
option.appendChild(document.createTextNode(val));
return option;
}
//this clears any elements for days, months, years
function clearChildren(ele) {
while (ele.hasChildNodes()) {
ele.removeChild(ele.lastChild);
}
}
//this function is only triggered when you recalculate the months
function recalculateDays() {
var year_index = sel_year.value;
var month_index = sel_month.value,
df = document.createDocumentFragment();
if ((month_index == 1) && (year_index % 4 == 0)) {
for (var i = 0, l = calendar[month_index][1]; i < l + 1; i++) {
//the first variable is what number will be displayed in the day drop down
df.appendChild(createOption(i + 1, i + 1));
}
} else {
//l is the variable for the number of days in the month from the array above ex:28, 30, 31
for (var i = 0, l = calendar[month_index][1]; i < l; i++) {
//the first variable is what number will be displayed in the day drop down
df.appendChild(createOption(i + 1, i + 1));
}
}
clearChildren(sel_day);
sel_day.appendChild(df);
}
//this function is triggered only when you change the year
function recalculateDays2() {
var month_index = sel_month.value,
df = document.createDocumentFragment();
year_index = sel_year.value;
//this checks to see if the month selected is Feb and the year is a leap year
if ((month_index == 1) && (year_index % 4 == 0)) {
//l is the variable for the number of days in the month from the array above ex:28, 30, 31
for (var i = 0, l = calendar[month_index][1]; i < l + 1; i++) {
//the first variable is what number will be displayed in the day drop down
df.appendChild(createOption(i + 1, i + 1));
}
//if not a leap year and not Feb give values of normal year to all months
} else {
for (var i = 0, l = calendar[month_index][1]; i < l; i++) {
//the first variable is what number will be displayed in the day drop down
df.appendChild(createOption(i + 1, i + 1));
}
}
clearChildren(sel_day);
sel_day.appendChild(df);
}
//this creates the month values
function generateMonths() {
var df = document.createDocumentFragment();
for(var i=0; i<calendar.length; i++) {
df.appendChild(createOption(calendar[i][0], i));
}
//clears past months
clearChildren(sel_month);
//appends new months onto variable df
sel_month.appendChild(df);
}
//this creates the year values
function generateYears() {
var df = document.createDocumentFragment();
for(var i=0; i<years.length; i++) {
df.appendChild(createYearOption(years[i]));
}
//clears past months
clearChildren(sel_year);
//appends new months onto variable df
sel_year.appendChild(df);
}
//anytime the month selector is changed this calls the function to change the days
sel_month.onchange = recalculateDays;
sel_year.onchange = recalculateDays2;
//runs the months and days functions
generateMonths();
generateYears();
recalculateDays();
//this is what displays each of the individual drop downs after everything has been done to them
cont.appendChild(sel_year);
cont.appendChild(sel_month);
cont.appendChild(sel_day);
}());
</script>
</body>
</html>
The scope of your year, month and day variables was wrong. You need to pull them out as in this jsFiddle example.