Problems using Ajax with Django - javascript

I am having problems trying to update a block of my site (which includes another templates) by issuing an Ajax call. The that needs to be updated works just fine, but the JS script that is inside that template does not work (before, I was just adding the full request to my template, but that caused to have twice the content of the parsed template, but JS scripts were working).
PD: I am kind new to JS and have some experience with Django (still just digging in the world of Web Apps development).
My template:
{% load staticfiles %}
<script>
$(document).ready(function() {
var current_item_id = null;
var current_item_title = null;
var selected_items = null;
// Selección en las tablas
$('.table tr').on('click', function() {
$(this).toggleClass('selected');
});
// Comportamiento del toolbar flotante
$('.table tr').on('click', function() {
selected_items = $('.selected');
current_item_id = $(this).attr('id');
current_item_title = $(this).attr('name');
if (selected_items.length === 0) {
$('.modify-big').attr('disabled', true);
$('.delete-big').attr('disabled', true);
}
else if (selected_items.length > 1) {
$('.modify-big').attr('disabled', true);
}
else {
$('.modify-big').attr('disabled', false);
$('.delete-big').attr('disabled', false);
}
});
});
</script>
<div id='notifications'>
{% if notifications %}
<table class="table">
<thead>
<tr>
<!--<th class="text-left table-id">ID del Item</th>-->
<th class="text-left">Item</th>
<th class="text-left">Link de descarga</th>
<th class="text-left">Plantilla</th>
</tr>
</thead>
<tbody class="table-hover">
{% for notification in notifications %}
<tr id='{{ notification.item_id }}' name='{{ notification.item_title }}'>
<!--<td class='text-left'>{{ notification.item_id }}</td>-->
<td class='text-left'>
<a class='tooltip-right' href='#' tooltip='Ver item'>
<img src="{% static 'images/icon_notification_details.png' %}">
</a>
{{ notification.item_title }}
</td>
<td class='text-left'>
{% if notification.download_link %}
<a href='{{ notification.download_link }}' target='_blank'>{{ notification.download_link }}</a>
{% else %}
---
{% endif %}
</td>
<td class='text-left'>{{ notification.email_template.name }}</td>
</tr>
{% endfor %}
</tbody>
</table>
{% if first_time %}
<p class='info-msg first-time'>Últimas notificaciones agregadas.</p>
{% else %}
<div class="pagination">
<span class='step-links'>
{% if notifications.has_previous %}
<button class='previous' onclick='search_notifications("", "{{ notifications.previous_page_number }}");'></button>
{% else %}
<button class='previous' disabled></button>
{% endif %}
<span class='current'>
Página {{ notifications.number }} de {{ notifications.paginator.num_pages }}
</span>
{% if notifications.has_next %}
<button class='next' onclick='search_notifications("", "{{ notifications.next_page_number }}");'></button>
{% else %}
<button class='next' disabled></button>
{% endif %}
</span>
</div>
{% endif %}
{% else %}
<p class="info-msg info">No se han encontrado notificaciones.</p>
{% endif %}
</div>
Ajax Call:
search_notifications = function(first_time=false, page=null) {
show_div_loader($('#notifications'));
$.ajax({
url: "{% url 'notifications_loader' %}",
data: {
'search_notifications_query': $('#search-notifications-query').val(),
'search_notifications_listing': $('#search-notifications-listing option:selected').val(),
'first_time': first_time,
'page': page,
},
success: function(data){
// Solo necesitamos actualizar la sección #notifications
data = $(data).filter('#notifications').html();
notifications.html(data);
hide_div_loader($('#notifications-container'));
}
});
};
My view:
def notifications_loader(request):
[...]
return render(request, 'notifications_search_result.html', {'notifications': notifications, 'first_time': first_time})
As you can see in the Ajax sucess function, I do:
data = $(data).filter('#notifications').html();
notifications.html(data);
Before, I was doing:
notifications.html(data);
This last one was adding twice the parsed template but JS script inside it were working.
What I am doing wrong?
Thanks in advance.
EDIT:
I don't know if is the best way, but I've added a 'container' to my code and just insert parsed themplate there:
In my main template:
<div id='notifications-container'>
<!--{% include 'notifications_search_result.html' %}-->
</div>
JS scripts are working again and I don't have twice the parsed template. Now, for I was reading I think this is not the best way to work with Django and Ajax or I am wrong? Maybe I just need to return the view as JSON and replace only the needed data?
Still I have doubs about Ajax+Django and best practices way.
Thanks.

