Develop Reference

Ajax Loader showing twice in function

I have created a fiddle here...https://jsfiddle.net/qukhn4uk/
As you can see, I have an object for clicking on a grid image that opens a flyout and loads that person's data through ajax (you won't see the data load in the fiddle obviously but you get the idea). Everything works good here. The object that handles this is:
Stories = {
flyout: '#flyout',
closeFlyout: '#flyout .close-flyout',
storyTrigger: '.story .story-trigger',
ajaxContentContainer: '#flyout .content',
loader: '<i class="fa fa-spin fa-spinner"></i>',
body: 'body',
init: function() {
$(this.storyTrigger).click(this.showStory.bind(this));
$.ajaxSetup({cache:false});
$(document).on("click", this.closeFlyout, this.closeStory.bind(this));
},
showStory: function(e) {
e.preventDefault();
var target = $(e.target),
targetName = target.data("name");
$(this.flyout).css("transform", "translateX(-100%)");
$(this.body).css("overflow", "hidden");
$(this.ajaxContentContainer).append(this.loader);
$(this.ajaxContentContainer).load("/story/" + targetName);
},
closeStory: function() {
$(this.flyout).css("transform", "translateX(100%)");
$(this.ajaxContentContainer).empty();
$(this.body).css("overflow", "auto");
}
}
I then have another load function for opening the flyout and loading the data based on a hash in the url. This is the object that handles that...
DirectStory = {
storyDiv: '.story',
init: function() {
var self = this;
if ( window.location.hash != '' ) {
$(this.loadStory.bind(this));
}
$.ajaxSetup({cache:false});
},
loadStory: function() {
var hash = window.location.hash,
story = hash.substring(1);
targetStory = $(this.storyDiv).find("[data-name='" + story + "']");
targetStory.click();
}
}
Everything works great but there is one tiny glitch. For some reason, the DirectStory object is causing the ajaxLoader from the Stories object to load twice. Can someone help me figure out why this is happening? Thanks!
UPDATE: I have figured out that the targetStory.click() is running twice inside of the DirectStory object. I have tried to unbind it first but that does not help. Why is it running twice?

I have solved this for anyone who lands here...
The targetStory variable was finding two triggers with the way I was storing it.
I simply updated the targetStory variable to...
targetStory = $(".full-link[data-name='" + story + "']");

Jquery .change() event fires only once

So I'm fairly novice with jquery and js, so I apologise if this is a stupid error but after researching I can't figure it out.
So I have a list of data loaded initially in a template, one part of which is a dropdown box that lets you filter the data. My issue is that the filtering only works once? As in, the .change function inside $(document).ready() only fires the once.
There are two ways to reload the data, either click the logo and reload it all, or use the search bar. Doing either of these at any time also means the .change function never fires again. Not until you refresh the page.
var list_template, article_template, modal_template;
var current_article = list.heroes[0];
function showTemplate(template, data)
{
var html = template(data);
$("#content").html(html);
}
$(document).ready(function()
{
var source = $("#list-template").html();
list_template = Handlebars.compile(source);
source = $("#article-template").html();
article_template = Handlebars.compile(source);
source = $("#modal-template").html();
modal_template = Handlebars.compile(source);
showTemplate(list_template,list);
$(".articleButton").click(function()
{
var index = $(this).data("id");
current_article = list.heroes[index];
showTemplate(article_template,current_article);
$('.poseThumb').click(displayModal);
});
$("#classFilter").change(function()
{
console.log("WOW!");
var classToFilter = this.value;
var filteredData =
{
heroes: list.heroes.filter(function(d)
{
if (d.heroClass.search(classToFilter) > -1)
{
return true;
}
return false;
})
};
console.log(filteredData);
showTemplate(list_template,filteredData);
$(".articleButton").click(function()
{
var index = $(this).data("id");
current_article = filteredData.heroes[index];
showTemplate(article_template,current_article);
$('.poseThumb').click(displayModal);
});
});
$("#searchbox").keypress(function (e)
{
if(e.which == 13)
{
var rawSearchText = $('#searchbox').val();
var search_text = rawSearchText.toLowerCase();
var filteredData =
{
heroes: list.heroes.filter(function(d)
{
if (d.name.search(search_text) > -1)
{
return true;
}
return false;
})
};
console.log(filteredData);
showTemplate(list_template,filteredData);
$(".articleButton").click(function()
{
var index = $(this).data("id");
current_article = filteredData.heroes[index];
showTemplate(article_template,current_article);
$('.poseThumb').click(displayModal);
});
}
});
$("#logo").click(function()
{
showTemplate(list_template,list);
$(".articleButton").click(function()
{
var index = $(this).data("id");
current_article = list.heroes[index];
showTemplate(article_template,current_article);
$('.poseThumb').click(displayModal);
});
});
//$("#logo").click();
});
function displayModal(event)
{
var imageNumber = $(this).data("id");
console.log(imageNumber);
var html = modal_template(current_article.article[0].vicPose[imageNumber]);
$('#modal-container').html(html);
$("#imageModal").modal('show');
}
I should note two things: first, that the search bar works perfectly, and the anonymous function inside both of them is nearly identical, and like I said, the filtering works perfectly if you try it after the initial load. The second is that the same problem occurs replacing .change(anonymous function) with .on("change",anonymous function)
Any help or advice would be greatly appreciated. Thanks.

