I want to design a layout with images in header. I try to put in layout.tml a division with html component "img" but the atribute "src" depends on the page where you are. How can I solutionate this?
Using CSS is a great option; the other is to let Tapestry generate the proper image URLs for you:
<img src="context:images/image.png" alt="Logo"/>
In this case img is not a component, but is a dynamic element; the src attribute is bound to context:images/image.png1, which resolves to the proper Tapestry URL to the image; in fact, the URL will be longer than you expect, as it will include (in Tapestry 5.4) a hash code based on the content, and processing will include E-Tag support and a far-future expires header.
You could make the header blank and use Internal css to make the background of the header change
for example, you create the header block
<div class="headerBG"></div>
and then in each page 1 include
<styles>
.headerBG {
background-image: page1Header.png;
}
</styles>
in page 2
<styles>
.headerBG {
background-image: page2Header.png;
}
</styles>
and so on
The other way would be with javascript
<script>
currPage = location.pathname.substring(1);
if (currPage == index.html) {
document.getElementByID("imageid").src="image1.png";
}
</script>
Related
Same-page links work by referencing another element that has id="sec-id" on the same page, using
for instance. A link like this is relative.
However, if I use that very same syntax in the iframe in my LaTeX.js playground, it will not just scroll to the destination element, but (re)load the whole playground page inside the ifame. (Note that I set the contents of the iframe programmatically with iframe.srcdoc = html)
Example: LaTeX.js playground, right at the end of the first section click on the link in "See also Section 11." in the iframe on the right side.
What could be the reason?
UPDATE: I now understand the source of the problem: the browser uses the document's base URL to make all relative URLs absolute (see <base>). The trouble starts with an iframe that has its content set with srcdoc: no unique base URL is specified, and in that case the base URL of the parent frame/document is used--the playground in my case (see the HTML Standard).
Therefore, the question becomes: is there a way to reference the srcdoc iframe in a base URL? or is it possible to make the browser not prepend the base? or to make a base URL that doesn't change the relative #sec-id URLs?
I don't know exactly how you could resolve this, I think it is because the srcdoc, you can't use the src with the content-type because the character limit, but you can convert it to a Blob and it kinda works, the style are lost though. Maybe you can use it as a starting point, based on your page:
// Get the document content
const doc = document.querySelector('iframe').srcdoc;
// Convert it to blob
const blob = new Blob([doc], {type : 'text/html'});
// Load the blob on the src attr
document.querySelector('iframe').src = URL.createObjectURL(blob);
// Remove srcdoc to allow src
document.querySelector('iframe').removeAttribute('srcdoc');
What about catching the event and scrolling to the desired anchor?
$("a").click(function(e) {
$('.iframe').animate({
scrollTop: $(e.target.attr('href')).offset().top
}, 2000);
return false;
});
For the record, it seems that my question is not possible, i.e., it is not possible to use relative same-page links in an iframe that has its content set using srcdoc. A workaround has to be used, see the other answer.
How can I control the background image and colour of a body element within an iframe? Note, the embedded body element has a class, and the iframe is of a page that is part of my site.
The reason I need this is that my site has a black background assigned to the body, and then a white background assigned to divs that contain text. A WYSIWYG editor uses an iframe to embed content when editing, but it doesn't include the div, so the text is very hard to read.
The body of the iframe when in the editor has a class that isn't used anywhere else, so I'm assuming this was put there so problems like this could be solved. However, when I apply styles to class.body they don't override the styles applied to body. The weird thing is that the styles do appear in Firebug, so I've no idea what's going on!
Thanks
UPDATE - I've tried #mikeq's solution of adding a style to the class that is the body's class. This doesn't work when added to the main page's stylesheet, but it does work when added with Firebug. I'm assuming this is because Firebug is applied to all elements on the page whereas the CSS is not applied within iframes. Does this mean that adding the css after window load with JavaScript would work?
The below only works if the iframe content is from the same parent domain.
The following code works for me. Tested on Chrome and IE8. The inner iframe references a page that is on the same domain as the parent page.