When doing AJAX using Django I do it this way:
Define a route(view) that will serve your default template containing your ajax call script.
Add another route(view) for the ajax call:
def auto_complete(request):
# do some actions and put the results in var
return HttpResponse(simplejson.dumps(var),content_type='application/json')
And you will call the second route in your ajax call
Hope it helps you

Related

django cart.js loop is not running

cart.js
this is not working
nothing is printed in the console or some declaration is wrong
answer quickly
var updateBtns = document.getElementsByClassName('update-cart')
for(var i=0 ; i<updateBtns.length ; i++)
{
updateBtns[i].addEventListener('click',function(){
var productId = this.dataset.product
var action = this.dataset.action
console.log(productId,action)
})
}
is there any mistake in html code
{% for product in products %}
{% if product.category == "Dosa" %}
<div class="product">
<tr>
<td><h5>{{ product.name }}</h5></td>
<td><h5>{{ product.price }}</h5></td>
<td><button data-product={{product.id}} data-action="add" class="btn btn-warning btn-add update-cart">Add to cart</button></td>
</tr>
</div>
{% endif %}
{% endfor %}
Seems to be working perfectly. I would suggest to please check once in incognito/Private mode. Might be a problem of cache...

list all image button clicked change image

every one ,I am using django's template language with javascript to do "clicked image button change image" ,however,the result I got was only can change the last button.I do not know why what's wrong about the code , here is my
indext.html
{% extends 'base.html' %}
{% load static %}
{% block title %}
Homepage - {{ block.super }}
{% endblock title %}
{% block content %}
<script>
function setColor(e, btn, color) {
var target = e.target,
count = +target.dataset.count;
target.style.backgroundColor = count === 1 ? "#7FFF00" : '#FFFFFF';
target.dataset.count = count === 1 ? 0 : 1;
}
var img_array = [ src="{% static "img/published.png" %}" , src="{% static "img/draft.png" %}"];
i = 0;
{% for post in posts %}
function myFunction({{ post.model_number }}) {
i++;
document.getElementById("{{ post.model_number }}").src = img_array[i];
if (i == img_array.length - 1) {
i = -1;
}
}
{% endfor %}
</script>
<table class="table table-bordered">
<tr>
<td>產品編號</td><td>產品名稱</td><td>建立日期</td><td>產品圖片</td><td>最後修改日期</td><td>產品說明</td><td>建立者</td><td>修改者</td><td></td>
</tr>
{% for post in posts %}
<tr>
<td> {{ post.model_number }} </td>
<td>{{ post.name }}</td>
<td>{{ post.created }} </td>
<td> <img src="{% if post.image %} {{ post.image.url }}{% else %}{% static "img/no_image.png" %}{% endif %}" height="100" width="100"> </td>
<td>{{ post.modified }} </td>
<td>{{ post.feature }}</td>
<td>{{ post.user }}</td>
<td>{{ post.useredit }}</td>
{% for cp in post.cataloggroup.all %}
<td> {{cp }}</td>
{% endfor %}
<td><a href="{% url 'edit_thing' slug=post.slug %}"><input class="button0 button2" type="button" id="button" value="編輯" style="color:#fffff0" onclick="setColor(event, 'button', '#101010')"; data-count="1" /><a></td>
<td><button onclick="myFunction({{ post.model_number }})"><img id="{{ post.model_number }}" src="{% static "img/published.png" %}" width="50" height="30"></button></td>
</tr>
{% endfor %}
</table>
{% include "pagination.html" with page=posts %}
{% endblock content %}
and it will render the web
however, when I click the top button ,it will change the bottom button,I have to let every button clicked can change image
above image I clicked top button but changed the bottom button's image "published ---> draft"
I have to let every button clicked can changed it's own image,how can I do it?
It is due to the fact you have your myFunction() definintion inside a <script> tag that is entered into the HTML every iteration of your for loop in django.
This means the function is constantly being redefined and therefore myfunction functionality will always be that of the last iteration.
If you define myFunction() outside of your django loop and pass in the model number to the function (as below) then it should work as expected`
function myFunction(model_number) {
i++;
document.getElementById(model_number).src = img_array[i];
if (i == img_array.length - 1) {
i = -1;
}
}
ok,I solve the problem
index.html
<script>
...........
var img_array = [ src="{% static "img/published.png" %}" , src="{% static "img/draft.png" %}"];
i = 0;
{% for post in posts %}
function a{{ post.model_number }}() {
i++;
document.getElementById("{{ post.model_number }}").src = img_array[i];
if (i == img_array.length - 1) {
i = -1;
}
}
{% endfor %}
</script>
<table class="table table-bordered">
<tr>
{% for post in posts %}
<tr>
.........
<td><button onclick="a{{ post.model_number }}()"><img id="{{ post.model_number }}" src="{% static "img/published.png" %}" width="50" height="30"></button></td>
</tr>
{% endfor %}
</table>

