render Django HTML tag using JavaScript - javascript

I have installed in my project django-contib-comments and I have an HTML that displays the list of comments and also displays the form to enter a new one.
I now want to use Ajax to submit the form without a page refresh and on success to add the submitted comment to the list.
I have done most of the work, but I'm sure there must be an easier way to achieve this.
my question is if there is a way for me to render a Django HTML tag within a javascript something like this:
document.getElementById("comments").innerHTML = {% render_comment_list for obj %}
so far this is the code I have done:
1) I don't want to change anything in the django-contrib-comments project (i am avoiding to override methods.
2) I used the standard tags in django-contrib-comments to render a list of comments.
{% render_comment_list for obj %}
3) Created a JavaScript that handles the submit of the form and then creates a new entry in the list.
function submit_comments(event) {
event.stopPropagation();
$.ajax({
type: $('#comment_form').attr('method'),
url: $('#comment_form').attr('action'),
data: $('#comment_form').serialize(),
cache: false,
dataType: "html",
success: function (html, textStatus) {
var comment_count_btn = document.getElementById('comment-text-vertical-btn');
if (comment_count_btn != null) {
if (!isNaN(parseInt(comment_count_btn.innerHTML))) {
comment_count_btn.innerHTML = parseInt(comment_count_btn.innerHTML) + 1 + " Comments";
}
}
var comment_count_head = document.getElementById('kapua-comments-header');
if (comment_count_head != null) {
if (!isNaN(parseInt(comment_count_head.innerHTML))) {
comment_count_head.innerHTML = parseInt(comment_count_head.innerHTML) + 1 + " Comments:";
}
}
if (document.getElementById("comments") != null){
submitted_timestamp = getQueryParameter("timestamp", this.data);
submitted_date = new Date();
if (submitted_timestamp == null) {
submitted_date = new Date(submitted_timestamp);
}
submitted_comment = getQueryParameter("comment", this.data);
if (submitted_comment == null) {
submitted_comment = "No value entered"
}
html_comment = "<div class=\"right-aligned\"><div class=\"comment-date\">" + submitted_date + " - " + "</div>" + submitted_comment + "</div><br><br>";
current_html = document.getElementById("comments").innerHTML;
document.getElementById("comments").innerHTML = html_comment + current_html;
}
if (document.getElementById("comment_form") != null){
document.getElementById("comment_form").reset();
}
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
$('#comment_form').replaceWith('Your comment was unable to be posted at this time. We apologise for the inconvenience.');
}
});
return false;
};
Thanks in Advance

Yes there is way in django, You can use [escape][1] to render HTML tag. Here is an simple example -
from django.utils.html import escape
def example(request):
return "%s<div><i>%s</i></div>" % (escape(text), escape(other_text)
For more explanation you can refer to documentation.
https://docs.djangoproject.com/en/2.1/ref/utils/#django.utils.html.escape
Still have any doubts comment it out.

Related

How can I conditionally allow or prevent submission execution?

