So I am planning on dynamically changing a page's content by fetching it from another page.
To do so, I used Mootools' Request class:
var tabContent = new Request({
url: 'foo/bar/baz.php',
onSuccess: function(data) {
$('tab_container').innerHTML = data;
}
}).send();
In any case, the HTML is fetched fine, and returns without a hitch. However, I'd like to add some events to THOSE fetched elements (Fx.slide, to be precise), and that requires some js to be included in the requested file.
Upon inspection of the returned data, the javascript is intact. However, it does not show up in the final product. That is, somewhere in between having received the data, and rendering the data (via the innerHTML bit) it seems as though the javascript has been excised out for some reason.
Hm.
add evalScripts: true to the Request options, then include the script in a simple <script></script> block at the bottom of the response.
Related
I have several pages that are arrived on with valid GET data, such as http://website.com/?id=12345
I have a generic HTML form that is pulled onto many different pages using php's "require" and submits using POST. Regardless of which page this form is located on, it should always submit back to that same page. However, after the form is submitted, I would like the ?id=12345 to be stripped out.
So, for example, if the user is on http://website.com/new.php?id=12345, it should post back to http://website.com/new.php. If the user is on http://website.com/old.php?id=12345, that same form it should post back to old.php
Previously the best solution I found was to style the form as such:
<form action="?" method="POST">
Which will change all links to http://website.com/new.php? or http://website.com/old.php? which is very close, but not perfect.
As it turns out, I finally found the solution to my problem by using JavaScript:
url = location.href;
qindex = url.indexOf("?");
This can pull whatever is on the address bar as a string and find the index of the first ? mark. From there:
if(qindex != -1)
tells me that there is a ? mark
var plainUrl = url.substring(0, qindex);
Can get, as a string, everything up to the ? mark, but not after. Finally:
window.location.replace(plainUrl);
Will rewrite the address bar to the plain URL, not including the ? or whatever comes after, and without redirecting the browser.
Since your page will not undergo any server-side processing, you can achieve what you want via a combination of the following two tricks.
First, change your particular querystring to a hash, which is thereafter directly editable without triggering a page reload:
http://yourdomain.com/page.html#search=value
Then modify such a script as this to do what you want to do, according to the query string passed in.
<script type='text/javascript'>
// grab the raw "querystring"
var query = document.location.hash.substring(1);
// immediately change the hash
document.location.hash = '';
// parse it in some reasonable manner ...
var params = {};
var parts = query.split(/&/);
for (var i in parts) {
var t = part[i].split(/=/);
params[decodeURIComponent(t[0])] = decodeURIComponent(t[1]);
}
// and do whatever you need to with the parsed params
doSearch(params.search);
</script>
now you can delete the query string suffix in the following way:
As detailed elsewhere, namely hide variables passed in URL, it's possible to use JavaScript's History API in modern browsers.
history.replaceState({}, null, "/index.html");
That will cause your URL to appear as /index.html without reloading the page
This little gem is explained in more detail here:
https://developer.mozilla.org/en-US/docs/Web/API/History_API
Dumb question time. I was trying to integrate my JSON data with a flipbook plugin, using a Mustache templating system. Needless to say, this wasn't working at all.
I'm a jQuery noobie, so is there any easy way to bind and animate the JSON data to/with a plugin (with or without the Mustache tags)??
From your question it is a bit hard to deduce what you want, but I feel you got already all the pieces together. First the example you have been linking to in a comment: https://github.com/blasten/turn.js/wiki/Making-pages-dynamically-with-Ajax
This fetches not yet loaded pages via Ajax, and the sample code assumes the Ajax call gets HTML back from the server, as can be seen in the code snippet from there (after adding a missing '}':
$.ajax({url: "app?method=get-page-content&page="+page})
.done(function(data) {
element.html(data);
});
Here the done function processes the data it got back from the server by straight injecting it into the element, which is expected to contain the current page.