Flask: don't redirect to a url()

I am working on a web app which is built on flask,postgreSQL. It is used to collect lab data and manage the data collected. There are two pages in this app, which I have attached are used to show lab data of some labs chosen by the user by querying from a database.
One page(admin_select_lab_for_data.html) enables the user to select some existing labs and redirects the user to the other page(admin_edit_data.html), which shows all the data in the selected labs. When I select the labs and click the button go to lab, the browser fails to redirect to (admin_edit_data).
The outputs printed by python are all correct(which proves that in flask, the redirection happens,lab_ids are passed correctly and all the related data are queried correctly). The http request returns 200 ok. However, the browser just stay on the same page and ajax POST request alerts the error(which is inconsistent with the fact that the data have already been received by admin_select_lab_for_data).
main.py
# review/edit Data
#app.route('/admin_select_lab_for_data',methods=['GET','POST'])
def admin_select_lab_for_data():
if request.method=='POST':
lab_ids = []
jsonData = request.get_json()
lab_ids = jsonData['lab_ids']
return redirect(url_for('admin_edit_data',lab_ids={'lab_ids':lab_ids}))
lab_list = []
db_session = db.get_session()
for lab in db_session.query(schema.Lab_info).all():
data_num = 0
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab.lab_id)
for r in query_rows:
data_num += db_session.query(schema.Lab_data).filter(schema.Lab_data.row_id==r.row_id).count()
lab_list.append({'lab_id':lab.lab_id,'lab_name':lab.lab_name,'class_name':lab.class_name,'prof_name':lab.prof_name,'data_num':data_num})
return render_template('admin_select_lab_for_data.html',lab_list=lab_list)
# review/edit Data
#app.route('/admin_edit_data')
def admin_edit_data():
# Get a list of lab_ids that are needed to be retrieved
lab_ids = ast.literal_eval(request.args['lab_ids'])['lab_ids']
# lab_ids = ['test1_101_C','test2_101_N']
lab_data = []
lab_data_by_student = []
row_names_list = []
err_msg = ''
db_session = db.get_session()
#Group row data according to row_name
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab_ids[0]).order_by(schema.Lab_rows.row_order)
for r in query_rows:
lab_data.append({'row_name':r.row_name,'row_data_list':[]})
row_names_list.append(r.row_name)
for lab_id in lab_ids:
query_rows = db_session.query(schema.Lab_rows).filter(schema.Lab_rows.lab_id==lab_id).order_by(schema.Lab_rows.row_order)
index = 0
#Check whether these labs are compatitble with each other(the number of rows and the names of rows must be the same)
if query_rows.count()!=len(row_names_list):
err_msg = lab_ids[0]+' and '+lab_id+' are incompatible: the number of rows is different-'+str(query_rows.count())+' and '+str(len(row_names_list))
else:
for r in query_rows:
if (row_names_list[index]!=r.row_name):
err_msg = lab_ids[0]+' and '+lab_id+' are incompatible:'+row_names_list[index]+' and '+r.row_name+' are different row names'
break
else:
query_datas = db_session.query(schema.Lab_data).filter(schema.Lab_data.row_id==r.row_id).order_by(schema.Lab_data.data_id)
for data in query_datas:
lab_data[index]['row_data_list'].append({'lab_id':lab_id,'student_name':data.student_name,'data_id':data.data_id,'row_data':data.row_data})
index+=1
if err_msg!='':
return render_template('admin_edit_data.html',lab_data=lab_data,student_data=lab_data_by_student,lab_ids=lab_ids,err_msg=err_msg)
#Group row data according to student_name
for row in lab_data:
#sort row_data_list to make all the data across different lists
