Question

Drop down autofill and week ending dates

Asked by: tim_cs

I have two drop down boxes.  The first box is the date type (Year, Month, Week) and the second should fill based on the first.  Been a long time since I've had to work with javascript so no sure what the best way to switch between them is now.  Don't want to have to reload the screen to fill the drop down box.

Also, for the Week date type I only want to fill the drop down with the weekending dates (Saturday).  Using last week as an example the date in the drop down would be 12/15/2007 and for this week it would be 12/22/2007.  What would be the best and fastest way to figure out all of the week ending dates starting from January 1st of this year and populate my drop down with them when Week is selected?

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Asked On
2007-12-17 at 09:02:23ID23028371
Tags

autofill

,

based

,

date

,

week

Topics

Cold Fusion Markup Language

,

Web Languages/Standards

,

JavaScript

Participating Experts
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Points
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Comments
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Answers

 

by: mkishlinePosted on 2007-12-18 at 09:58:26ID: 20493993

Although you'll probably need to modify the value of the option tags, I would suggest you try something like this:

<script type="text/javascript">
	function getweeks(){
		var yr = document.getElementById('year').value;
		var mon = document.getElementById('month').value;
		if(yr > 0 && mon > 0){
			var dt = new Date(yr, mon - 1, 1);
			var firstDay = dt.getDay();
			if(firstDay != 6){
				firstDay = 7 - firstDay;
				dt = new Date(yr, mon - 1, firstDay);
			}
			var monthEnd = new Date(yr, mon, 0).getDate();
 
			var weekendObj = document.getElementById('weekend');
			var tempDay, dayStr;
 
			clearSelect(weekendObj);
			for(firstDay; firstDay <= monthEnd; firstDay += 7){
				tempDay = new Date(yr, mon - 1, firstDay);
				dayStr = mon + '/' + firstDay + '/' + yr.substr(2);
				addOption(weekendObj, createOption(dayStr, dayStr));
			}
		}
	}
 
	function createOption(text,value){
		var opt = document.createElement('option');
		opt.value = value;
		opt.text = text;
		return opt;
	}
 
	var isIE = navigator.appName == "Microsoft Internet Explorer";
	function addOption(select_obj, opt_obj){
		if(isIE) select_obj.add(opt_obj);
		else select_obj.add(opt_obj,null);
	}
 
	function clearSelect(selectObj){
		while(selectObj.length > 0)
			selectObj.remove(0);
	}
</script>
 
<cfoutput>
<select name="year" id="year" onchange="getweeks();">
	<option value="0"></option>
	<cfloop index="i" from="2005" to="2010">
		<option value="#i#">#i#</option>
	</cfloop>
</select>
 
<select name="month" id="month" onchange="getweeks();">
	<option value="0"></option>
	<cfloop index="i" from="1" to="12">
		<option value="#i#">#MonthAsString(i)#</option>
	</cfloop>
</select>
 
<select name="weekend" id="weekend">
</select>
</cfoutput>

                                              
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by: tim_csPosted on 2008-01-10 at 13:04:07ID: 20631195

Got a quick question about this.  It's working for me but what is the tempDay variable created for?  I don't see it being used anywhere.  

 

by: mkishlinePosted on 2008-01-10 at 13:25:33ID: 20631386

tim,
You are absolutely right. tempDay was a holdover variable that I originally used to help build dayStr. Eventually I realized that it was unnecessary but didnt' delete it from the code I posted (as I was trying to hurry and get my code up first).  ;)
Glad it's working for you.

 

by: tim_csPosted on 2008-02-07 at 07:18:37ID: 20841404

Just wanted to follow up and mention that the if statement (if(firstDay != 6){) does not need to be in there.  The code inside the if statement needs to be there but not the if itself.  It won't work right for months such as Dec 07 where the 1st is on a Saturday.  

20120131-EE-VQP-002

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