In this particular case, I am hiding an element with a specific class in the inner iframe.
Basically, you just append a style element to the head section of the document loaded in a frame:
frame.addEventListener("load", ev => {
const new_style_element = document.createElement("style");
new_style_element.textContent = ".my-class { display: none; }"
ev.target.contentDocument.head.appendChild(new_style_element);
});
You can also instead of style use a link element, for referencing a stylesheet resource.
An iframe is a 'hole' in your page that displays another web page inside of it. The contents of the iframe is not in any shape or form part of your parent page.
As others have stated, your options are:
give the file that is being loaded in the iframe the necessary CSS
if the file in the iframe is from the same domain as your parent, then you can access the DOM of the document in the iframe from the parent.
You cannot change the style of a page displayed in an iframe unless you have direct access and therefore ownership of the source html and/or css files.
This is to stop XSS (Cross Site Scripting)
This code uses vanilla JavaScript. It creates a new <style> element. It sets the text content of that element to be a string containing the new CSS. And it appends that element directly to the iframe document's head.
Keep in mind, however, that accessing elements of a document loaded from another origin is not permitted (for security reasons) -- contentDocument of the iframe element will evaluate to null when attempted from the browsing context of the page embedding the frame.
var iframe = document.getElementById('the-iframe');
var style = document.createElement('style');
style.textContent =
'body {' +
' background-color: some-color;' +
' background-image: some-image;' +
'}'
;
iframe.contentDocument.head.appendChild(style);
Override another domain iframe CSS
By using part of SimpleSam5's answer, I achieved this with a few of Tawk's chat iframes (their customization interface is fine but I needed further customizations).
In this particular iframe that shows up on mobile devices, I needed to hide the default icon and place one of my background images. I did the following:
Tawk_API.onLoad = function() {
// without a specific API, you may try a similar load function
// perhaps with a setTimeout to ensure the iframe's content is fully loaded
$('#mtawkchat-minified-iframe-element').
contents().find("head").append(
$("<style type='text/css'>"+
"#tawkchat-status-text-container {"+
"background: url(https://example.net/img/my_mobile_bg.png) no-repeat center center blue;"+
"background-size: 100%;"+
"} "+
"#tawkchat-status-icon {display:none} </style>")
);
};
I do not own any Tawk's domain and this worked for me, thus you may do this even if it's not from the same parent domain (despite Jeremy Becker's comment on Sam's answer).
An iframe has another scope, so you can't access it to style or to change its content with javascript.
It's basically "another page".
The only thing you can do is to edit its own CSS, because with your global CSS you can't do anything.
This should work with cross domain if you're the owner of the both
The trick here is to assign a global css variable to your body, to listen message with the new color, and then to change the global css variable once receive a message.
I'm using angular, but it should work with pure javascript
My use case was to show to the user what he how the color change would impact his website in the iframe before saving it
Domain A
#ViewChildren('iframeContainer') iframeContainer: QueryList<ElementRef>
sendDataToIframe(
data = {
type: 'colorChange',
colors: {primary: '#000', secondary: '#fff'},
},
): void {
if (this.targetUrl)
this.iframeContainer.first.nativeElement.contentWindow.postMessage(data) // You may use document.getElementById('iframeContainer') instead
}
Domain B
acceptedEditOrigins = [
'https://my.origine.ccom', // Be sur to have a correct origin, to avoid xss injecto: https://en.wikipedia.org/wiki/Cross-site_scripting
]
constructor() {
// Listen to message
window.addEventListener('message', (event) => this.receiveMessage(event), false)
}
receiveMessage(event: MessageEvent) {
if (this.acceptedEditOrigins.includes(event.origin))
switch (event.data.type) {
case 'colorChange': {
this.setWebsiteConfigColor(event.data.colors)
}
}
}
setWebsiteConfigColor(colors: WebsiteConfigColors) {
if (colors) {
const root = document.documentElement
for (const [key, value] of Object.entries(colors)) {
root.style.setProperty(`--${key}`, value) // --primary: #000, --secondary: #fff
}
}
}
body {
background-color: var(--primary);
}
If you have control of the page hosting the iframe and the page of the iframe, you can pass a query parameter to the iframe...
