We'd like to show a "Loading..." image when the page is still being transferred. Pages can get quite large in our application. I tried with a separate page that displays the image and then loads the intended page, but the animated GIF just stops.
Can something be done on the page itself?
Or is there a better way?
Thanks for your comments, as always!
UPDATE
Here's the general idea of my small switching page:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core" xmlns:xc="http://www.ibm.com/xsp/custom">
<xp:div
style="width:84.0px;height:84.0px;position:fixed;top:50%;left:50%;margin-top:0px;margin-left:0px;height:0px;width:0px;z-index:1000"
id="AjaxLoader">
<xp:image url="/loading.gif" id="image1">
</xp:image>
</xp:div>
<xp:scriptBlock id="scriptBlock1">
<xp:this.value><![CDATA[XSP.addOnLoad(function() {
var href= getParameterByName("href");
location.href= href;
});]]></xp:this.value>
</xp:scriptBlock>
</xp:view>
Loading a "loading" page prior than the one you want to load is not an option.
You can create to DIVs in your HTML: one for the loading icon (e.g. with id="loadingIcon"), second one for the content (id="contentWrapper"). The second one is hidden (CSS style="display:none").
Define a Javascript function like this:
function pageLoaded(){
document.getElementById("loadingIcon").style.display = "none";
document.getElementById("contentWrapper").style.display = "";
}
The script is called in the BODY's onLoad event like this:
<body onload="pageLoaded()">
...
</body>
It is not a question of the web-server environment, but how you organize your code :-)
Take your approach and modify it slightly. Instead of location.href = href - which just triggers a reload, use an ajax call and replace your loading div. Something like this:
<xp:scriptBlock id="scriptBlock1">
<xp:this.value><![CDATA[XSP.addOnLoad(function() {
var href= getParameterByName("href");
$.ajax({
url: "test.html",
context: $("#{id:AjaxLoader}");
}).done(function(result) {
$( this ).replace(result);
});
location.href= href;
});]]></xp:this.value>
</xp:scriptBlock>
(contains typos, adjust as needed)
To answer my own question: No, it's not possible, but there is a nice way around this, in my case anyway.
The trick is to open a new browser window, write something in it and then allow the new page to load.
var w= window.open();
w.document.write("<div style='position: fixed; top: 48%; left:40%'>Loading...</div>");
w.location.href= url;
If necessary the text can be replaced by an image and the new url can be set after a timeout.
Related
Is it possible to change styles of a div that resides inside an iframe on the page using CSS only?
You need JavaScript. It is the same as doing it in the parent page, except you must prefix your JavaScript command with the name of the iframe.
Remember, the same origin policy applies, so you can only do this to an iframe element which is coming from your own server.
I use the Prototype framework to make it easier:
frame1.$('mydiv').style.border = '1px solid #000000'
or
frame1.$('mydiv').addClassName('withborder')
In short no.
You can not apply CSS to HTML that is loaded in an iframe, unless you have control over the page loaded in the iframe due to cross-domain resource restrictions.
Yes. Take a look at this other thread for details:
How to apply CSS to iframe?
const cssLink = document.createElement("link");
cssLink.href = "style.css";
cssLink.rel = "stylesheet";
cssLink.type = "text/css";
frames['frame1'].contentWindow.document.body.appendChild(cssLink);
// ^frame1 is the #id of the iframe: <iframe id="frame1">
You can retrieve the contents of an iframe first and then use jQuery selectors against them as usual.
$("#iframe-id").contents().find("img").attr("style","width:100%;height:100%")
$("#iframe-id").contents().find("img").addClass("fancy-zoom")
$("#iframe-id").contents().find("img").onclick(function(){ zoomit($(this)); });
Good Luck!
The quick answer is: No, sorry.
It's not possible using just CSS. You basically need to have control over the iframe content in order to style it. There are methods using javascript or your web language of choice (which I've read a little about, but am not to familiar with myself) to insert some needed styles dynamically, but you would need direct control over the iframe content, which it sounds like you do not have.
Use Jquery and wait till the source is loaded,
This is how I have achieved(Used angular interval, you can use javascript setInterval method):
var addCssToIframe = function() {
if ($('#myIframe').contents().find("head") != undefined) {
$('#myIframe')
.contents()
.find("head")
.append(
'<link rel="stylesheet" href="app/css/iframe.css" type="text/css" />');
$interval.cancel(addCssInterval);
}
};
var addCssInterval = $interval(addCssToIframe, 500, 0, false);
Combining the different solutions, this is what worked for me.
$(document).ready(function () {
$('iframe').on('load', function() {
$("iframe").contents().find("#back-link").css("display", "none");
});
});
Apparently it can be done via jQuery:
$('iframe').load( function() {
$('iframe').contents().find("head")
.append($("<style type='text/css'> .my-class{display:none;} </style>"));
});
https://stackoverflow.com/a/13959836/1625795
probably not the way you are thinking. the iframe would have to <link> in the css file too. AND you can't do it even with javascript if it's on a different domain.