sorted(row['row_data_list'],key=lambda element:element['data_id'])
# if list is empty, add student names into it
if not lab_data_by_student:
for data in row['row_data_list']:
lab_data_by_student.append({'student_name':data['student_name'],'lab_id':data['lab_id'],'row_data_list':[]})
for i in range(len(row['row_data_list'])):
data = row['row_data_list'][i]
lab_data_by_student[i]['row_data_list'].append({'row_name':row['row_name'],'row_data':data['row_data']})
print('\n\n\n')
print(lab_ids)
print('\n\n\n')
print(lab_data)
print(lab_data_by_student)
print(lab_ids)
print(err_msg)
print('\n\n\n')
return render_template('admin_edit_data.html',lab_data=lab_data,student_data=lab_data_by_student,lab_id=lab_id,err_msg=err_msg)
admin_select_lab_for_data.html
{% extends "admin_home.html" %}
{% block head %}
<meta charset="UTF-8">
<title>Select lab for data</title>
<script>
$(document).ready(function(){
$('button[name=go_to_lab]').click(function(){
var lab_ids = [];
var checkboxes = document.getElementsByTagName('input')
for (var i = 0; i < checkboxes.length; i++) {
if (checkboxes[i].type == 'checkbox' && checkboxes[i].checked) {
lab_ids.push($(checkboxes[i]).data('labid'));
}
}
if (lab_ids.length==0){
$('#error_message_no_lab_choose').show().delay(1000).fadeOut();
}
else{
$.ajax({
type: 'POST',
contentType: 'application/json',
dataType: 'json',
url: 'http://127.0.0.1:5000/admin_select_lab_for_data',
data: JSON.stringify({'lab_ids':lab_ids}),
success: function(result){
alert('Submit successfully');
},
error : function(result){
alert('Fail to submit');
console.log(result)
}
});
}
});
});
</script>
{% endblock %}
{% block content %}
{% if (lab_list|length)==0 %}
No lab exists<br>
{% else %}
<table class="table">
<thead>
<tr>
<th class="tg-yw4l">Lab Index</th>
<th class="tg-yw4l">Lab Name</th>
<th class="tg-yw4l">Class Name</th>
<th class="tg-yw4l">Professor Name</th>
<th class="tg-yw4l">Number of data available</th>
<th class="tg-yw4l">Choose</th>
</tr>
</thead>
<tbody>
{% for lab in lab_list %}
<tr>
<th class="tg-yw4l">{{loop.index}}</th>
<td class="tg-yw4l">{{lab.lab_name}}</td>
<td class="tg-yw4l">{{lab.class_name}}</td>
<td class="tg-yw4l">{{lab.prof_name}}</td>
<td class="tg-yw4l">{{lab.data_num}}</td>
<td class="tg-yw4l"><input type="checkbox" data-labid="{{lab.lab_id}}"></td>
</tr>
{% endfor %}
</tbody>
</table>
<br>
<button name="go_to_lab">Go to lab</button>
<div class="temporary_message" id="error_message_no_lab_choose">You need to select one lab</div>
{% endif %}
{% endblock %}
admin_edit_data.html
{% extends "admin_home.html" %}
{% block head %}
<meta charset="UTF-8">
<title>Edit Data</title>
{% endblock %}
{% block content %}
{% if lab_data|length==0 %}
<h1> No data available for this lab </h1>
{% elif err_msg!="" %}
<h1> {{err_msg}} <h1>
{% else %}
<table class="table" id={{lab_id}} name={{lab_data|length}}>
<thead>
<tr>
<th>Index</th>
<th>Student Name</th>
<th>Lab ID</th>
{% for r in lab_data %}
<th>{{r["row_name"]}}</th>
{% endfor %}
</tr>
</thead>
<tbody>
{% for s in student_data %}
<tr>
<th>{{loop.index}}</th>
<td><input value={{s["student_name"]}}></td>
<td>{{s["lab_id"]}}</td>
{% for i in range(lab_data|length) %}
<td><input value={{s["row_data_list"][i]["row_data"]}}></td>
{% endfor %}
<td><button name=save_all>Save All</button></td>
<td><button name=delete>Delete</button></td>
</tr>
{% endfor %}
</tbody>
</table>
<button>Return</button>
{% endif%}
{% endblock %}
You can never achieve a page redirect as a result of an Ajax post request.
You either have to submit a regular form post and do the redirect or you need to return a result from the Ajax call and change the page using window.location in the browser.

