When the user clicks on a link to a subpage, I want to store data in sessionStorage from the current page before leaving to the next page. Then when this new page has loaded, I want to apply the sessionStorage data on this page.
What complicates things is that the link is part a collapsing menu system. Which means that this system needs to update (which is also done on click) before the page data is stored.
So essentially, the wanted execution order:
User clicks link
Menu system is updated
Page data is stored
Browser loads the new page
Page data from the previous page loads and applies on the new page
My issue is the order in which everything is executed. I don't understand when the user clicks on the link how to control the order of when the actions are executed.
Thankful for help
i am using ActiveAdmin to show admin graphs to the users. I have a show page with tabs, For each tab i show some graphs, but actually since the show method is called when the user requests the page, all the queries to build all the graphs are called, even if the user is seeing only the first tab. The queries are heavy, so the loading time of that page is large.
Is it possible to launch the queries and execute the related code when the user click on the single tab?
I have an MVC application I'm hosting on AppHarbor that takes 20 seconds or so to start up. Since I can't control the timeout period on AppHarbor, any user that visits the application gets a blank screen while resources spool up.
I'd like to at least show the user something other than a blank page while resources are being loaded.
I've tried adding an index.html page with a redirect, but I only want that page to appear when the application first fires up.
Try this link, it's not the one I currently use (couldn't find it online), but it seems easy enough to use.
Since you have a very long load at the start, you can use this:
//hide after page load completed
$(document).ready(function () {
$('.loader').css("display", "none");
});
Other then that just follow their explanation there, if you have any questions about it, I'll try and help more.
I'm trying to figure out exactly what happens when you link to a same-domain external page with JQM. I know the new page gets added to the DOM, but if I cruise through 5 or so of these links, are all 5 now in the DOM?
Firebug is showing the initial page and the active page in the DOM and nothing else.
Chrome is showing variable results, usually storing the last page and the active page.
What exactly happens here?
Do I need to assume all my handlers on a page are lost when I change page? So I need to rebind them on each pageinit?
Easy way to check. Bind page create:
$('#pageID').live('pagecreate', function (event) { alert("Inserted to the dom") };
That triggers when the page is inserted to the dom. If the alert is triggered every time you enter the page, it means the page is not saved to the dom. And I think that is actually the case. But I am not sure.
I'm making my way into web development and have seen the word postback thrown around. Coming from a non-web based background, what does a new web developer have to know about postbacks? (i.e. what are they and when do they arise?)
Any more information you'd like to share to help a newbie in the web world be aware of postbacks would be most greatly appreciated.
The following is aimed at beginners to ASP.Net...
When does it happen?
A postback originates from the client browser. Usually one of the controls on the page will be manipulated by the user (a button clicked or dropdown changed, etc), and this control will initiate a postback. The state of this control, plus all other controls on the page,(known as the View State) is Posted Back to the web server.
What happens?
Most commonly the postback causes the web server to create an instance of the code behind class of the page that initiated the postback. This page object is then executed within the normal page lifecycle with a slight difference (see below). If you do not redirect the user specifically to another page somewhere during the page lifecycle, the final result of the postback will be the same page displayed to the user again, and then another postback could happen, and so on.
Why does it happen?
The web application is running on the web server. In order to process the user’s response, cause the application state to change, or move to a different page, you need to get some code to execute on the web server. The only way to achieve this is to collect up all the information that the user is currently working on and send it all back to the server.
Some things for a beginner to note are...
The state of the controls on the posting back page are available within the context. This will allow you to manipulate the page controls or redirect to another page based on the information there.
Controls on a web form have events, and therefore event handlers, just like any other controls. The initialisation part of the page lifecycle will execute before the event handler of the control that caused the post back. Therefore the code in the page’s Init and Load event handler will execute before the code in the event handler for the button that the user clicked.
The value of the “Page.IsPostBack” property will be set to “true” when the page is executing after a postback, and “false” otherwise.
Technologies like Ajax and MVC have changed the way postbacks work.
From wikipedia:
A Postback is an action taken by an
interactive webpage, when the entire
page and its contents are sent to the
server for processing some information
and then, the server posts the same
page back to the browser.
Expanding on the definitions given, the most important thing you need to know as a web-developer is that NO STATE IS SAVED between postbacks. There are ways to retain state, such as the Session or Viewstate collections in ASP.NET, but as a rule of thumb write your programs where you can recreate your state on every postback.
This is probably the biggest difference between desktop and web-based application programming, and took me months to learn to the point where I was instinctively writing this way.
Postback happens when a webpage posts its data back to the same script/dll/whatever that generated the page in the first place.
Example in C# (asp.net)
...
if (!IsPostback)
// generate form
else
process submitted data;
Web developement generally involves html pages that hold forms (<form> tags). Forms post to URLs. You can set a given form to post to any url you want to. A postback is when a form posts back to it's own page/url.
The term has special significance for ASP.Net WebForms developers, because it is the primary mechanism driving a lot of the behavior for a page — specifically 'event handling'. ASP.Net WebForms pages have exactly one server form which nearly always posts back to itself, and these postbacks trigger execution on the server of something called the Page Lifecycle.
The term is also used in web application development when interacting with 3rd party web-service APIs
Many APIs require both an interactive and non-interactive integration. Typically the interactive part is done using redirects (site 1 redirects a user to site 2, where they sign in, and are redirected back). The non-interactive part is done using a 'postback', or an HTTP POST from site 2's servers to site 1's servers.
When a script generates an html form and that form's action http POSTs back to the same form.
Postback is essentially when a form is submitted to the same page or script (.php .asp etc) as you are currently on to proccesses the data rather than sending you to a new page.
An example could be a page on a forum (viewpage.php), where you submit a comment and it is submitted to the same page (viewpage.php) and you would then see it with the new content added.
See: http://en.wikipedia.org/wiki/Postback
Postback refers to HTML forms. An HTML form has 2 methods: GET and POST. These methods determine how data is sent from the client via the form, to the server. A Postback is the action of POSTing back to the submitting page. In essence, it forms a complete circuit from the client, to the server, and back again.
A post back is anything that cause the page from the client's web browser to be pushed back to the server.
There's alot of info out there, search google for postbacks.
Most of the time, any ASP control will cause a post back (button/link click) but some don't unless you tell them to (checkbox/combobox)
Yet the question is answered accurately above, but just want to share my knowledge .
Postback is basically a property that we can use while doing some tasks that need us to manage the state of the page, that is either we have fired some event for e.g. a button click or if we have refreshed our page.
When our page loads for the very first time , that is if we have refreshed our page, at that time postback-property is false, and after that it becomes true.
if(!ispostback)
{
// do some task here
}
else
{
//do another task here
}
http://happycodng.blogspot.in/2013/09/concept-of-postback-in.html