Develop Reference

Updating table with jQuery, but browser not refreshing page

I've got a node.js and sockets app that I'm using to build a SPA. A user fills out a form to create a new lobby. When they submit it, a socket event it sent to the server, the server adds the lobby, then the server emits an event to everyone with the updated list of lobbies. When this occurs, my client side JS receives the lobby list and updates a table. While viewing the browser console, this seems to work fine. I see that the the lobby info is logged in my update_lobbies function. I see that it loops through the lobbies, and I even see the html update with the new information. However, the browser doesn't seem to update the view. If I refresh the page, which requests the same lobby information, the page will update. Also, at that point, after the refresh, future lobby updates will be visually updated for that user.
socket.on('lobby list', function(data){
if(data.lobbies.length > 0){
update_lobbies(data.lobbies);
}
}
Which then calls update_lobbies():
const update_lobbies = (lobbies) => {
var lobbies_table = document.getElementById('lobbies_table');
lobbies_table.innerHTML = "";
console.dir(lobbies);
$("#lobbies_table").append("<tr>" +
"<th>" + "Name" + "</th>" +
"<th>" + "Participants" + "</th>" +
"<th>" + "Current State " + "</th>" +
"<th>" + "Actions" + "</th>" +
"</tr>");
for (var i = 0; i < lobbies.length; i++){
console.log("looping");
$("#lobbies_table").append("<tr>" +
"<td>" + lobbies[i].name + "</td>" +
"<td>" + lobbies[i].participants.length + "/" + lobbies[i].capacity + "</td>" +
"<td>" + lobbies[i].state + "</td>" +
"<td>" + "<button id=\"join_lobby\" value=\"" + lobbies[i].name + "\">Join</button>" + " | " + "<button id=\"spectate_lobby\" value=\"" + lobbies[i].name + "\">Spectate</button>" + "</td>" +
"</tr>");
}
}
One thing that may be related is that I have a e.preventDefault(); in the form to prevent the page from reloading when I submit the form. Removing this obviously 'fixes' the problem because I'm doing a reload, but I don't want to have to reload the page to get the browser to update the view. I'm not exactly storing state information yet, so reloading isn't yet an option anyway.

I was making a stupid mistake. If the page loaded and there were no lobbies, I was hiding the table. I was just forgetting to show it when lobbies were added.

How to build an anchor link to open page in new window using Kendo Grid Columns?

I have a Kendo Grid with a column definition as follows:
columns.Bound(c => c.Id).Title("ID #").Width("150px").ClientTemplate("#=showDetails(data.Id)#");
I'm calling a method showdetails that returns a link to open the details in a new page.
I need some help figuring out how to build the link.
This is my showDetails method:
function showDetails(data) {
var returnText = "<a href='/Detail/Index/" + data + "'>" + data + "</a>";
return returnText;
}
How do I modify it, so, the details page is opened in a new window?

add:
target="_blank" to return statement
var returnText = "gt a href='/Detail/Index/" + data + "'>" + data + "</a>";
to:
var returnText = "gt a target='_blank' href='/Detail/Index/" + data + "'>" + data + "</a>";
Reference link: https://www.w3schools.com/tags/att_a_target.asp

WinJS forward custom object to print function

I use WinJS in my application and try to print some content. Made my printer class according to this tutorial https://dzone.com/articles/windows-8-print-contract-%E2%80%93.
function registerForPrintContract(participiantData) {
var printManager = Windows.Graphics.Printing.PrintManager.getForCurrentView();
printManager.addEventListener("printtaskrequested", onPrintTaskRequested, false);
}
function onPrintTaskRequested(printEvent) {
var printTask = printEvent.request.createPrintTask("Print Example", function (args) {
printCurrentPage(args);
printTask.oncompleted = onPrintTaskCompleted;
});
}
function printCurrentPage(args) {
var docHtml = document.createDocumentFragment();
docHtml.appendChild(createDocumentContent());
args.setSource(MSApp.getHtmlPrintDocumentSource(docHtml));
}
function createDocumentContent() {
var container = document.createElement("div");
container.innerHTML = "<h2>" + firstname + " " + lastname + "</h2>" +
"<h4>" + emailaddress1 + "<h4>";
return container;
}
function showPrintUI() {
Windows.Graphics.Printing.PrintManager.showPrintUIAsync();
}
My problem is that I do not know how to forward some object data to createDocumentContent() function. In this example I put firstname, lastname and email. Those data I cannot get from html page I need to send them on print button click.
All examples I saw are about printing current page or making new content from data which we can get from HTML page by querying DOM, no example where I can send custom object.
What is the best way to do this ?