Here's an example to add a class to the iframe based on whether or not the hosting site is mobile...
Adding iFrame:
var isMobile=$("mobile").length; //detect if page is mobile
var iFrameUrl ="https://myiframesite/?isMobile=" + isMobile;
$(body).append("<div id='wrapper'><iframe src=''></iframe></div>");
$("#wrapper iframe").attr("src", iFrameUrl );
Inside iFrame:
//add mobile class if needed
var url = new URL(window.location.href);
var isMobile = url.searchParams.get("isMobile");
if(isMobile == "1") {
$("body").addClass("mobile");
}
For juste one iframe, you can do something like this:
document.querySelector('iframe').contentDocument.body.style.backgroundColor = '#1e1e2d';
In case you have multiple iframe you're dealing with:
document.querySelectorAll('iframe').forEach((iframe) => {
iframe.contentDocument.body.style.backgroundColor = '#1e1e2d';
});
Perhaps it's changed now, but I have used a separate stylesheet with this element:
.feedEkList iframe
{
max-width: 435px!important;
width: 435px!important;
height: 320px!important;
}
to successfully style embedded youtube iframes...see the blog posts on this page.
give the body of your iframe page an ID (or class if you wish)
<html>
<head></head>
<body id="myId">
</body>
</html>
then, also within the iframe's page, assign a background to that in CSS
#myId {
background-color: white;
}
I am working on a personal site, and the site uses an <iframe> to display most of its contents. You navigate the site by changing the target of the <iframe> to a specific .html.
Here's an example of how the navigation works:
<ul>
<li><a>onclick="document.getElementById('iframe1').src='home.html'>Home</a></li>
<li><a>onclick="document.getElementById('iframe1').src='prjcts.html'>Projects</a></li>
</ul>
<iframe src="home.html" id="iframe1"></iframe>
The problem that I've encountered is that since most things are is inside of the <iframe> that I can't link directly to any specific content.
If I wanted to show someone the Projects page, I can only link "www.example.com/" and tell them to navigate there themselves, and not simply link "www.example.com/projects".
My theory is that you can do it with something like:
"www.example.com#projects" using ID's or something, but since I'm pretty new to HTML5, I might be completely wrong. I have no idea how to make it work, and I can't seem to find anyone explaining it.
Is there any way to use the URL to specify an <iframe> target, and if so, how?
You would want to check the url and then set the src of your iframe using the url:
This is just an example of how you could do it, you should use maybe an array of URLs. There are a bunch of ways to accomplish this.
HTML:
<div id="wrapper">
<iframe id="myIframe" src="http://example.com/"></iframe>
</div>
JavaScript (using jQuery here):
$(document).ready(function () {
var myPath = window.location.pathname; // returns something like /projects.html
if (myPath == "/projects.html") {
$('#myIframe').src = "http://www.example.com/projects.html"; // sets the src of your iframe
}
});
Refer to this post's answer: dynamically set iframe src
How can I control the background image and colour of a body element within an iframe? Note, the embedded body element has a class, and the iframe is of a page that is part of my site.
The reason I need this is that my site has a black background assigned to the body, and then a white background assigned to divs that contain text. A WYSIWYG editor uses an iframe to embed content when editing, but it doesn't include the div, so the text is very hard to read.
The body of the iframe when in the editor has a class that isn't used anywhere else, so I'm assuming this was put there so problems like this could be solved. However, when I apply styles to class.body they don't override the styles applied to body. The weird thing is that the styles do appear in Firebug, so I've no idea what's going on!
Thanks
UPDATE - I've tried #mikeq's solution of adding a style to the class that is the body's class. This doesn't work when added to the main page's stylesheet, but it does work when added with Firebug. I'm assuming this is because Firebug is applied to all elements on the page whereas the CSS is not applied within iframes. Does this mean that adding the css after window load with JavaScript would work?
