Catherine Catherine - 4 months ago 54
Javascript Question

Using jQuery datepicker with multiple django forms in one page

So I have a create announcement form and then an edit form for each announcement and each form has its own datepicker. My function for controlling the datepicker is:

$(function() {
$( ".datepicker" ).datepicker({
changeMonth: true,
changeYear: true,
});
});


Initially my issue was that using the datepicker in one of the edit forms would change the field in the create form since the ids were the same. I got around this by adding ids (in my
forms.py
) like so:

end_date = forms.DateField(label='Expires', widget=forms.TextInput(attrs={'class':'datepicker form-control', 'id':'end_date_create'}))


and

end_date = forms.DateField(label='Expires', widget=forms.TextInput(attrs={'class':'datepicker form-control', 'id':'end_date_edit'}))


to my createAnnouncement and EditAnnouncement forms. But since I have multiple edit forms per page, I still have the same issue where using the datepicker on any edit form changes the field of only the top edit form. I am using django widget tweaks to render my forms so it automatically generates HTML and ids and classes and everything. Each edit form is in a div with a unique id, but the form fields themselves are named the same thing across all the forms. Does anyone know how I could generate unique ids for my form fields with django widget tweaks? Or maybe there is some javascript or something I could add to my datepicker function that tells the datepicker to change the value of the field that is in the same div?

EDIT: My template looks like this:

{% if boardAnnouncements %}
<h3>Announcements</h3>
<div class="container" style="margin: 0px; padding: 0px;">
<ul>
{% for announcement in boardAnnouncements %}
<div class="row" style="padding-bottom: 10px;">
<li>
<div class="col-md-6">
<!-- display announcement content -->
</div>
<div class="col-md-6">
<!-- edit button calls javascript function to hide/unhide div with edit form in it -->
<a href="javascript:unhide_announcement('editann-{{announcement.id}}', '{{announcement.id}}')" class="btn btn-primary" style="margin-left: 10px;"><i class="fa fa-pencil" aria-hidden="true"></i> Edit</a>
</div>
</div>
<!-- each div gets unique id that corresponds to announcemt id -->
<div id="editann-{{announcement.id}}" class="hidden">
<form role="form" action="/editannouncement/{{announcement.id}}/" method="post">
<!-- display edit form with django widget tweaks -->
{% csrf_token %}
{% for field in editAnnouncement %}
{% if field.errors %}
<div class="form-group has-error">
<label class="col-sm-2 control-label" for="id_{{ field.name }}">
{{ field.label }}</label>
<div class="col-sm-10">
{{ field }}
<span class="help-block">
{% for error in field.errors %}
{{ error }}
{% endfor %}
</span>
</div>
</div>
{% else %}
<div class="form-group">
<label class="col-sm-2 control-label" for="id_{{ field.name }}">{{ field.label }}</label>
<div class="col-sm-10">
{{ field }}
{% if field.help_text %}
<p class="help-block"><small>{{ field.help_text }}</small></p>
{% endif %}
</div>
</div>
{% endif %}
{% endfor %}
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="edit_announcement" class="btn btn-primary">Save</button><br><br>
</div>
</div>
</form>
</li>
</div>
{% endfor %}
</ul>
</div>
{% endif %}
<div>


And the generated HTML for the edit forms is:

<div id="editann-1" class="unhidden">
<form class="ng-pristine ng-valid" role="form" action="/editannouncement/1/" method="post">
<input name="csrfmiddlewaretoken" value="AbTEZYmK1RF9yeom1C34IFFCj3EBrOD3" type="hidden">
<div class="form-group">
<label class="col-sm-2 control-label" for="id_description">Edit Description</label>
<div class="col-sm-10">
<textarea class="form-control" cols="40" id="id_description" name="description" rows="10"></textarea>
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="id_end_date">Expires</label>
<div class="col-sm-10">
<input class="datepicker form-control hasDatepicker" id="end_date_edit" name="end_date" type="text">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="edit_announcement" class="btn btn-primary">Save</button><br><br>
</div>
</div>
</form>
</div>
<div id="editann-2" class="unhidden">
<form class="ng-pristine ng-valid" role="form" action="/editannouncement/2/" method="post">
<input name="csrfmiddlewaretoken" value="AbTEZYmK1RF9yeom1C34IFFCj3EBrOD3" type="hidden">
<div class="form-group">
<label class="col-sm-2 control-label" for="id_description">Edit Description</label>
<div class="col-sm-10">
<textarea class="form-control" cols="40" id="id_description" name="description" rows="10"></textarea>
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" for="id_end_date">Expires</label>
<div class="col-sm-10">
<input class="datepicker form-control hasDatepicker" id="end_date_edit" name="end_date" type="text">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" name="edit_announcement" class="btn btn-primary">Save</button><br><br>
</div>
</div>
</form>
</div>


So to clarify each editann-# div has an edit form in it (and each edit form has a datepicker). Right now since the all the edit form "Expire" fields have id
id_end_date
the datepicker changes the value of the first edit form, no matter which datepicker I am using.

Answer

I came up with a solution involving some javascript and jQuery.

function unhide_announcement(divID, ID) {
var item = document.getElementById(divID);
if (item) {
    /* hide/unhide div */
    item.className=(item.className=='hidden')?'unhidden':'hidden';
    /* give each end_date field a unique ID */
    var newID = 'id_end_date' + ID;
    item.querySelector('#id_end_date').id = newID;
    /* datepicker functionality */
    $(function() {                                                    
        $( '#'+newID ).datepicker({
          changeMonth: true,
          changeYear: true,
        });
      })
    }
}

Since each edit announcement form is in a unique div, I get that div first and then within the div there is only 1 edit announcement form so I change that id from id_end_date to id_end_date1 or whichever announcement id it is associated with. And then I changed the jQuery datepicker function I had to select by id instead of by class and it worked. So when I call it in my template it looks like this:

<a href="javascript:unhide_announcement('editann-{{announcement.id}}', '{{announcement.id}}')" class="btn btn-primary">Edit</a>
<div id="editann-{{announcement.id}}" class="hidden">
    <!-- edit announcement form -->
    <form>
        ...
    </form>
</div>