Not possible from client side . A javascript error will be raised "Error: Permission denied to access property "document"" since the Iframe is not part of your domaine.
The only solution is to fetch the page from the server side code and change the needed CSS.
A sort of hack-ish way of doing things is like Eugene said. I ended up following his code and linking to my custom Css for the page. The problem for me was that, With a twitter timeline you have to do some sidestepping of twitter to override their code a smidgen. Now we have a rolling timeline with our css to it, I.E. Larger font, proper line height and making the scrollbar hidden for heights larger than their limits.
var c = document.createElement('link');
setTimeout(frames[0].document.body.appendChild(c),500); // Mileage varies by connection. Bump 500 a bit higher if necessary
Just add this and all works well:
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
If the iframe comes from another server, you will have CORS ERRORS like:
Uncaught DOMException: Blocked a frame with origin "https://your-site.com" from accessing a cross-origin frame.
Only in the case you have control of both pages, you can use https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage to safely send messages like this:
On you main site(one that loads the iframe):
const iframe = document.querySelector('#frame-id');
iframe.contentWindow.postMessage(/*any variable or object here*/, 'https://iframe-site.example.com');
on the iframe site:
// Called sometime after postMessage is called
window.addEventListener("message", (event) => {
// Do we trust the sender of this message?
if (event.origin !== "http://your-main-site.com")
return;
...
...
});
Yes, it's possible although cumbersome. You would need to print/echo the HTML of the page into the body of your page then apply a CSS rule change function. Using the same examples given above, you would essentially be using a parsing method of finding the divs in the page, and then applying the CSS to it and then reprinting/echoing it out to the end user. I don't need this so I don't want to code that function into every item in the CSS of another webpage just to aphtply.
References:
Printing content of IFRAME
Accessing and printing HTML source code using PHP or JavaScript
http://www.w3schools.com/js/js_htmldom_html.asp
http://www.w3schools.com/js/js_htmldom_css.asp
Is it possible to make a link such that it brings up the REL of a topic,
for example if a link is
Click here
Is it possible to have a user link so when they go to the page it automatically opens the lightbox?
For example http://example.com/?rel=lightbox&src=picture.jpg
or something like that?
Yes, but no browsers include a lightbox, so you'd need to write or find code to make one of those as well.
Yes, it is possible. You may better use URLs like http://domain.com/#lightbox, and write a little script:
//jQuery sample
$(document).ready(function() {
if (location.hash == "#lightbox") {
//Just show your lightbox manually
}
});
you can do that with a bit of jQuery
$(a[rel=lightbox]).click(function(e) {
// open the lightbox with the link url inside
return false
});
How to make tabs on the web page so that when click is performed on the tab, the tab gets css changed, but on the click page is also reloaded and the css is back to original.
dont use the jquery :D
all of what you needs a container, a contained data in a varable and the tabs
the container is the victim of the css changes.
the tabs will trigger the changing process.
if you have a static content, you can write this into a string, and simply load it from thiss.
if you have a dinamically generated content, you need to create ajax request to get the fresh content, and then store it in the same string waiting for load.
with the tabs you sould create a general functionusable for content loading.
function load(data) {
document.getElementById("victim").innerHTML = data;
}
function changeCss(element) {
//redoing all changes
document.getElementById("tab1").style.background="#fff";
document.getElementById("tab2").style.background="#fff";
element.style.background = "#f0f";
}
with static content the triggers:
document.getElementById("tab1").onclick = function() {load("static data 1");changeCss(document.getElementById("tab1"))};
document.getElementById("tab2").onclick = function() {load("static data 2");changeCss(document.getElementById("tab2"))};
if you want to change the css, you need another function which do the changes.
i tell you dont use the jquery because you will not know what are you doing.
but thiss whole code can be replaced by jquery like this:
$("tab1").click(function(e) {
$("#tab1 | #tab2").each(function() {
$(this).css("background","#fff"); });
$(this).css("background","#00f");
$("#victim").append("static content 1");
});
$("tab12click(function(e) {
$("#tab1 | #tab2").each(function() {
$(this).css("background","#fff"); });
$(this).css("background","#00f");
$("#victim").append("static content 2");
});
if you know how javascript works then there is noting wrong with the jquery, but i see there is more and more people who just want to do their website very fast and simple, but not knowing what are they doing and running into the same problem again and again.
Jquery UI Tabs:
http://jqueryui.com/demos/tabs/
Have a <A href tag around the "tab" and use onClick to fire some Javascript that changes the CSS.
If you do not want use Jquery for creating of UI tabs, please see my cross-browser JavaScript code: GitHub.
You can use different ways to create tabs and tab content.
Tab content can added only when tab gets focus.
You can remember selected tab. Selected tab opens immediatelly after opening of the page.
You can create tabs inside tab.