I assume next that you do have a server side method, but that method returns JSON instead. Let me assume for the moment that it returns the following structure:
{ "title" : "the title of page N",
"text" : "here is some text for the page N." }
The next thing is to render this JSON into into html in the done funktion, before inserting the result into the page. Looking at the short tutorial on the README.md this might look like:
$.ajax({url: "app?method=get-page-content&page="+page})
.done(function(data) {
var pageHtml = Mustache.render("<h2>{{title}}</h2><p>{{text}}</p>", data);
element.html(pageHtml);
});
If the server returns the proper data you should now see a
<h2>the title of page N</h2><p>here is some text for the page N.</p>
appear on the page.
I am loading a user-selected page into an iframe using the src property. If the load fails, I would like to report the problem in terms that will make sense to the user. iframe does not, in general, support onerror according to http://www.w3schools.com/jsref/dom_obj_frame.asp.
The page may come from the user's domain, not mine, so I cannot view the content of the iframe.
I can set a timeout and cancel it from my onload handler if the load is successful, but it would need to be a long timeout to avoid false error reports, and meanwhile Safari on my iPhone has displayed an alert that may confuse the user. Even this does not work for the Kindle Fire browser - it delivers a load event to my handler regardless of whether the load was successful.
Is there any event I can use to detect failure? Is there any way to suppress the default Safari behavior? Any way I can tell whether the load attempt has failed? (If I could do that, I could use a shorter timeout and poll until the load attempt is resolved).
I can require the use of up to date browsers, but would like a solution that is portable among as many smartphones and tablets as possible.
I have tested the AJAX Get idea, and it unfortunately does not work. A cross-domain AJAX Get to an arbitrary URI results in an exception, regardless of whether the target exists and can be loaded into the iframe or not.
You could set your iframe and/or ajax request to always call a page you control (ie: loader.php), sending loader.php the user's requested page via get. From loader.php, use curl or even just file_get_contents to fetch the external page. If the request fails to come back to loader.php, you can check the error there, and return whatever you want your iframe to display.
While my example references the use of php, curl is supported in a variety of scripting languages. It is likely more complicated than other solutions you might have, but would give you access to the response headers as well for troubleshooting why a page load failed.
As you've hinted, you'll face same-origin-policy type restrictions when you try to query anything inside the iframe if it's on a separate domain.
You could make an AJAX GET request to the iframe's URL before you pass it into the src of the frame. If you don't get an HTTP 200 response back from the AJAX call, then the site won't be able to load inside the frame either.
This will add overhead to the whole process, and is only useful if you're checking whether the iframe's document is a real URL that works. It won't help if you need to know when the iframe document has fully loaded.
If you need to know when the iframe has loaded, and it's on an external domain, then I believe you have no other option but to ask for some code to be added to those external sites to notify the parent page that they've loaded successfully.
Or, if it makes sense to do so, ask the end user to click a link to flag up that the content isn't loading correctly.
Late to the party, but I've managed to crack it:
At first, I thought to do an AJAX call like everyone else, except that it didn't work for me initially, as I had used jQuery. It works perfectly if you do a XMLHttpRequest:
var url = http://url_to_test.com/
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status != 200) {
console.log("iframe failed to load");
}
};
xhttp.open("GET", url, true);
xhttp.send();
Edit:
So this method works ok, except that it has a lot of false negatives (picks up a lot of stuff that would display in an iframe) due to cross-origin malarky. The way that I got around this was to do a CURL/Web request on a server, and then check the response headers for a) if the website exists, and b) if the headers had set x-frame-options.
This isn't a problem if you run your own webserver, as you can make your own api call for it.
