Alex Alex - 1 year ago 98
jQuery Question

Passing form input to jQuery as a variable (to prompt a value)

I have a form where users type in start time and end time of an event (for example in the format HH:mm, like 16:45).

<form action="time.php" method="POST">
<input type="text" name="start" /></td>
<input type="text" name="end" /></td>
<input type="submit" name="submit" value="submit" />

I would like to prompt automatically a value for end time which depends on the value typed in as start time.
Let's say I want to prompt a value (variable
) which is 100 minutes later than start time.

I am trying using jquery:

$('input[name="start"]').change(function() {
$('input[name="end"]').val("<?php echo $endTime ;?>");

The problem with the script above is that
should be stored as a variable, in order to calculate $endTime accordingly.
Maybe you have a piece of advice.

Answer Source

You can set the end input using jquery itself without using a variable.

    $('input[name="start"]').change(function() {
function computeEndTime(start){
    var hourstart = start.substr(0, start.indexOf(':'));
    var minutestart = start.substr(start.indexOf(":") + 1);
    var total = hourstart * 60 + minutestart + 100;

    var minutes = total%60;
    var hours = (total - minutes) / 60;
    return hours + ":" + minutes;
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