The situation
I have a page in which I have multiple forms keeping track of the attendance and one progress_update.
On submit of the progress_update form I have got it so that ajax sends the attendance form submissions separately having used the preventdefault() method to stop the original submission, however I would like to on the condition that no errors were returned by the ajax methods allow the original submission that was originally prevented.
What I have so far:
The ajax function:
function send_attendance(name, lesson, form_id, i) {
var url = '/attendance/' + name + '/' + lesson
$('#error-' + i).hide('slow')
$('#error-' + i).html('')
$.ajax({
type: "POST",
url: url,
data: {
attended: $('#attended' + i).val(),
score: $('#score' + i).val(),
writing: $('#writing' + i).val(),
speaking: $('#speaking' + i).val()},
success: function(data) {
if (data.data.message == undefined) {
allow=false;
if (data.data.score[1] == undefined) {
var error_data = data.data.score[0]
} else {
var error_data = data.data.score[1]
}
$('#error-' + i).show('slow')
$('#error-' + i).html('<p style="color:red;">' + error_data + '</p>')
} else {
console.log(data.data.message) // display the returned data in the console.
}
}
});
}
The Intention:
The intention behind this ajax is to send the forms to a separate route for validation and then on success "receiving data.data.message == 'submitted'" pass to the next form in the loop, while on error set the allow variable to false and display the message in hopes to prevent the final form being submitted at the same time.
The call:
$('#update_form').submit(function (e) {
var allow = true;
for (var i = 0; i < studentcount ; i++) {
send_attendance(name=st[i], lesson=lesson, form_id='attendance-' + i, i=i)
}
if (allow == true){
} else {
e.preventDefault();
}
});
The Problem
In doing what I have done I have ended up with a situation of it either submits the ajax submitted forms and that is that preventing the submit form or it submits the form whether errors occured in the ajax that need to be displayed, now how do I get this to work in the way expected? I have tried the methods involved in these previous questions:
How to reenable event.preventDefault?
How to unbind a listener that is calling event.preventDefault() (using jQuery)?
which revolve around using bind and unbind but this doesn't seem to work as needed and results in a similar error.
Any advice would be greatly appreciated.
Edit:
I have adjusted the code based on the comment below to reflect, however it still seems to be evaluating the allow before the ajax have completed. either that or the ajax function isn't changing the allow variable which is set in the submit() call how could i get this to change the allow and evaluate it after the ajax calls are complete?
The Ajax call
function send_attendance(name, lesson, form_id, i) {
var url = '/attendance/' + name + '/' + lesson
$('#error-' + i).hide('slow')
$('#error-' + i).html('')
var form = $('#' + form_id)
$.ajax({
type: "POST",
url: url,
data: $('#'+ form_id).serialize(),
context: form,
success: function(data) {
console.log('done')
if (data.data.message == undefined) {
allow = false;
if (data.data.score[1] == undefined) {
var error_data = data.data.score[0]
} else {
var error_data = data.data.score[1]
}
$('#error-' + i).show('slow')
$('#error-' + i).html('<p style="color:red;">' + error_data + '</p>')
} else {
console.log(data.data.message) // display the returned data in the console.
}
}
});
The function is being called here:
$('#update_form').submit(function (e) {
e.preventDefault();
var allow = true;
var deferreds = [];
for (var i = 0; i < studentcount ; i++) {
deferreds.push(
send_attendance(st[i], lesson, 'attendance-' + i, i));
}
$.when(...deferreds).then(function() {
if (allow == true){
console.log('True')
} else {
console.log('False')
}
});
I also tried:
$('#update_form').submit(function (e) {
e.preventDefault();
var allow = true;
var deferreds = [];
for (var i = 0; i < studentcount ; i++) {
deferreds.push(
send_attendance(st[i], lesson, 'attendance-' + i, i));
}
$.when.apply(deferreds).done(function() {
if (allow == true){
console.log('True')
} else {
console.log('False')
}
});

File browsing and omdb

I'm kinda new to php + javascript.
I have set up "cute file browser" to look at a shared folder on my computer.
it works fine displays all files & folders no problem.
Now im trying to use OMDB to search for movie posters and then display them for each movie name.
Currently it works but only with the first movie title. when inspecting the element in FF it does show all the other posters but only within the first
This is the code i made for the OMDB...
var filmName;
var realName;
filmName = finfo;
realName = filmName.split('.')[0];
var omdbUrl = "http://www.omdbapi.com/?t=" + realName;
$.ajax({
url: omdbUrl,
//force to handle it as text
dataType: "text",
success: function(data) {
//data downloaded so we call parseJSON function
//and pass downloaded data
var json = $.parseJSON(data);
//now json variable contains data in json format
//let's display a few items
document.getElementById("folders").innerHTML += "<img id='imgposter' class='imgPoster' src='" + json.Poster + "'></img>";
}
});
And this is the code for displaying my movie folders:
if(scannedFolders.length) {
scannedFolders.forEach(function(f) {
var itemsLength = f.items.length,
name = escapeHTML(f.name);
if(itemsLength) {
icon = '<span class="icon folder full"></span>';
}
if(itemsLength == 1) {
itemsLength += ' item';
}
else if(itemsLength > 1) {
itemsLength += ' items';
getPoster(name);
}
else {
itemsLength = 'Empty';
}
var folder = $('<li id="folders" class="folders"><span class="name">' + name + '</span> </li>');
folder.appendTo(fileList);
});
}
This is the error i get
As i said i am new here. if anyone could give me any tips would be great thanks

problems displaying page, deleting contents and repopulating - could this be multiple binding?

