how to compare two date

[jimmyweb]

Hi friends,
I created a simple javascript to validate start and end date.
if start date less than end date, system will display an error message.
But it does not wotking. however, alert function display correct date.
Thanks for any help!
Jim
******** codes
<script language="JavaScript">
function checkEntry() {
alert(document.optSel.p_startdt.value );
alert(document.optSel.p_enddt.value);
if (document.optSel.p_startdt.value > document.optSel.p_enddt.value
{
alert("Please enter start date less than end date");
document.optSel.p_startdt.focus();
return false;
}
else
{
return true;
}
}
</script>

 

[dwarfthrower]

You'd want to firstly put the values from the fields into JavaScript [tt]Date()[/tt] objects.

//Put the start date field into a date object
var strStartDate = document.optSel.p_startdt.value;
var dtStartDate = new Date(Date.parse(strStartDate));

And, of course, do the same for the end date.

Then, as JavaScript stores date values as an integer number of milliseconds, you can subtract one from the other and look at the result.

//compare two dates
if(dtStartDate <= dtFinishDate){
 alert("Congratulations, you pass logic 101.");
}
else{
 alert("Hmmm... not so sure about that.");
}

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[jimmyweb]

Hi dwarfthrower,
Thanks for your email. it works. But why do we need to use Date.parse....

Jim

 

[jimmyweb]

HiFriends and dwarfthrower,
Do we have any wey to highlight that input text box?
selected is only for checkbox?
any ideal?
Thanks for any help?
Jim

 

[jemminger]

Jim,
>> "Do we have any wey to highlight that input text box?"
use the select() method on an input to select the contents of that input.

e.g.

var box = document.getElementById("myFormId").myInputField;
box.select();

-jeff

http://www.jeffemminger.com

try { succeed(); } catch(E) { tryAgain(); } finally { rtfm(); }
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