I'm working to modify some content which is dynamically loaded via another script(let's call is script #1) onto my site. Script #1 loads some markup and content and I've been using the setTimeout() function to call my script (Script #2) using a delay of a few seconds, in order to wait to be sure that Script #1 has executed and the content is present in the DOM.
My issue is that Script#1 has different loading times, based on the server load and can be slow or fast depending on these factors, and right now, playing it safe with setTimeout() I'm often left with a second or two where my scripts are still waiting to be fired and Script #1 has already loaded the content.
How can I execute my script as soon as Script#1 successfully loads it's dynamic content?
I've found this post which does seem to address the same issue but using the setInterval function as #Matt Ball has laid out there doesn't work at all for some reason. I'm using the code below where 'div.enrollment' is meant to find in the DOM which is dynamically loaded and execute..
jQuery(window).load(function ($)
{
var i = setInterval(function ()
{
if ($('div.enrollment').length)
{
clearInterval(i);
// safe to execute your code here
console.log("It's Loaded");
}
}, 100);
});
Any help on guidance on this would be greatly appreciated! Thanks for your time.
It seems that the healcode.js is doing a lot of stuff. There is a whole lot of markup added to the <healcode-widget> tag.
I would try to add another tag with an id inside and test for its existence:
<healcode-widget ....><div id="healCodeLoading"></div></healcode-widget>
Test in an interval for the existence of healCodeLoading inside <healcode-widget>: (Assuming jQuery)
var healCodeLoadingInterval = setInterval(function(){
var healCodeLoading = jQuery('healcode-widget #healCodeLoading');
if (healCodeLoading.length == 0) {
clearInterval(healCodeLoadingInterval);
// Everything should be loaded now, so you can do something here
}
}, 100);
healcode.js should replace everything inside <healcode-widget></healcode-widget> during init. So, if your <div>-element is no longer inside, the widget has loaded and initialized.
Hope that helps.
If you just want to load some markup and content and then run some script afterwards, you can use jQuery. You should use something like the following in script#1 to run a function in script#2
$.get( "ajax/test.html", function( data ) {
// Now you can do something with your data and run other script.
console.log("It's Loaded");
});
The function is called, after ajax/test.html is loaded.
Hope that helps
Related
One screen I have needs to render entirely before it calls ajax to start a long-running task. I.e. loading the layout before loading in a report that takes 10+ seconds (relies on web services).
I can do this by adding a separate script to the page and calling the Ajax when that script is loaded, but is that the best design? E.g.
_myreport.js:
$( document ).ready(function() {
var report = {
load: function() {
//test for report-container and run Ajax load if it exists
}
}
report.load();
});
I might have several pages for this and I don't particularly like having multiple scripts for multiple different pages. Or I might want to re-use scripts across multiple pages when the Ajax call may or may not be required (and the container may or may not exist). I can check for the existence of the container before running the Ajax but to me this doesn't feel like a good design. I'd like to call it when required, not call it every page load and then test if it's applicable via the container existing.
I tried putting a small call to the function in the body after the container, but this results in an error as the report.load() function has not yet been defined:
template.phtml
<div id='report-container'></div>
<script>
$( document ).ready(function() {
report.load();
});
</script>
What is a common/standard and clean way of doing this that I can re-use across multiple applications?
report.load has not been defined because it's warped in $( document ).ready.
You are trying to call it after the report-container has loaded but before entire DOM has.
If you declare your ajax loading function outside of $( document ).ready, it will be avalable.
Same with the call to it, you are running a script after the div loads, but becouse it's wrapped in $.ready, instead of executing right away, it waits for the rest to load...
Something like this should work
// not wrapped in $( document ).ready
var report = {
load: function() {
// not sure if you need to test for container, this function is called after it loads
//run Ajax
}
}
<div id='report-container'></div>
<script>
// not wrapped in $( document ).ready
report.load();
</script>
I'm using the $.get() function to extract some data from my site. Everything works great however on one of the pages the information I need to extract is dynamically created and then inserted into a <div> tag.