My implementation in node.js:
app.get('/iframetest',function(req,res){ //Call using /iframetest?url=url - needs to be stripped of http:// or https://
var url = req.query.url;
var request = require('https').request({host: url}, function(response){ //This does an https request - require('http') if you want to do a http request
var headers = response.headers;
if (typeof headers["x-frame-options"] != 'undefined') {
res.send(false); //Headers don't allow iframe
} else {
res.send(true); //Headers don't disallow iframe
}
});
request.on('error',function(e){
res.send(false); //website unavailable
});
request.end();
});
I've been working on a custom CMS in drupal for about two or three weeks now, and I keep running into this same problem. I'm trying to load a dynamically generated url (by extracting the node id of the target drupal page into $resultCut and appending it to the baseurl of the website). This iframe is embedded next to an instance of CKEditor, and the idea is to have the content in the iframe change when the fields in CKEditor are modified. I have the following Jquery:
<script type="text/javascript">
$(document).ready(function(){
baseurl = urlhere;
url = baseurl+"<?php echo $resultCut ?>"
$('#EmuFrame').attr('src', url);
var HTML = $('#EmuFrame').contents().find('body').html();
alert ( "LOADING COMPLETE" + HTML );
});
$('#edit-field-mobile-page-header-label-0-value').change(function () { // writes changes to the header text to emulaor
var curr = $(this).val();
$('#EmuFrame').contents().find("h1").text(curr);
});
$('#edit-body').keyup(function(e) { // writes changes to the body text to emulator
var curr = $(this).val();
currhead = $('#EmuFrame').contents().find("h1").html();
$('#EmuFrame').contents().find('#content').html("<h1>"+currhead+"</h1>"+curr);
});
where #EmuFrame is the id of an iframe, and the #edit-* tags are the ids of fields in CKEditor that I am monitoring for change. When the user types, the keyup() or change() events is supposed to grab the new html and swap it with the html in the iframe.
As of right now, the LOADING COMPLETE alert fires, but there is no html in the alert. I noticed that the content of the iframe loads AFTER the alert fires, however, which is what led me to believe that it's a problem with the order in which the events trigger.
Further, I had an alert in the callback function of keyup that returned the new html [ alert(curr) ] that was generated when a user started typing, and this alert returns html (although, it is being grabbed from CKEditor). However, the iframe does not reflect any changes. If I append [ alert (currhead) ] though, nothing is alerted at all.
It might be of interest to note that the source url is technically on a different domain than the parent. however, I used a workaround (i'm pretty sure it works, because I've previously gotten the whole html replacement thing working, and then somehow it broke). Also, neither Firebug nor Chrome's console report any XMLHttpRequest errors. Also, I keep getting this error: "Uncaught Syntax error, unrecognized expression: [#disabled]" and I'm not sure what it means, and whether its relevant to my problem as stated above.
That was a ridiculously long plea for help, so THANKS FOR READING, and thank you for any help!!
Your note about about the cross-domain iframe src is worrisome -- you shouldn't be able to access its contents with javascript. Nevertheless:
You have these two lines in quick succession:
$('#EmuFrame').attr('src', url);
var HTML = $('#EmuFrame').contents().find('body').html();
Try waiting for the iframe to load first:
$('#EmuFrame').load(function() {
var HTML = $('#EmuFrame').contents().find('body').html();
}
i'm trying things out with a html document's dom (under visualbasic6) and i was wondering:
how can i get the full html sourcecode including all headers?
is there something like document.all.value?
thanks
If all you have is a DOM, there is no way to retrieve the original source, much less the response headers. It's gone. The DOM is what was generated from the source, which was thrown away thereafter.
If you must have the original source and headers, you will have to fetch it again from the server, using the location object to get the URL. For example from inside a web page script:
var req= 'XMLHttpRequest' in window? new XMLHttpRequest() : new ActiveXObject('MSXML2.XMLHttpRequest');
req.onreadystatechange= function() {
if (this.readyState===4) {
alert('Headers: '+this.getAllResponseHeaders());
alert('Body: '+this.responseText);
}
};
req.open('get', location.href);
req.send(null);
Clearly this will only work for a page generated from a GET request.