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.
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.
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!
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 am hoping someone has experience with this, but I am loading a window from a link on my main page. The window loads an ASPX page via the window’s loadmethod of iFrame. The aspx page has its own update panel on it and I was wondering how I can call the window’s “spinner” / process indicator while the page is processing. I have looked at the documentation on some online information about it but I am not sure how to implement it.
To show the spinner this is what I do:
function getMochaWindow(windowId) {
return MochaUI.Windows.instances.get(windowId);
}
function showLoading(winEl) {
getMochaWindow(winEl.id).showSpinner(winEl.getElement('.mochaSpinner'));
}
You need to call showLoading() passing the window element where you want it to appear.
Using the viewer control for display of SQL Reporting Services reports on web page (Microsoft.ReportViewer.WebForms), can you move the View Report button? It defaults to the very right side of the report, which means you have to scroll all the way across before the button is visible. Not a problem for reports that fit the window width, but on very wide reports that is quickly an issue.
No, you cannot reposition the view report button in the ReportViewer control.
However, you could create your own custom report viewing control. The control would be comprised of fields for report parameters and a button to generate the report. When a user clicks the button you could generate the report in the background. You could display the report as a PDF, HTML, etc.
It's kind of a hack, but you can move it in JavaScript. Just see what HTML the ReportViewer generates, and write the appropriate JavaScript code to move the button. I used JavaScript to hide the button (because we wanted our own View Report button). Any JavaScript code that manipulates the generated ReportViewer's HTML must come after the ReportViewer control in the .aspx page. Here's my code for hiding the button, to give you an idea of what you'd do:
function getRepViewBtn() {
return document.getElementsByName("ReportViewer1$ctl00$ctl00")[0];
}
function hideViewReportButton() { // call this where needed
var btn = getRepViewBtn();
btn.style.display = 'none';
}
The reason the button is pushed over to the right is that the td for the parameters has width="100%". I'm solving this problem with the following jquery. It simply changes the width of the parameters td to 1. Browsers will expand the width on their own to the width of the contents of the element. Hope this helps.
<script type="text/javascript">
$(document).ready(function() {
$("#<%= ReportViewer1.ClientID %> td:first").attr("width", "1");
});
</script>
Since I was searching for this answer just yesterday, I thought I'd post what I came up with to solve our problem. Our reports were coming back wide, and we wanted the "view reports" button to exist on the left side of the control so there was no need to scroll to get to the button. I did need to go into the source of the rendered file to find the ID names of the button and the target table.
I wrote a simple cut and paste javascript function to pull the button from its original position and essentially drop it into the next row in the containing table below the date pickers.
function moveButton() {
document.getElementById('ParameterTable_ctl00_MainContent_MyReports_ctl04').appendChild(document.getElementById('ctl00_MainContent_MyReports_ctl04_ctl00'));
}
This function gets called on the report viewer load event.
ScriptManager.RegisterStartupScript(Me, Me.GetType(), "moveButton", "moveButton();", True)
To adjust the position, I used the CSS ID.
#ctl00_MainContent_MyReports_ctl04_ctl00 {
margin: 0px 0px 0px 50px;
}
I had the same problem and ended up using an extension on Travis Collins answer; As well as changing the table column width I also align the "View Report" button left so that it appears neearer to rest of the controls.
<script type="text/javascript">
$(document).ready(function() {
$("#_ctl0_MainContent_reportViewer_fixedTable tr:first td:first-child").attr("width", "1");
$("#_ctl0_MainContent_reportViewer_fixedTable tr:first td:last-child").attr("align", "left");
});
</script>
You may need to tweak the JQuery selector depending on the element naming assigned to your existing control.