What would be the correct way to lazy load youtube video but keep focus on play / pause button like on the regular load (so people with disabilities can use space key to pause the video)?
All solution are seem not to keep focus on video and space scrolls the page down.
Is that possible at all?
This might not be the best way to do it as JavaScript will need to be enabled in you client's browser, however you should be able to run a JavaScript function when the iFrame loads like this:
const iframe = document.querySelector('.my-iframe');
iframe.onload = function() {
onLoad();
}
or like this:
<iframe src="https://logrocket.com/" onload="onLoad()" onerror="onError()"></iframe>
If you would then write a function called onLoad() that calls the .focus() method on the play button with code similar to that in the next block, you should be able to have focus set to the play button. Note that the following code block assumes that the ID of the play button will be "play_button" which is unlikely to be the case.
funtion onLoad() {
iframe.contentWindow.document.getElementById("play_button").focus();
};
Hope this helps!
Related
I cannot seem to get Chrome to pop up an "alert" page. The alert page has code in it, so it can't really be a DIV or I would just do it that way. It worked for many years, but likely do to a Chrome update it will no longer function. Still works fine in IE11, though.
The following code is used to pop up an "alert" page when there is an alert that is queried from a Database. It has always worked until recently (15 years and running)
CODE:
ClientScript.RegisterStartupScript(GetType(Page), "Alarm", "<script language='javascript'>window.showModalDialog('Alarm.aspx?ID=" & AlarmID & "', null, 'dialogWidth=460px;dialogHeight=310px;status=no;resizable=yes');document.frmA.submit();</script>")
I've tried a few things like windows.open and creating a hidden button on the asp.net page and then using the click event. Nothing works. I do not see a blocked popup in Chrome and I have even went into settings and did the following:
Set Safe Browsing to "No Protection"
Set allow pop-ups and redirects on the server name (http://servername and http://localhost)
As noted, near all browsers quite much have clamped down on popup windows. this makes things more difficult for web developers.
There are two good approaches. one I don't fancy at all is using bootstrap dialogs, but they tend to "sort of work all on their own" kind of deal based on class settings for divs etc. - really hard to debug.
Since near all sites these days include jQuery for your js code, then I quite much hands down recommend you introduce jquery.UI. It has a whole slew of nice things such as date pickers etc. But it also has a rather nice dialog pop option. They just work, and when you code them up? They follow "normal" like code approaches.
it not quite clear if your message/dialog pops after say a button click (and post back), and the at the end of that process, you need/want some dialog message to display. But all in all, I would high recommend jQuery.UI for this dialog/message that you need.
jQuery.UI in most cases expects the content you want to "display/pop" exists in a simple div in the current existing page. However, it also works VERY well if you supply the dialog another existing web page. The only REAL big issue to keep in mind? That dialog page you pop cannot handle multiple post-backs. (so, some buttons, or ONE post back in that dialog is fine - but you ONLY get the ONE post-back.
So, if that page display allows some input, or some interaction and ONLY requires ONE post-back, then jQuery.UI is again great. If that pop page requires several buttons and several post-backs, then you are in for a world of pain and hurt - jQuery.UI dialogs (like most) cannot survive or handle multiple postbacks. Any post-back means the dialog closes (collapses). So in those cases, you have to adopt ajax calls (web methods) if you need/have/want that page to have more then one active post-back button or event.
So, you could have/place a script in even your master page, and little function code stub that your register script can call.
Or, I suppose you could inject the whole script, but the script would look like this:
So, the pop page actualy is SHOVED into a div. So we have a div that "holds" the page.
The jQuery.UI code script then looks like this:
<div id="poppagearea">
</div>
<script>
function showpage() {
var mydiv = $('#poppagearea');
mydiv.dialog({
autoOpen: false, modal: true, title: 'My cool other page', width: '30%',
position: { my: 'top', at: 'top+150' },
buttons: {
'ok': function () {
mydiv.dialog('close');
alert('user click ok');
},
'cancel': function () {
mydiv.dialog('close');
alert('user click cancel');
}
}
});
mydiv.load('Default.aspx');
// Open the dialog
mydiv.dialog('open');
}
So, in above, we loaded "default.aspx" into that dialog and thus displayed it on the page.
So, I would consider jQuery.UI - but it does mean adopting a new js library into your existing project.
The pop page does gray out the full page, and you do get a title bar, and your own ok, cancel button. The above thus looks like this:
So, it does a great job - but as noted, that page can only have one post-back, and it can't be a general working aspx page with lots of buttons and post backs - but it will render and display rather well.
So I would like to be able to have a print button for entries in our database so users can print an entry via a print friendly "form".
My thought was to create a separate page, add labels and have those labels pull the relevant information.