I have a mobile app.
It consists of 2 screens. The first is for capturing user
credentials and the 2nd is for displaying data.
The idea is to collect the credentials on screen 1.
Then make an ajax call with the credentials to get data and present it on
screen 2 as a series of links.
Then allow the user to touch a link on screen 2. This will return the link data to the javascript and pass it to the ajax call and get more data - THEN delete all the data on screen 2 and repopulate it with the new data.
First thing I want to find out: is showing a page with mobile.changePage(), populating it, deleting the contents and then repopulating it (without another call to mobile.changePage()) a reasonable thing to do?
I'm having a problem and I think its related to how I'm using onclick in the <a>
Each time I display the most recently received data, I want to display it in an <a>. I write each onclick to call the getData routine passing it information to determine the next ajax AND whatever is being displayed in the <a>. The only way I could figure out to access that was in onclick.
Is there a better way?
I'm able to display the results of the first ajax call just fine. But things get weird with the 2nd, 3rd etc.
Sometimes I'll touch a link and I'll progress thru the screens as I expect.
Sometimes I'll touch an <a> on the 1st result screen, the 2nd result screen will display and then (without me selecting data from the 2nd screen) the 3rd screen will display.
I've looked at the logs and the getData() routine is being executed.
What could be causing this? Am I somehow not destroying all the <a> properly? Am I using onclick in a fashion its not designed for? Should I be using buttons styled to look like links instead of <a>
Here's my code:
"use strict";
var app = {
onDeviceReady: function() {
$('#startButton').click(function(){
app.getDeptsForUser();
});
},
getDeptsForUser: function(){
var parms = new Object();
parms.userName = assignedUser;
app.getData(JSON.stringify(parms),"ENDPOINT1", "Departments");
$.mobile.changePage("#index", { transition: 'slide' });
},
getData: function(paramStr, endpoint, displayHeader){
var paramStrObj = JSON.parse(paramStr);
var serverName = server + ":" + port;
var encoded = Base64().encode(paramStrObj.userName + ':' + pass);
var authType = 'Basic ' + encoded;
var option = endpoint+"?action=start&params=" + paramStr;
var URL = serverName + "/rest/bpm/wle/v1/service/"+option;
$.ajax({
url: URL,
type: "POST",
crossDomain: true,
jsonp: "callback",
beforeSend: function (xhr) {
xhr.setRequestHeader("Authorization", authType);
},
success: function (result) {
console.log("MobileMockUp getData() ajax success result="+JSON.stringify(result));
if (endpoint === "ENDPOINT1"){
app.displayData(paramStr, endpoint,"Departments", result.data.data.depts.items);
}
else if (endpoint === "ENDPOINT2"){
app.displayData(paramStr, endpoint,displayHeader, result.data.data.checklists.items);
}
else if (endpoint === "ENDPOINT3"){
app.displayData(paramStr, endpoint,displayHeader, result.data.data.checks.items);
}
},
error: function(jqXHR, textStatus, errorThrown) {
alert('Unable to retrieve '+displayHeader);
},
});
},
displayData: function(currParms,currEndPt, headerText, list){
var nextEndpt;
var nextHeaderText;
var currParmsObj = JSON.parse(currParms);
if (currEndPt === "MD#getDeptsForUser"){
nextEndpt = "MD#getCheckLists";
nextHeaderText = "Check Lists";
}
else if (currEndPt === "MD#getCheckLists"){
nextEndpt = "MD#getChecks";
}
var htmlListString="";
var parmObj;
var newLink;
$('#headerText').text(headerText);
for (var i = 0; i < list.length; i++){
parmObj = new Object();
if (currEndPt === "ENDPOINT1"){
parmObj.userName=currParmsObj.userName;
parmObj.dept=list[i];
}
else if (currEndPt === "ENDPOINT2"){
parmObj.userName=currParmsObj.userName;
parmObj.dept=currParmsObj.dept;
parmObj.checklist=list[i];
}
else if (currEndPt === "ENDPOINT3"){
nextHeaderText = list[i];
}
var str = JSON.stringify(parmObj);
str = str.toString().replace(/"/g, '\\"');
newLink = "<a style='background:#ffffff;padding-top:5%;border-top: thin solid black; display:block;font-size:12px;font-weight:normal;color:#000000;text-decoration: none;' href='#' onclick='app.getData(\""+str+"\",\""+nextEndpt+"\",\""+nextHeaderText+"\")'><pre>" + list[i] + " </pre></a><br>";
htmlListString=htmlListString+newLink;
}
$('#taskListUL').empty();
$('#taskListUL').append(htmlListString);
}
};
Could this be multiple binding?
i figured out it was multiple bindings