XMLHttpRequest / AJAX request sending in a twig for loop

I'm trying to develop a simple task list with PHP. I have a list of tasks using twig http://twig.sensiolabs.org/ for each loop. The checkbox is checked if the task is marked as done. My question is how can I attach to each checkbox a script to make ajax calls with different parameters so the server knows which task is being checked?
<table>
<thead>
<tr>
<th>Task</th>
<th>Valmis</th>
</tr>
</thead>
<tbody>
{% for task in tasks %}
<tr>
<td>{{task.description}}</td>
<td><input type="checkbox" {{ task.done ? "checked" : "" }} ></td>
</tr>
{% endfor %}
</tbody>
</table>
I add a class for enable ajax call to a form, and make it via a POST to the server and manage the response, like this example:
Javascript code:
$(document).ready(function() {
$('.lista-proroghe-item').each(function(){
$(this).find('.perform-ajax-request-button').click(function(){
var form = $(this).closest("form"), action = form.attr('action');
var currentButton = $(this);
var currentMessage = $(this).next('.proroga-messaggio');
$(this).attr('disabled', 'disabled');
$(this).html('Processing...');
$.ajax({
url: action,
type: "POST",
data: form.serialize(),
success: function(data) {
// console.log(data);
$(currentButton).hide();
$(currentMessage).html('<span>'+data.description+'<br>'+data.extendedMessage+'</span>');
}
});
e.preventDefault();
return false;
})
})
});
Twig code:
{% for extension in assignation.contract.contractModificationDurations %}
<li class="lista-proroghe-item">
<form action="{{ path('contractExtension', {'idContractModification' : extension.idContractModification, 'userid':user.id }) }}">
Element
<button class="button small perform-ajax-request-button right"><span class="refresh">to task</span></button>
<div class="proroga-messaggio"></div>
</form>
</li>
{% else %}
<li>
Nessuna proroga trovata
</li>
{% endfor %}
Hope this help.

Django javascript for dynamic html table cells

I'm attempting to access the contents of a cell, within my django template using javascript.
The table can contain x rows. When any of the "click to show" links (in the TEST column) are clicked, I would like the row's {{ i.description }} to be passed through to my views (ajax_test function), the "click to show" link to disappear and be replaced with the returned html from the view. I've included my terrible javascript attempt, knowing full well that this doesn't do what I'm asking. If anyone could help, it would be very much welcomed.
Template:
{% extends "myapp/base.html" %}
{% block content %}
<p>You searched for: <strong>{{ query }}</strong></p>
{% if elements %}
<p>Found {{ elements|length }} Element{{ elements|pluralize }}.</p>
<div class="datagrid"><table>
<thead><tr>
<th>Name</th>
<th>Description</th>
<th>Type</th>
<th>Parameter Arguments</th>
<th>TEST</th>
<tbody>
{% for i in elements %}
<tr class="{% if forloop.counter|divisibleby:2 %}alt{% else %}{% endif %}">
<td>{{ i.name }}</td>
<td><div id="desc">{{ i.description }}</div></td>
<td>{{ i.type }}</td>
<td>{% for a in i.parameter.all %}{{ a.argument }}{% endfor %}</td>
<td><div class="clicks">click to show</div></td>
</tr>
{% endfor %}
</tbody>
</table></div>
{% endblock %}
Javascript (this is where I haven't got a clue really, the code below is a failed attempt). The code is included as a static file (ajax_test.js, which is loaded from base.html)
$(function(){
var myCell = document.getElementById("desc");
var cellContents = (myCell.innerHTML);
$('.clicks').click(function() {
$.ajax({
type: "POST",
url: "/myapp/test_ajax/",
data: {
'ajax_data' : cellContents,
'csrfmiddlewaretoken' : $("input[name=csrfmiddlewaretoken]").val()
},
success: ajaxSuccess,
dataType: 'html'
});
});
});
function ajaxSuccess(data, textStatus, jqXHR)
{
$('.here').html(data); //I would like to put this in the "click to show" cell. I was placing it in a random div for testing.
}
test_ajax view:
def ajax_test(request):
if request.POST:
ajax_data = request.POST['ajax_data']
ajax_query = #some generic lookup using ajax_data
return render_to_response('myapp/ajax_test.html', {'ajax_query': ajax_query})
ajax_test template (to be returned to the cell):
{{ ajax_query }}
Try this:
html
<td><div class="clicks"><a class="click-to-show" href="#" data-desc="{{ i.description }}">click to show</a></div></td>
javascript
$(function(){
$('.click-to-show').click(function(e) {
$.ajax({
type: "POST",
url: "/myapp/test_ajax/",
data: {
'ajax_data' : $(e.target).attr("data-desc"),
'csrfmiddlewaretoken' : $("input[name=csrfmiddlewaretoken]").val()
},
success: function ajaxSuccess(data, textStatus, jqXHR) {
$(e.target).parent().html(data);
},
dataType: 'html'
});
});
});
As you can see we keep the DOM relative to link element all the time, since we render rows multiple times, this will make sure we update the correct row.

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