I agree with Fernando Urban's answer, but it doesn't actually explain what's going on.
You've created a handler attached to an HTML element (id="classFilter") which causes part of the HTML to be rewritten. I suspect that the handler overwrites the HTML which contains the element with the handler on it. So after this the user is clicking on a new HTML element, which looks like the old one but doesn't have a handler.
There are two ways round this. You could add code inside the handler which adds the handler to the new element which has just been created. In this case, that would mean making the handler a named function which refers to itself. Or (the easier way) you could do what Fernando did. If you do this, the event handler is attached to the body, but it only responds to clicks on the #classFilter element inside the body. In other words, when the user clicks anywhere on the body, jQuery checks whether the click happened on a body #classFilter element. This way, it doesn't matter whether the #classFilter existed when the handler was set. See "Direct and delegated events" in jQuery docs for .on method.

Try to use some reference like 'body' in the event listeners inside your DOM like:
$('body').on('click','.articleButton', function() {
//Do your stuff...
})
$('body').on('click','#classFilter', function() {
//Do your stuff...
})
$('body').on('keypress','#searchbox', function() {
//Do your stuff...
})
$('body').on('click','#logo', function() {
//Do your stuff...
})
This will work that you can fire it more than once.

automatic clicks on links and doing something with every page's DOM

i have some links in a web page ,what i want to do :
Trigger click event on every link
When the page of every link is loaded , do something with page's DOM(fillProducts here)
What i have tried :
function start(){
$('.category a').each(function(i){
$.when($(this).trigger('click')).done(function() {
fillProducts() ;
});
})
}
Thanks

What you want to do is much more complicated than you seem to be giving it credit for. If you could scrape webpages, including AJAX content, in 7 lines of js in the console of a web browser you'd put Google out of business.
I'm guessing at what you want a bit, but I think you want to look at using a headless browser, e.g. PhantomJs. You'll then be able to scrape the target pages and write the results to a JSON file (other formats exist) and use that to fillProducts - whatever that does.
Also, are you stealing data from someone else's website? Cause that isn't cool.

Here's a solution that may work for you if they are sending their ajax requests using jQuery. If they aren't you're going to need to get devilishly hacky to accomplish what you're asking (eg overriding the XMLHttpRequest object and creating a global observer queue for ajax requests). As you haven't specified how they're sending the ajax request I hope this approach works for you.
$.ajaxSetup({
complete: function(jQXHR) {
if(interested)
//do your work
}
});
The code below will click a link, wait for the ajax request to be sent and be completed, run you fillProducts function and then click the next link. Adapting it to run all the clicks wouldn't be difficult
function start(){
var links = $('.category a');
var i = 0;
var done = function() {
$.ajaxSetup({
complete: $.noop//remove your handler
});
}
var clickNext = function() {
$(links.get(i++)).click();//click current link then increment i
}
$.ajaxSetup({
complete: function(jQXHR) {
if(i < links.length) {
fillProducts();
clickNext();
} else {
done();
}
}
});
clickNext();
}
If this doesn't work for you try hooking into the other jqXHR events before hacking up the site too much.
Edit here's a more reliable method in case they override the complete setting
(function() {
var $ajax = $.ajax;
var $observer = $({});
//observer pattern from addyosmani.com/resources/essentialjsdesignpatterns/book/#observerpatternjquery
var obs = window.ajaxObserver = {
subscribe: function() {
$observer.on.apply($observer, arguments);
},
unsubscribe: function() {
$observer.off.apply($observer, arguments);
},
once: function() {
$observer.one.apply($observer, arguments);
},
publish: function() {
$observer.trigger.apply($observer, arguments);
}
};
$.ajax = function() {
var $promise = $ajax.apply(null, arguments);
obs.publish("start", $promise);
return $promise;
};
})();
Now you can hook into $.ajax calls via
ajaxObserver.on("start", function($xhr) {//whenever a $.ajax call is started
$xhr.done(function(data) {
//do stuff
})
});
So you can adapt the other snippet like
function start(){
var links = $('.category a');
var i = 0;
var clickNextLink = function() {
ajaxObserver.one("start", function($xhr) {
$xhr.done(function(data) {
if(i < links.length) {
fillProducts();
clickNextLink();
} else {
done();
}
});
})
$(links.get(i++)).click();//click current link then increment i
}
clickNextLink();
}

try this:
function start(){
$('.category a').each(function(i){
$(this).click();
fillProducts() ;
})
}