The below only works if the iframe content is from the same parent domain.
The following code works for me. Tested on Chrome and IE8. The inner iframe references a page that is on the same domain as the parent page.
In this particular case, I am hiding an element with a specific class in the inner iframe.
Basically, you just append a style element to the head section of the document loaded in a frame:
frame.addEventListener("load", ev => {
const new_style_element = document.createElement("style");
new_style_element.textContent = ".my-class { display: none; }"
ev.target.contentDocument.head.appendChild(new_style_element);
});
You can also instead of style use a link element, for referencing a stylesheet resource.
An iframe is a 'hole' in your page that displays another web page inside of it. The contents of the iframe is not in any shape or form part of your parent page.
As others have stated, your options are:
give the file that is being loaded in the iframe the necessary CSS
if the file in the iframe is from the same domain as your parent, then you can access the DOM of the document in the iframe from the parent.
You cannot change the style of a page displayed in an iframe unless you have direct access and therefore ownership of the source html and/or css files.
This is to stop XSS (Cross Site Scripting)
This code uses vanilla JavaScript. It creates a new <style> element. It sets the text content of that element to be a string containing the new CSS. And it appends that element directly to the iframe document's head.
Keep in mind, however, that accessing elements of a document loaded from another origin is not permitted (for security reasons) -- contentDocument of the iframe element will evaluate to null when attempted from the browsing context of the page embedding the frame.
var iframe = document.getElementById('the-iframe');
var style = document.createElement('style');
style.textContent =
'body {' +
' background-color: some-color;' +
' background-image: some-image;' +
'}'
;
iframe.contentDocument.head.appendChild(style);
Override another domain iframe CSS
By using part of SimpleSam5's answer, I achieved this with a few of Tawk's chat iframes (their customization interface is fine but I needed further customizations).
In this particular iframe that shows up on mobile devices, I needed to hide the default icon and place one of my background images. I did the following:
Tawk_API.onLoad = function() {
// without a specific API, you may try a similar load function
// perhaps with a setTimeout to ensure the iframe's content is fully loaded
$('#mtawkchat-minified-iframe-element').
contents().find("head").append(
$("<style type='text/css'>"+
"#tawkchat-status-text-container {"+
"background: url(https://example.net/img/my_mobile_bg.png) no-repeat center center blue;"+
"background-size: 100%;"+
"} "+
"#tawkchat-status-icon {display:none} </style>")
);
};
I do not own any Tawk's domain and this worked for me, thus you may do this even if it's not from the same parent domain (despite Jeremy Becker's comment on Sam's answer).
An iframe has another scope, so you can't access it to style or to change its content with javascript.
It's basically "another page".
The only thing you can do is to edit its own CSS, because with your global CSS you can't do anything.
This should work with cross domain if you're the owner of the both
The trick here is to assign a global css variable to your body, to listen message with the new color, and then to change the global css variable once receive a message.
I'm using angular, but it should work with pure javascript
My use case was to show to the user what he how the color change would impact his website in the iframe before saving it
Domain A
#ViewChildren('iframeContainer') iframeContainer: QueryList<ElementRef>
sendDataToIframe(
data = {
type: 'colorChange',
colors: {primary: '#000', secondary: '#fff'},
},
): void {
if (this.targetUrl)
this.iframeContainer.first.nativeElement.contentWindow.postMessage(data) // You may use document.getElementById('iframeContainer') instead
}
Domain B
acceptedEditOrigins = [
'https://my.origine.ccom', // Be sur to have a correct origin, to avoid xss injecto: https://en.wikipedia.org/wiki/Cross-site_scripting
]
constructor() {
// Listen to message
window.addEventListener('message', (event) => this.receiveMessage(event), false)
}
receiveMessage(event: MessageEvent) {
if (this.acceptedEditOrigins.includes(event.origin))
switch (event.data.type) {
case 'colorChange': {
this.setWebsiteConfigColor(event.data.colors)
}
}
}
setWebsiteConfigColor(colors: WebsiteConfigColors) {
if (colors) {
const root = document.documentElement
for (const [key, value] of Object.entries(colors)) {
root.style.setProperty(`--${key}`, value) // --primary: #000, --secondary: #fff
}
}
}
body {
background-color: var(--primary);
}
If you have control of the page hosting the iframe and the page of the iframe, you can pass a query parameter to the iframe...