Append image in function jquery

Good evening.
I have this jquery code which allows me, once you press the Enter key, to post a comment.
Fattio that I run an append with the username and the content that the user wants to publish.
In addition to the username I would also like to "hang" the profile picture using their path. How do I post a photo?
Thanks for your help. Here's the code:
function commento_post(id_post)
{
$('.form-commento'+id_post).click(function ()
{
$('#ins_commento'+id_post).keydown(function (e)
{
var message = $("#commento"+id_post).val();
var username = $("#username").val();
var id_user = $("#id_user").val();
if(e.keyCode === 13)
{
$.ajax(
{
type: 'POST',
url: 'http://localhost/laravel/public/index.php/post/ins_commento',
data: { commento: message, id_post: id_post },
success: function(data)
{
$('#commento'+id_post).val('');
$('#commentscontainer'+id_post).append
(
/*$(".username-commento"+id_post).html
(*/
$('<a/>',
{
text : username, href : 'http://localhost/laravel/public/index.php/utente/'+id_user
}).css({'font-weight':'bold'})
//)
).append(' ').append(message).append($('<br/>'));
var el = $('#numero_commenti'+id_post);
var num = parseInt(el.text());
el.text(num + 1);
}
});
}
});
});
}
In your success function, you could simplify everything quite a bit in the following way while not using jQuery append so much, but just using a variable to store your code and then appending it in one go. This will allow you to append all sort of elements, it's easily parseable for the you and it reduces the amount of calls you have to make.
// Add whatever you want your final HTML to look like to this variable
var html = "<a href='http://localhost/laravel/public/index.php/utente/" + id_user + "' style='font-weight: bold;'>" + username + "</a>";
html += message;
// add an image
html += "<img src='path/to/image.jpg' />"
html += "<br />";
// append to code you constructed above in one go
$('#commentscontainer' + id_post).append(html);
Update
I amended an incorrect quote and changed + id_user + "to + id_user + "', which makes everything after it work.

Is there any size limitation for ajax post?

I'm posting ckeditor content via Ajax to php. But getting 4-5 sentence of posted material in my db table. I wonder, Is there any size limitation for ajax post? is there any way to post big text contents via ajax?
My js looks like that
function postViaAjax(autosaveMode) {
var name = $("#name").val();
var title = $("#title").val();
var menu = $("#menu").val();
var parentcheck = $(".parentcheck:checked").val();
var id = $("#id").val();
if (parentcheck == 0) {
var parent = parentcheck;
} else {
var parent = $("#parent").val();
}
var content = CKEDITOR.instances['content'].getData();
var dataString = 'name=' + name + '&title=' + title + '&menu=' + menu + '&parentcheck=' + parentcheck + '&id=' + id + '&parent=' + parent + '&content=' + content;
$.ajax({
type: "POST",
url: "processor/dbadd.php",
data: dataString,
dataType: "json",
success: function (result, status, xResponse) {
var message = result.msg;
var err = result.err;
var now = new Date();
if (message != null) {
if (autosaveMode) {
$('#submit_btn').attr({
'value': 'Yadda saxlanıldı ' + now.getHours() + ':' + now.getMinutes() + ':' + now.getSeconds()
});
} else {
$.notifyBar({
cls: "success",
html: message + ' ' + now.getHours() + ':' + now.getMinutes() + ':' + now.getSeconds()
});
}
}
if (err != null) {
$.notifyBar({
cls: "error",
html: err
});
}
}
});
};
The HTTP specification doesn't impose a specific size limit for posts. They will usually be limited by either the web server or the programming technology used to process the form submission.
What kind of server do you use?
There isn't any size limitation for POSTs in HTTP.
Maybe you have an & in your content variable. Then everything after that would be stripped after that.
Other than that what type do you use for your data column in the database? Is it, by any chance, something like varchar(1000)? Then anything bigger would also get stripped.
Check what you actually receive on the server end, so you know if you've got a problem with the code or the database.
You have a limitation on the Apache server. Look for LimitRequestBody directive.
This may be helpful:
http://gallery.menalto.com/node/14870
In theory the limits on AJAX requests are the same on all the other requests, so it depends on your web server/app setup. See also Max length of send() data param on XMLHttpRequest Post

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