I get ya now. This is like say:
when facebook loads, I want to remove the adverts by targeting specific class, and then alter the view that i actually see.
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/
Is a plugin for firefox, this will allow you to create a javascript file, will then allow you to target a specific element or elements within the html rendered content.
IN order to catch the ajax request traffic, you just need to catcher that within your console.
I can not give you a tutorial on greasemonkey, but you can get the greasemonkey script for facebook, and use that as a guide.
http://mashable.com/2008/12/25/facebook-greasemonkey-scripts/
hope this is it

Loading GIF while AJAX completes

This should be quite simple but I'll be darned if I can work it out. Just trying to get a div to display while my ajax is processing and then hide once done (I've put a sleep in there purely to test its working as locally it loads so fast I'm not sure if its working or not)!
The html page has this code in the script: -
$(document).ready(function(){
$("#loadingGIF").ajaxStart(function () {
$(this).show();
});
$("#loadingGIF").ajaxStop(function () {
window.setTimeout(partB,5000)
$(this).hide();
});
function partB(){
//just because
}
var scenarioID = ${testScenarioInstance.id}
var myData = ${results as JSON}
populateFormData(myData, scenarioID);
});
There is then a div in my page like so (which I can see in the source of the page just hidden): -
<div id="loadingGIF" ><img src='${application.contextPath}/images/spinner.gif' height="50" width="50"></div>
The ready code then goes off and calls this: -
function populateFormData(results, scenarioID) {
$table = $('#formList')
for(var i in results){
var formIDX = (results[i]["forms_idx"])
var formID = (results[i]["form_id"])
appendSubTable(formIDX, scenarioID, $table, formID);
}
}
Which references this multiple times calling several AJAX posts: -
function appendSubTable(formIDX, scenarioID, $table, formID) {
var $subTable = $table.find("#" + formIDX).find('td:eq(1)').find("div").find("table")
var url = "**Trust me this bits OK ;) **"
$.post(url, {
formIDX : formIDX, scenarioID : scenarioID, formID :formID
}, function(data) {
$subTable.append(data)
}).fail(function() {
});
}
Any pointers gratefully received...
Interestingly I bunged some alerts into my ajaxstart and stop and neither show up ever so I'm missing something obvious :S When I check the console in firefox I can see that all my POSTs are completing....

You should probably add the Ajaxstart and stop global event handlers to the document node like this
$(document).ajaxStart(function () {
$("#loadingGIF").show();
});

I realized my problem, I needed to register the ajaxstart and stop to the document not the div!
So instead of this: -
$("#loadingGIF").ajaxStart(function () {
$(this).show();
});
I now have: -
$(document).ajaxStart(function () {
$("#loadingGIF").show();
});
I assume this is because its the document that the ajax is running against not the div although my understanding there may not be 100% accurate at least this works so please tell me if I've misunderstood this! :)
#jbl, thanks for this pointer I did this to also leave the notification on screen for a few more moments just to make sure everything is loaded.

How to determine if content in popup window is loaded

I need to set some contextData for a popup window from its parent. I try this:
var some contextData = {};
$(function() {
$('#clickme').click(function() {
var w = window.open('http://jsfiddle.net');
w.contextData = contextData
//w.context data is null in the popup after the page loads - seems to get overwritten/deleted
});
});
It doesn't work, so my next thought, wait until content is loaded
var some contextData = {};
$(function() {
$('#clickme').click(function() {
var w = window.open('http://jsfiddle.net');
w.onload = function() {
//Never Fires
w.contextData = contextData;
}
});
});
See this fiddle. My onload method never fires.
This works:
var some contextData = {};
$(function() {
$('#clickme').click(function() {
var w = window.open('http://jsfiddle.net');
setTimeout(function(){
if(w.someVariableSetByThePageBeingLoaded) {
w.contextData = contextData;
}
else{
setTimeout(arguments.callee, 1);
}
}, 1);
});
});
But has obvious elegance problems (but is the current work around).
I know you can go the other way (have the popup call back to a method on the opener/parent, but this forces me to maintain some way of looking up context (and I have to pass the key to the context to the popup in the query string). The current method lets me capture the context in a closure, making my popup a much more reusable piece of code.
I am not trying to do this cross domain - both the parent and popup are in the same domain, although the parent is an iframe (hard to test with jsfiddle).
Suggestions?

If you are doing this with an iframe try it this way
HTML
<button id="clickme">Click Me</button>
<iframe id="framer"></iframe>
​
Javascript
$(function() {
$('#clickme').click(function() {
$("#framer").attr("src","http://jsfiddle.net");
$("#framer")[0].onload = function(){
alert('loaded');
};
});
});​
I updated your jsfiddle http://jsfiddle.net/HNvn3/2/
EDIT
Since the above is completely wrong this might point you in the right direction but it needs to be tried in the real environment to see if it works.
The global variable frames should be set and if you
window.open("http://jsfiddle.net","child_window");
frames["child_window"] might refer to the other window
I got javascript access errors when trying it in jsfiddle - so this might be the right track
EDIT2
Trying out on my local dev box I was able to make this work
var w = window.open("http://localhost");
w.window.onload = function(){
alert("here");
};
the alert() happened in the parent window