So in the <script> tag, a function is run and then the data is inserted into <div id="infoContainer"></div>. I need to get the information from #infoContainer, however when I try to do so in the $.get() function, it just says it's empty. I have figured out that it is because the <script> tag is not being run. Is there another way to do this?
Edit:I am making a PhoneGap application for my site using jQuery to move content around so it's more streamlined for mobiles.
This is the code on my page:
$(document).ready(function () {
var embedTag = document.createElement("embed");
var infoContainer = document.getElementById("infoContainer");
if (infoContainer != null) {
embedTag.setAttribute("height", "139");
embedTag.setAttribute("width", "356");...other attributes
infoContainer.appendChild(embedTag);
});
});
As you can see, it puts content into the #infoContainer tag. However, when I try to extract info from that tag through the get function it shows it as empty.I have done the same to extract headings and it works great. All I can gather is the script tag is not firing.
This should provide you the contents of the element:
$('#infoContainer').html();
Maybe your script is executing before the DOM is loaded.
So if you are manipulating DOM elements you should wait till DOM is loaded to manipulate it. Alternately you can place your script tag at the end of your HTML document.
// These three are equivalent, choose one:
document.addEventListener('DOMContentLoaded', initializeOrWhatever);
$( initializeOrWhatever );
$.ready( initializeOrWhatever );
function initializeOrWhatever(){
// By the time this is called, the DOM is loaded and you can read/write to it
$.getJSON('/foo/', { myData: $('#myInput').val() }, onResponse);
function onResponse(res){
$(document).html('<h1>Hello '+res+'</h1>');
};
};
Otherwise... post more specifics and code
You have no ID to reference. Try setting one before you append
embedTag.setAttribute("id", "uniqueID");
It looks like you are wanting to use jQuery, but your example code has vanilla JavaScript. Your entire function can be simplified using the following jQuery (jsFiddle):
(function () {
var embedTag = $(document.createElement("embed"));
var infoContainer = $("#infoContainer");
if (infoContainer.length) {
embedTag.attr({"height": 139, "width": 356});
infoContainer.append(embedTag);
}
console.log(infoContainer.html()); // This gets you the contents of #infoContainer
})();
jQuery's .get() method is for sending GET requests to a server-side script. I don't think it does what you are wanting to do.
I have the following problem: on a customer's homepage the navibar is loaded by javascript, but I need to change some URL's on it. If I just start my script on $(document).ready() it runs before the customers script and has no effect. I only can use setTimeout for my function to wait until the other script is ready, but it's not good or safe at all. I can't change anything on the website, only add a javascript - is there a way to time it after the other one?
You can use repeated setTimeout, in order to check if menu is accessible.
function check_menu(){
if(document.getElementById('my_menu')==null){
setTimeout('check_menu()',500);
} else {
//do some stuff
}
}
If you have information about the menu like the id or class, use the onLoad() jQuery method on the element. For example if the code is loading asynchronously, and you add the onload to one of the last elements it should fire after the content has finished.
$.post('AsyncCodeLoad.php', function(data) {
$('#lastElementToLoad').onLoad(RunMyFunction);
});
Or if you have no chance to insert your code into the async loading just add to the bottom of the </body>:
$('#lastElementToLoad').onLoad(RunMyFunction);
Just a thought.
Yes, add your script at the bottom of the <body /> tag to ensure it does not run until all other scripts have run. This will only work however if your customer is loading the nav links synchronously.
If the nav is being loaded asynchronously, use JS's setInterval to repeatedly check the contents of the nav for links. When you determine the links have been added, cancel your interval check and call your script's logic entry point.