I know I can add the open widget information via this code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showPage(app.pages.TestPrint);
But I'm running into a few problems:
I can't get the page to open in a new window. Is this possible?
window.open(app.pages.TestPrint);
Just gives me a blank page. Does the browser lose the widget source once the new window opens?
I can't get the print option (either onClick or onDataLoad) to print JUST the image (or widget). I run
window.print();
And it includes headers + scroll bars. Do I need to be running a client side script instead?
Any help would be appreciated. Thank you!
To get exactly what you'd want you'd have to do a lot of work.
Here is my suggested, simpler answer:
Don't open up a new tab. If you use showPage like you mention, and provide a "back" button on the page to go back to where you were, you'll get pretty much everything you need. If you don't want the back to show up when you print, then you can setVisibility(false) on the button before you print, then print, then setVisibility(true).
I'll give a quick summary of how you could do this with a new tab, but it's pretty involved so I can't go into details without trying it myself. The basic idea, is you want to open the page with a full URL, just like a user was navigating to it.
You can use #TestPrint to indicate which page you want to load. You also need the URL of your application, which as far as I can remember is only available in a server-side script using the Apps Script method: ScriptApp.getService().getUrl(). On top of this, you'll probably need to pass in the key so that your page knows what data to load.
So given this, you need to assemble a url by calling a server script, then appending the key property to it. In the end you want a url something like:
https://www.script.google.com/yourappaddress#TestPage?key=keyOfYourModel.
Then on TestPage you need to read the key, and load data for that key. (You can read the key using google.script.url).
Alternatively, I think there are some tricks you can play by opening a blank window and then writing directly to its DOM, but I've never tried that, and since Apps Script runs inside an iframe I'm not sure if it's possible. If I get a chance I'll play with it and update this answer, but for your own reference you could look here: create html page and print to new tab in javascript
I'm imagining something like that, except that your page an write it's html content. Something like:
var winPrint = window.open('', '_blank', 'left=0,top=0,width=800,height=600,toolbar=0,scrollbars=0,status=0');
winPrint.document.write(app.pages.TestPage.getElement().innerHTML);
winPrint.document.close();
winPrint.focus();
winPrint.print();
winPrint.close();
Hope one of those three options helps :)
So here is what I ended up doing. It isn't elegant, but it works.
I added a Print Button to a Page Fragment that pops up when a user edits a database entry.
Database Edit Button code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showDialog(app.pageFragments.FragmentName);
That Print Button goes to a different (full) Page and closes the Fragment.
Print Button Code:
app.datasources.ModelName.selectKey(widget.datasource.item._key);
app.showPage(app.pages.ModelName_Print);
app.closeDialog();
I made sure to make the new Print Page was small enough so that Chrome fits it properly into a 8.5 x 11" page (728x975).
I then created a Panel that fills the page and populated the page with Labels
#datasource.item.FieldName
I then put the following into the onDataLoad for the Panel
window.print();
So now when the user presses the Print Button in the Fragment they are taken to this new page and after the data loads they automatically get a print dialog.
The only downside is that after printing the user has to use a back button I added to return to the database page.
1.
As far as I know, you cannot combine window.open with app.pages.*, because
window.open would require url parameter at least, while app.pages.* is essentially an internal routing mechanism provided by App Maker, and it returns page object back, suitable for for switching between pages, or opening dialogs.
2.
You would probably need to style your page first, so like it includes things you would like to have printed out. To do so please use #media print
ex: We have a button on the page and would like to hide it from print page
#media print {
.app-NewPage-Button1 {
display : none;
}
}
Hope it helps.
1. Here is how it is done, in a pop up window, without messing up the current page (client script):
function print(widget, title){
var content=widget.getElement().innerHTML;
var win = window.open('', 'printWindow', 'height=600,width=800');
win.document.write('<head><title>'+title+'/title></head>');
win.document.write('<body>'+content+'</body>');
win.document.close();
win.focus();
win.print();
win.close();
}
and the onclick handler for the button is:
print(widget.root.descendants.PageFragment1, 'test');
In this example, PageFragment1 is a page fragment on the current page, hidden by adding a style with namehidden with definition .hidden{display:none;} (this is different than visible which in App Maker seems to remove the item from the DOM). Works perfectly...
2. You cannot open pages from the app in another tab. In principle something like this would do it:
var w=window.parent.parent;
w.open(w.location.protocol+'//'+w.location.host+w.location.pathname+'#PrintPage', '_blank');
But since the app is running in frame nested two deep from the launching page, and with a different origin, you will not be able to access the url that you need (the above code results in a cross origin frame access error). So you would have to hard code the URL, which changes at deployment, so it gets ugly very fast. Not that you want to anyway, the load time of an app should discourage you from wanting to do that anyway.