My problem is that I do not know how to forward some object data to createDocumentContent() function. In this example I put firstname, lastname and email. Those data I cannot get from html page I need to send them on print button click.
Do you mean you want to put the html output of "<h2>"+firstname + " " +lastname+"</h2>"+"<h4>" + emailaddress1 + "<h4>" to your print page?
The behavior of innerHTML has changed in Windows Store App Development.
see HTML and DOM API changes list innerHTML section:
Content is filtered as through it was processed by the toStaticHTML method
But WinJS offers a method that you can utilize to inject HTML.
Here is the link to documentation of this method: WinJS.Utilities.insertAdjacentHTML
Here is a code snippet that shows a simple use this method:
function createDocumentContent() {
var obj = {
firstname: "winffee",
lastname: "xia",
emailaddress1:"test#126.com"
}
var htmlString = "<h2>" + obj.firstname + " " + obj.lastname + "</h2>" +
"<h4>" + obj.emailaddress1 + "<h4>";
var container = document.createElement("div");
WinJS.Utilities.insertAdjacentHTML(container, "beforeend", htmlString);
return container;
}

Outputting data from an AJAX call to HTML

I'm using AJAX to add more articles to a list of articles when you press a button. So my AJAX call returns data that includes a title, author and 1 to 3 images associated with the article. Below is the code I'm using to output it, but it feels VERY clunky.
What are the best practices for printing out HTML with JavaScript/jQuery in a scenario like this where I need to add many new tags with new information? Thanks for the help!
Also, I know some of the code isn't super well written because it's a first draft just to make stuff work, so please only answer this question with regards to printing out the HTML or things that will make printing the HTML easier
$j.getJSON(ajaxurl, {action: 'load_articles', issues: $issues}, function(data) {
if (data.message != null) {
alert(data.message);
return
}
list = $j('.all-articles ul');
for (i in data.articles) {
article = data.articles[i];
//Hides articles already on page
if ($j("#" + article.id).size() === 0) {
list.append('<li class="article-preview" id="' + article.id + '">' +
'<h3 class="article-headline">' + article.title + '</h3>' +
'</li>');
current = $j("#" + article.id)
current.append('<p class="authors"></p>');
authors = $j("#" + article.id + " .authors")
for (a in article.authors) {
authors.append(article.authors[a].data.display_name + " ");
}
current.append('<div class="images"></div>');
images = $j("#" + article.id + " .images")
for (i in article.image) {
text = "<div class='image-expand-container'>";
if (i == 0) {
text += ('<img id="' + article.image[i].id + '"class="selected" src="' + article.image[i].medium + '"></img>');
}
else {
text += ('<img id="' + article.image[i].id + '" src="' + article.image[i].medium + '"></img>');
}
text += '<div class="dashicons dashicons-editor-expand"></div></div>';
images.append(text);
}
}
}

There are a few approaches you can take.
As you're doing here, you can return data from your ajax call (e.g. as JSON) and then use a javascript function to generate the corresponding HTML by building strings. This, as you're finding, is often messy.
You can generate the actual HTML on the server side, and have the ajax call return an HTML fragment, which you insert into your DOM. This has the advantage that, if some of your HTML is loading when the page loads, and some is loading via ajax, you can use the same approach (PHP, XSLT, ASP.NET Razor, any kind of server-side templating) to generate all of the HTML.
You can use a javascript templating framework to turn your JSON data into HTML. If all of your HTML is being generated via javascript (e.g. in a single-page application) this may be your best bet.

Selecting an image isn't working

I got some troubles working on javascript for an Firefox OS app, so I hope anyone can help me.
The case is I append some images from javascript (see code)
var aux = "<img class=\"imageOn\" id=\"" + imageName + "\"" + "src:\"" + imageURL + "\" >";
var image = "<a class=\"imageOn\" href=\"#\"> " + aux + " </a>";
$("#categoriasList").append(image);
$('#'+imageName).attr('src',imageURL);
And now I want to select one of these images from another js file:
$("img.imageOn").bind('click', function(e) {
console.log($(this).attr('id'));
playText($(this).attr('id'),"es");
// Change to picturesView
// Load icons from category choosed
});
The point is that actually it isn't working, the event is not triggered, so apendding or selecting the images has to be wrong, but I don't find the error. Does anyone know how to fix it?
Thank you in advanced.

Your src attribute should be followed by a = not a :
"<img class=\"imageOn\" id=\"" + imageName + "\"" + "src=\"" + imageURL + "\" >";

This
"src:\"
Should probably be
"src=\"

You need a = instead of : in your src. Try this:
"<img class=\"imageOn\" id=\"" + imageName + "\"" + "src=\"" + imageURL + "\" >";

If your are using jQuery you can use following method.
var aux= $(document.createElement('img')).attr(
'id':imageName,
'src':imageURL,
'class':'imageOn'
),
image = $(document.createElement('a')).attr({
'class':'imageOn'
'href':'#',
});
image.html(aux);
$("#categoriasList").append(image);
And after appending you can attach event handler. If you attaching without creating actual element it will not be triggered. It means if you want to attach event handler in the different file you should be sure that all elements already created. Otherwise there will not be triggered.

I fixed it using the event handler "on" of query