Here's an example to add a class to the iframe based on whether or not the hosting site is mobile...
Adding iFrame:
var isMobile=$("mobile").length; //detect if page is mobile
var iFrameUrl ="https://myiframesite/?isMobile=" + isMobile;
$(body).append("<div id='wrapper'><iframe src=''></iframe></div>");
$("#wrapper iframe").attr("src", iFrameUrl );
Inside iFrame:
//add mobile class if needed
var url = new URL(window.location.href);
var isMobile = url.searchParams.get("isMobile");
if(isMobile == "1") {
$("body").addClass("mobile");
}
For juste one iframe, you can do something like this:
document.querySelector('iframe').contentDocument.body.style.backgroundColor = '#1e1e2d';
In case you have multiple iframe you're dealing with:
document.querySelectorAll('iframe').forEach((iframe) => {
iframe.contentDocument.body.style.backgroundColor = '#1e1e2d';
});
Perhaps it's changed now, but I have used a separate stylesheet with this element:
.feedEkList iframe
{
max-width: 435px!important;
width: 435px!important;
height: 320px!important;
}
to successfully style embedded youtube iframes...see the blog posts on this page.
give the body of your iframe page an ID (or class if you wish)
<html>
<head></head>
<body id="myId">
</body>
</html>
then, also within the iframe's page, assign a background to that in CSS
#myId {
background-color: white;
}
I have two classic HTML pages (just HTML and CSS) and links between them.
When I click on these links, the screen flickers (it quickly goes white between transitions).
I tried to place this in the head - without result:
<meta http-equiv="Page-Enter" content="blendTrans(Duration=0.0)" />
<meta http-equiv="Page-Exit" content="blendTrans(Duration=0.0)" />
I can usually open other sites without the flickering.
Browser is Firefox 16.0.1.
Just change your body background to:
body {
background: url("Images/sky01.jpg") repeat scroll 0 0 #121210;
font-family: Verdana,Geneva,sans-serif;
font-size: 12px;
margin: 0;
padding: 0;
}
background color will prevent white flickering while loading the background image.
That meta are for IE only, they don't work in FF.
You can't rely prevent flickering in plain HTML. The best solution I found is to replace every link with a JavaScript call where you download the page with AJAX and then you replace the document itself with the new content. Page refresh will be really fast and you won't see any blank screen while downloading.
Basic function may be something like this:
function followLink(pageUrl)
{
jQuery.ajax({
url: pageUrl,
type: "GET",
dataType: 'html',
success: function(response){
document.getElementsByTagName('html')[0].innerHTML = response
}
});
}
Then you have to replace you links from:
Link
With:
Link
More details about this: replace entire HTML document]1: how to replace the content of an HTML document using jQuery and its implications (not always so obvious).
Improvements
With this solution you force your users to use JavaScript, in case it's not enable they won't be able to click links. For this reason I would provide a fallback. First do not change <a> but decorate them with (for example) a CSS class like async-load. Now on the onload of the page replace all hrefs with their javascript: counterpart, something like this:
jQuery().ready(function() {
jQuery("a.asynch-load").each(function() {
this.href = "javascript:followLink(\"" + this.href + "\")";
});
});
With this you can handle a loading animation too (how it's implemented depends on what yuo're using and your layout). Moreover in the same place you can provide fade in/out animations.
Finally do not forget that this technique can be used for fragments too (for example if you provide a shared navigation bar and a content sections replaced when user click on a link the the navigation bar (so you won't need to load everything again).
Try to embed pictures as it delays final page loading and therefore white transition time
echo '<img src="data:image/png;base64,';
echo base64_encode(file_get_contents($file));
echo '"/>';