On this page I am making I have a button at the bottom of the page, which has to get wider and then move up when clicked. After the button has reached its new place, new content should load.
I have found a lot about CSS transitions an animations on hover, but I want to use this as a page transition.
How do I get this transition to happen before loading the new page??
I would love to do this with as little JS as possible..
Thanx Y'all!
Based on what you asked:
This delays the page load until the transition is complete (the setTimeout just need to be set to whatever the duration of the CSS transition is).
$('.link').click(function () {
$(this).addClass('clicked');
setTimeout( function() {
window.location.href = "url for page goes here";
}, 500);//set 500 to whatever timeout you want
});
See pen example: (http://cdpn.io/vyuch)
BUT
This is not a good idea... If CSS transitions aren't available, it will just look like a terrible link and confuse users. If they are, it is still slow and frustrating.
If you want the content to load on the same page, you need to use AJAX. To help with this, some more information would be helpful...
I would like to open a document after my ASP.NET page loads in a separate window. I would like to do this with the document not attempt to be blocked by a pop-up blocked. I tried and I am getting the prompt to ask if I would like to allow the popup. Is the best way to do this using a timer control or is there a better way in the lifecylce?
I have tried several events, but they are all launching the document prior to page load.
Fundamentally what you're trying to do is exactly the thing that pop-up blockers are designed to prevent - load a pop-up window without an explicit user interaction. There may be various tricks you could use to get around certain particular pop-up blockers, but you'll never be able to solve this in the general case.
The best solution is to have a link on your page to open the document in question in a new window. Pop-up blockers do not prevent links targeted to a new window.
I use
function openpage(page) {
if (document.getElementById('hf_open').value == 1) {
openChild(page, 'nueva');
document.getElementById('hf_open').value = 0;
}
}
and in the body onload ="openpage('whateverpage.aspx');"
and in an ASP.NET event I set if I want the popup to be open or not a particular time by setting hf_open to 1 if the pop up has to be opened at that time.
In Internet Explorer 7 with pop up blocker: turn on checked - it works.
How are users getting to your page? You could place the popup JavaScript in the link that takes users to your page.
You could use the onload JavaScript event.
function open_page()
{
popupWin = window.open('windowURL','windowName', ' resizable,dependent,status,width=500,height=400,left=0,top=0')
}
Then have the following body tag
<body onload="open_page()">
However, this won't get around your popup blocking issue.
I'm building a photo gallery in ASP.NET. The user can browse thumbnails along the left and select one, which brings a preview-sized version into the right pane of the page.
I'd like to fade between the images, so that the current one fades out and the next one fades in. I'm using jQuery to fade the preview image in after it is loaded, which works great. Unfortunately, I can't get the fadeOut script to run before the click event posts the page back to the server. The thumbnails are ASP.NET ImageButtons, which means they're <input> tags.
Is there a way to get the postback to delay just long enough for the image to fade out? I've seen some tricks with the form onSubmit and setTimeout() but that would affect all the links and buttons on the page. I want to delay postback for the thumbnails only.
TIA
EDIT: Based on my research, and trying the suggestions below, it may be possible to delay the postback to accomplish this but it's not the best approach on several levels. To get a clean fade transition between images, in the future I would not do any posting back at all. I would use jQuery exclusively for the fadeout, load, fadein.
Try adding a return false to your function that handles the fadein/out... It should prevent the page postback from occurring...
$('#<%= this.aspbutton.ClientId%>').click(function(){
$('#myDiv').fadeout("slow");
return false;
});
I'm not sure what you are getting on the PostBack where you would want to fade out an image and then fade one in. Have you considered using AJAX for that? You could even have the thumbnail image contain the necessary information within the image tags for the larger image.
Take a look at the jQuery Lightbox plugin. I have implemented this plugin and modified the .JS a bit to allow for viewing a higher resolution photo in addition to the web view. Check it out here.
$('#<%= this.aspbutton.ClientId%>').click(function(){
var $btn = $(this);
$('#myDiv').fadeout("slow", function() {
$btn.unbind('click').click();
});
return false;
});
Here's the solution I used:
Since I AM using MS AJAX with an UpdatePanel, I can use the client-side AJAX event handler.
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(fadeOut);
function fadeOut() {
if ($('.mainImage').length > 0) {
$('.mainImage').fadeOut('normal');
}
}
This gives me the exact behavior I wanted- any time the user navigates between thumbnails, the image fades out, loads, then the new one fades in.
HOWEVER...
This is still not ideal, as there is a pause between fades while the page posts back. It will work for now but in the long run it would be better to use jQuery to set the preview image rather than the thumbnails posting back as ImageButtons.