Develop Reference

Javascript. Add array to datetime input

I have a form with datetime_local html5 datetime input so that mobile users can use their native datetime picker instead of a jquery substitute which is generally clunkier.
I want the user to be able to select multiple dates.
So far I'm using the onchange trigger to capture the selected datetime and add it to an array. I then try and paste the array into the datetime input so it can be sent with the form.
With one date, it pastes fine, with more than one the input goes blank.
var datearray = [];
$(document).on('change','#mobile_gig_date',function(){
var date = $("#mobile_gig_date").val();
datearray.push(date);
console.log(datearray.join('; '))
$("#mobile_gig_date").val(datearray);
});
The HTML element is;
<input min="2017-09-01T00:00:00" discard_seconds="true" placeholder="Enter the gig date" id="mobile_gig_date" type="datetime-local" name="gig[date]">
Is there a way to add an array to a datetime input, and if so, in what format?

Since your input has the type datetime-local you can't put inside something that is not of that type.
Note that you also tried to put array inside an input - and you can't do this (what you can do is convert your array to string using JSON.stringify and use that value).
I added another hidden input and used it to save the data of your array.
var datearray = [];
$(document).on('change','#mobile_gig_date',function(){
var date = $("#mobile_gig_date").val();
datearray.push(date);
console.log(datearray.join('; '))
$("#mobile_gig_date_temp").val(JSON.stringify(datearray));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input min="2017-09-01T00:00:00" discard_seconds="true" placeholder="Enter the gig date" id="mobile_gig_date" type="datetime-local" name="gig[date]">
<input type="hidden" value="" name="gig[date_temp]" id="mobile_gig_date_temp" />

javascript - get the date value

I have a problem. I use a date picker in my html page which I want to get value of input date using jquery. I used this :
var birthday_date = $("#birthday_date").val();
but it's not working. I checked the inspect code then realise when I used date picker, the input tag (which used for date) becomes to this :
<input id="textbox1"
name="birthday_date"
data-targetselector="#textbox1"
class="form-control"
data-mddatetimepicker="true"
placeholder="year/month/day"
data-placement="top"
maxlength="10"
data-mdpdatetimepicker=""
data-trigger="click"
data-enabletimepicker="false"
data-mdformat="yyyy/MM/dd"
data-mdpdatetimepickerselecteddatetime="
{"Year":2011,"Month":8,"Day":2,"Hour":9,"Minute":13,"Second":14}"
data-original-title=""
title=""
data-mdpdatetimepickershowing="true"
aria-describedby="popover30621"
type="text">
the value of the date is this part:
mdpdatetimepickerselecteddatetime="{"Year":2011,"Month":8,"Day":2,"Hour":9,"Minute":13,"Second":14}"
the time is not matter, I just wanna date , google gave me nothing and I have no idea how can I get the value like this, any help? or something to help me?

If you are using datepicker, you can access the value like this:
var date = $('#textbox1').datepicker('getDate');

Get php variable containing date from jquery datepicker

I have a jquery datepicker defined like this :
HTML/php:
<input id="datepicker" name="date" placeholder="Date" />
Javascript:
<script>
$(document).ready(function() {
$("#datepicker").datepicker();
});
</script>
This works perfectly but i need to get the date in a php variable. I tried $_POST["date"] but this does not work. Could you help me ? Thanks !

The problem is solved, I don't really know where the problem came from. I still use $_POST["date"] to get the date, then I convert it from dd/mm/yyyy to yyyy-mm-dd (because my sql request requires this format) and it works..
Anyway, thanks everyone !

how to show value of textbox type=date asp.net

I have a textbox with the property type="date". I am able to retrieve the value in backcode but when I try to assign a value, the placeholder "mm/dd/yyyy" is shown.
When I view the markup, the expected value is there - "value='01/01/1991'". I think it has to do with JavaScript overriding the value.
Any suggestion on how I can work around this?
Edit: Sorry, forgot to include the markup and code
So my markup is
<asp:TextBox ID="txtBirthdate" runat="server" class="form-control input-sm" type="date" onkeypress="handleEnter(event)" />
and c# is
txtBirthdate.Text = usr.BirthDate.ToString("MM/dd/yyyy");
the resulting markup is
<input name="ctl00$ctl00$ctl00$ctl00$Body$Body$Body$Body$txtBirthdate" value="01/20/1991" id="ctl00_ctl00_ctl00_ctl00_Body_Body_Body_Body_txtBirthdate" class="form-control input-sm" type="date" onkeypress="handleEnter(event)">
So as you can see, the value was assigned.

I believe this only happens in Chrome. It requires value assignment to be in "yyyy-MM-dd" format. Try in your C#
txtBirthdate.Text = usr.BirthDate.ToString("yyyy-MM-dd");
This should display the correct value (and it doesn't affect the format of the display).
If will display in this format in other browsers tho. You may want to do some browser detection, e.g.
if (Request.Browser.Browser == "Chrome")
{
txtBirthdate.Text = usr.BirthDate.ToString("yyyy-MM-dd");
} else {
txtBirthdate.Text = usr.BirthDate.ToString("MM/dd/yyyy");
}
but perhaps something more sophisticated

For me this worked:
txtBirthdate.Text = Convert.ToDateTime(TablaHabitacion.Rows[fila].Cells[6].Text).ToString("yyyy-MM-dd");

jQuery/JavaScript Date form validation

I am using the jQuery date picker calendar in a form. Once submitted the form passes params along via the url to a third party site. Everything works fine, except for one thing.
If the value inserted into the date field by the datepicker calendar is subsequently deleted, or if the default date, that is in the form on page load, is deleted and the form is submitted I get the following error:
"Conversion from string "" to type 'Date' is not valid."
The solution to my problem is really simple, I want to validate the text field where the date is submitted and send out a default date (current date) if the field is empty for any reason. The problem is I am terrible at Javascript and cannot figure out how to do this.
Here is the form code for my date field.
[var('default_date' = date)]
<input type="text" id="datepicker" name="txtdate" value="[$default_date]" onfocus="if (this.value == '[$default_date]') this.value = '';" onchange="form.BeginDate.value = this.value; form.EndDate.value = this.value;" />
<input type="hidden" name="BeginDate" value="[$default_date]"/>
<input type="hidden" name="EndDate" value="[$default_date]"/>

This is really old and probably solved, but what the heck.
Simplest way to do this is to add a little more javascript to the input's onchange event.
onchange="if( this.value.length > 0 ) { form.BeginDate.value = form.EndDate.value = this.value; } else { form.BeginDate.value = form.EndDate.value = '[$default_date]'; } " />
of course their are still all sorts of other problems associated with date validation, but this is a straightforward way to check for a blank value and return a default based on your current code structure.