Does the html tag noscript load the content in the background, even when javascript is enabled?
I have a random image that is called by JS each time the pageloads, but I would like all of the links (not just the current random one) to be crawled. At the same time, I don't want the pageload to slow down because images are loading in the background like they do with display:none. I also want to call these images and links in the html because of CMS reference issues with Javascript.
Image references in NOSCRIPT tags are not loaded at all when Javascript is enabled.
You can test this my making a number of large images, putting them inside the NOSCRIPT tag and watching browser activity.
Related
I am writing a preview function to let user preview the HTML file they uploaded and do some minor editing. The HTML file will contain no Javascript and no external CSS. All CSS are either inside style tag or inline. Images, on the other hand, will always be external as we don't provide space for storing images.
iFrame is not a good solution, because:
The preview is before actually saving the content, so I cannot provide an URL for iFrame to load the page.
It is difficult to touch the element inside iFrame. As the user will be doing minor update in another text box showing the plain HTML, I will need to update the elements inside frequently.
However, if I just insert content into an <div> the repeated <html>, <head> and <body>tag will crash the page.
So, is there a way I can preview the HTML without iFrame?
if you dont want to have the main app to affect the styling of the preview, you need to use iframe. have you see iframe's content window? https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/contentWindow. this might be the answer you are looking for. So basically here you try to access the DOM of your iframe. give it a try!
preview = getYourIframeDom();
code = getYourHtmlCodeHere();
preview.contentWindow.document.open("text/html","replace");
preview.contentWindow.document.write(code);
preview.contentWindow.document.close();
Is there source code (or a browser plugin) to convert the contents of an HTML 5 web page to an image file? This would not just include the visible contents, but the hidden contents as well (assuming there were scroll bars in the page). If there isn't, any advice on how to approach this particular functionality would be appreciated, and I can look into it.
I found this...
html to jpg with c#
However...
I think they just had text in the page, so it doesn't have any dynamic images on the page. My page specifically uses the HTML 5 canvas functionality to draw images. So that must be part of the image file.
It looks like you should be able to do it using javascript with this technique:
http://www.html5canvastutorials.com/advanced/html5-canvas-save-drawing-as-an-image/
Make sure to take note of the following caveat however:
Note: The toDataURL() method requires that any images drawn onto the canvas are hosted on a web server with the same domain as the code executing it. If this condition is not met, a SECURITY_ERR exception is thrown.
EDIT: You may also want to check out these related questions:
Save HTML5 canvas contents, including dragged-upon images
How to save a HTML5 Canvas as Image on a server
I have HTML content (mostly e-mails) that I would like to display in an archive. Seeing as some of these records contain their own styles, images, and headers, they need to be displayed independently and confined to its container so as not to interfere with the page displaying it. I immediately thought of an iframe.
I have two ways I can do this, both are somewhat indirect. 1) I can draw an iframe that points to about:blank and use Javascript to draw the content into the iframe after the page loads. 2) I can create a secondary PHP page that returns only the content of the e-mail and point the iframe to it as the src attribute. These solutions are simple enough, but I was wondering if there is a more direct way.
I found solutions like these, but they suggest using options 1 or 2 above. The point of this question is: "Is there a more direct way to preload HTML content directly into an iframe than to rely on Javascript or a secondary page?"
Html code as IFRAME source rather than a URL
Specifying content of an iframe instead of the src to a page
I am not sure how much more "direct" you can get than to specify a page in the src attribute of the iframe.
You already link to the only answer that actually works in your question that does not include using a src page or using EMCAScript to draw the iframe content. Remember thought that data urls are still limited in the number of bytes of data they can display in most browsers because there are limits to the length of the data url itself.
I would really suggest that you use the src attribute with a seperate backend script as that will decouple and increase the maintainability of your code as you can develop the scripts responsible for the page itself seperatly from those that show the iframe content.
I have a personal website, which I have made (to the best of my ability) without a template. I am not very experience in HTML so am not entirely sure if this is bad practice or not, but here is my issue.
My website consists of a frameset, which has 3 frames. Two do not change (banner and nav panel), and the other is content. The way I display my content in the main frame is through an iframe. Here's where the trouble comes. I have suggested my website to the crawler, and it crawls all the pages for content, of course. When I click on one of my links suggested by google (say, a project), the browser loads that individual .html file, without any of the rest of my frames. In other words, it does not link to the page through my index.html which sets up the formatting and page frames, but simply loads the html as a stand-alone page.
Is there a way I can avoid this, so that if a link for my website is clicked from an external link (not from my domain), the page first loads my index.html, and then the page of interest, so that it appears as if it were accessed normally from my index? I am not sure whether I should find a new way of displaying my content in the main frame so that it avoids iframes, or just need a simple script to redirect the user.
Not sure if it's useful but I've attached a photo of my page just to better explain what the frame layout is that I am working with.
Many thanks!!!
iFrames are definitely not the route to take when you are displaying consistent content... Which from what appears to be the Navigation, Header, and of course, the Content. Of course there will be an issue when a "Search Engine Spider" crawls your page... From my understanding, seeing as you are calling "content" from another page, the spider will crawl that page but will not crawl the index.html page we are currently viewing. When a "Spider" crawls a page it looks for STATIC HTML Tags/Content/Keywords/etc, and seeing as you are calling all of your content from other pages the "Spider" will treat that content as being on another page as well.
You want me recommendation? Avoid using an iFrame at all times. The point of an iFrame is to display content from another location (external), and or display static content on a page without having to scroll the current page you are viewing the iFrame on.
It is bad practice to use an iFrame, I would suggest using DIVs. Within these DIVs you may place content, images, links... Virtually anything you want, with all of the benefits of having people view your website, along with Search Engine Spiders.
I hope this helps!
Thanks,
Aaron
iFrames are a bad choice. AJAX is VERY simple these days. Just replace the big iFrame with a Div, and AJAX a page, putting the contents into that Div.
Replace your anchors with tags, and replace href with name, like so:
<div name='main.html' class='link' />
You need a div with the id 'loadHere':
Then include jQuery (it's pretty easy, google it) and at the end of your HTML put this:
$('.link').click(function(){
$.post(this.name,function(dat){
$('#loadHere').html(dat); }); });
I want to create a static Facebook page, which should include some images and text. Are there any restrictions to what I can use? Ideally I'd simply thrown in my HTML markup, with images , styles and fonts hosted on another domain and be done with it.
If it's just images and text there won't be any problem but be aware that Facebook saves to cache the styles if you use the <link> tag and you won't see the changes you make on it right away.