Cheers
Fiddle: http://jsfiddle.net/iambriansreed/xSzjA/
JavaScript
var
menu_fix = function(){
var menu = $('#menu');
if(menu.length == 0) return;
clearInterval(menu_fix_int);
$('a', menu).text('Google Search').attr('href','http://google.com');
},
menu_fix_int = setInterval(menu_fix, 100);
HTML
<div id="menu">Bing Search</div>
I am trying to load Skyscanner API dynamically but it doesn't seem to work. I tried every possible way I could think of and all it happens the content disappears.
I tried console.log which gives no results; I tried elements from chrome's developers tools and while all the content's css remains the same, still the content disappears (I thought it could be adding display:none on the html/body sort of). I tried all Google's asynch tricks, yet again blank page. I tried all js plugins for async loading with still the same results.
Skyscanner's API documentation is poor and while they offer a callback it doesn't work the way google's API's callback do.
Example: http://jsfiddle.net/7TWYC/
Example with loading API in head section: http://jsfiddle.net/s2HkR/
So how can I load the api on button click or async? Without the file being in the HEAD section. If there is a way to prevent the document.write to make the page blank or any other way. I wouldn't mind using plain js, jQuery or PHP.
EDIT:
I've set a bounty to 250 ontop of the 50 I had previously.
Orlando Leite answered a really close idea on how to make this asynch api load although some features doesn't work such as selecting dates and I am not able to set styling.
I am looking for an answer of which I will be able to use all the features so that it works as it would work if it was loading on load.
Here is the updated fiddle by Orlando: http://jsfiddle.net/cxysA/12/
-
EDIT 2 ON Gijs ANSWER:
Gijs mentioned two links onto overwriting document.write. That sounds an awesome idea but I think it is not possible to accomplish what I am trying.
I used John's Resig way to prevent document.write of which can be found here: http://ejohn.org/blog/xhtml-documentwrite-and-adsense/
When I used this method, I load the API successfuly but the snippets.js file is not loading at all.
Fiddle: http://jsfiddle.net/9HX7N/
I belive what you want is it:
function loadSkyscanner()
{
function loaded()
{
t.skyscanner.load('snippets', '1', {'nocss' : true});
var snippet = new t.skyscanner.snippets.SearchPanelControl();
snippet.setCurrency('GBP');
snippet.setDeparture('uk');
snippet.draw(document.getElementById('snippet_searchpanel'));
}
var t = document.getElementById('sky_loader').contentWindow;
var head = t.document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.onreadystatechange= function() {
if(this.readyState == 'complete') loaded();
}
script.onload= loaded;
script.src= 'http://api.skyscanner.net/api.ashx?key=PUT_HERE_YOUR_SKYSCANNER_API_KEY';
head.appendChild(script);
}
$("button").click(function(e)
{
loadSkyscanner();
});
It's load skyscanner in iframe#sky_loader, after call loaded function to create the SearchPanelControl. But in the end, snippet draws in the main document. It's really a bizarre workaround, but it works.
The only restriction is, you need a iframe. But you can hide it using display:none.
A working example
EDIT
Sorry guy, I didn't see it. Now we can see how awful is skyscanner API. It puts two divs to make the autocomplete, but not relative to the element you call to draw, but the document.
When a script is loaded in a iframe, document is the iframe document.
There is a solution, but I don't recommend, is really a workaround:
function loadSkyscanner()
{
var t;
this.skyscanner;
var iframe = $("<iframe id=\"sky_loader\" src=\"http://fiddle.jshell.net/orlleite/2TqDu/6/show/\"></iframe>");
function realWorkaround()
{
var tbody = t.document.getElementsByTagName("body")[0];
var body = document.getElementsByTagName("body")[0];
while( tbody.children.length != 0 )
{
var temp = tbody.children[0];
tbody.removeChild( temp );
body.appendChild( temp );
}
}
function snippetLoaded()
{
skyscanner = t.skyscanner;
var snippet = new skyscanner.snippets.SearchPanelControl();
snippet.setCurrency('GBP');
snippet.setDeparture('uk');
snippet.draw(document.getElementById('snippet_searchpanel'));
setTimeout( realWorkaround, 2000 );
}
var loaded = function()
{
console.log( "loaded" );
t = document.getElementById('sky_loader').contentWindow;
t.onLoadSnippets( snippetLoaded );
}
$("body").append(iframe);
iframe.load(loaded);
}
$("button").click(function(e)
{
loadSkyscanner();
});
Load a iframe with another html who loads and callback when the snippet is loaded. After loaded create the snippet where you want and after set a timeout because we can't know when the SearchPanelControl is loaded. This realWorkaround move the autocomplete divs to the main document.