Custom background of the tab is available.
Example: Tabs
I've got a web page that automatically reloads every few seconds and displays a different random image. When it reloads, however, there is a blank page for a second, then the image slowly loads. I'd like to continue to show the original page until the next page is loaded into the browser's memory and then display it all at once so that it looks like a seamless slideshow. Is there a way to do this?
is the only thing changing the image? if so it might be more efficient to use something like the cycle plugin for jQuery instead of reloading your whole page.
http://malsup.com/jquery/cycle/
Here is the JS needed if you used jQuery -
Say this was your HTML:
<div class="pics">
<img src="images/beach1.jpg" width="200" height="200" />
<img src="images/beach2.jpg" width="200" height="200" />
<img src="images/beach3.jpg" width="200" height="200" />
</div>
Here would be the needed jQuery:
$(function(){
$('div.pics').cycle();
});
no need to worry about different browsers- complete cross browser compatibility.
If you're just changing the image, then I'd suggest not reloading the page at all, and using some javascript to just change the image. This may be what the jquery cycle plugin does for you.
At any rate, here's a simple example
<img id="myImage" src="http://someserver/1.jpg" />
<script language="javascript">
var imageList = ["2.jpg", "3.jpg", "4.jpg"];
var listIndex = 0;
function changeImage(){
document.getElementById('myImage').src = imageList[listIndex++];
if(listIndex > imageList.length)
listIndex = 0; // cycle around again.
setTimeout(changeImage, 5000);
};
setTimeout(changeImage, 5000);
</script>
This changes the image source every 5 seconds. Unfortunately, the browser will download the image progressively, so you'll get a "flicker" (or maybe a white space) for a few seconds while the new image downloads.
To get around this, you can "preload" the image. This is done by creating a new temporary image which isn't displayed on the screen. Once that image loads, you set the real image to the same source as the "preload", so the browser will pull the image out of it's cache, and it will appear instantly. You'd do it like this:
<img id="myImage" src="http://someserver/1.jpg" />
<script language="javascript">
var imageList = ["2.jpg", "3.jpg", "4.jpg"];
var listIndex = 0;
var preloadImage = new Image();
// when the fake image finishes loading, change the real image
function changeImage(){
document.getElementById('myImage').src = preloadImage.src;
setTimeout(preChangeImage, 5000);
};
preloadImage.onload = changeImage;
function preChangeImage(){
// tell our fake image to change it's source
preloadImage.src = imageList[listIndex++];
if(listIndex > imageList.length)
listIndex = 0; // cycle around again.
};
setTimeout(preChangeImage, 5000);
</script>
That's quite complicated, but I'll leave it as an exercise to the reader to put all the pieces together (and hopefully say "AHA!") :-)
If you create two divs that overlap in the image area, you can load one with a new image via AJAX, hide the current div and display the one with the new image and you won't have a web page refresh to cause a the "bad transition". Then repeat the process.
If there's only a small number of images and they're always displayed in the same order, you can simply create an animated GIF.
Back in the dark old days (2002) I handled this kind of situation by having an invisible iframe. I'd load content into it and in the body.onload() method I would then put the content where it needed to go.
Pre-AJAX that was a pretty good solution.
I'm just mentioning this for completeness. I'm not recommending it but it's worth noting that Ajax is not a prerequisite.
That being said, in your case where you're simply cycling an image, use Ajax or something like the jQuery cycle plug-in to cycle through images dynamically without reloading the entire page.
I have a Joomla site which uses mod_rewrite to create pretty urls.
http://www.example.com/resources/newsletter
However this created a problem. Including images like this: src="images/pic.jpg", it would then look for a file at:
http://www.example.com/resources/newsletter/images/pic.jpg
...which obviously doesn't exist. To work around this, I included a <base> tag in my head section:
<base href="http://www.example.com/" />
...which worked fine, until I tried to do a link to an anchor point (bookmark) on the same page:
<!-- on http://www.example.com/resources/newsletter -->
go to the footer
<!-- clicking that link takes you to http://www.example.com/#footer -->
Changing my links to be <a href="resources/newsletter/#footer"> is not feasible, since I won't necessarily know the URL of the page when editing it. Is there any way to make some links ignore the <base> directive?
Though I'd really prefer a straight HTML solution, I'm using jQuery on this site already, so that could be an option if I'm stuck.
Is it possible to change your src attribute to be something like /images/pic.jpg? That'll achieve the effect you're looking for.
If that's not possible, this (untested) jQuery code should work for you:
$('a[#href^="#"]').click(function() {
var hash = this.hash, el = $(hash), offset;
if(!el.size()) {
el = $("[#name=" + hash.slice(1) + "]");
}
offset = el.offset();
window.scroll(offset.left, offset.top);
});
Old question, new answer..
Try this:
$('a[href^="#"]').on('click', function (event) {
event.preventDefault();
window.location.hash = $(this).attr('href');
});