You can see a work example here
The iframe loaded is this
EDIT
Fixed the bug you found and updated the link.
the for loop has gone and added a while, works better now.
while( tbody.children.length != 0 )
{
var temp = tbody.children[0];
tbody.removeChild( temp );
body.appendChild( temp );
}
For problematic cases like this, you can just overwrite document.write. Hacky as hell, but it works and you get to decide where all the content goes. See eg. this blogpost by John Resig. This ignores IE, but with a bit of work the trick works in IE as well, see eg. this blogpost.
So, I'd suggest overwriting document.write with your own function, batch up the output where necessary, and put it where you like (eg. in a div at the bottom of your <body>'). That should prevent the script from nuking your page's content.
Edit: OK, so I had/took some time to look into this script. For future reference, use something like http://jsbeautifier.org/ to investigate third-party scripts. Much easier to read that way. Fortunately, there is barely any obfuscation/minification at all, and so you have a supplement for their API documentation (which I was unable to find, by the way -- I only found 'code wizards', which I had no interest in).
Here's an almost-working example: http://jsfiddle.net/a8q2s/1/
Here's the steps I took:
override document.write. This needs to happen before you load the initial script. Your replacement function should append their string of code into the DOM. Don't call the old document.write, that'll just get you errors and won't do what you want anyway. In this case you're lucky because all the content is in a single document.write call (check the source of the initial script). If this weren't the case, you'd have to batch everything up until the HTML they'd given you was valid and/or you were sure there was nothing else coming.
load the initial script on the button click with jQuery's $.getScript or equivalent. Pass a callback function (I used a named function reference for clarity, but you can inline it if you prefer).
Tell Skyscanner to load the module.
Edit #2: Hah, they have an API (skyscanner.loadAndWait) for getting a callback once their script has loaded. Using that works:
http://jsfiddle.net/a8q2s/3/
(note: this still seems to use a timeout loop internally)
In the skyrunner.js file they are using document.write to make the page blank on load call back... So here are some consequences in your scenario..
This is making page blank when you click on button.
So, it removes everything from page even 'jQuery.js' that is why call back is not working.. i.e main function is cannot be invoked as this is written using jQuery.
And you have missed a target 'div' tag with id = map(according to the code). Actually this is the target where map loads.
Another thing i have observed is maps is not actually a div in current context, that is maps api to load.
Here you must go with the Old school approach, That is.. You should include your skyrunner.js file at the top of the head content.
So try downloading that file and include in head tag.
Thanks
I have a very bare HTML page that loads two JS files. One of these JS files then goes and loads a varying amount of content into the page.
I'm trying to get the equivalent of window.onload for this extra content. Obviously, window.onload actually fires very quickly, when the page is done loading the two JS files.
Any ideas? I know I can go and attach onload events to every image/script/etc on the page, but would rather not...
EDIT. If the callback won't help .load should do the job. I've added it to the example.
In this case you need a call back. Are you using a JavaScript library? if so what library?
In your existing code, after you append to the document you need to call a function that can execute the next bit of code.
something like this.
//FILE 1
$(function () {
$('body').append(someHTMLOrDOMNodes);
//I don't know what your second script does, but you should name this callback something relevant.
$('#idOfNewContent').load(function() {
callback();
});
});
//FILE 2
function callback() {
//next bit of code.
}