I have an ASP.net MVC project and depending on the filter options chosen by the user I am sending different ajax requests to the same actionresult, for example:
$(document).on("click", "#filter_reset_button", function () {
var url = "/Admin/Index";
ajaxRequest({
url: url,
type: "get",
data: { reset: true },
successCallback: function () {
window.location.href = url;
}
});
});
Other listeners sent different data, something like:
data: { page: 2, filterUpdate: true }
and so on. The Index ActionResult returns different lists of items, depending on different options chosen in the data and the code works completely fine.
A colleage of mine told me, that my code is actually sending two get requests to the AR everytime, so its not efficient. Is that true? And if its the case, how can I refactor it. to make it just one request? If I let window.location.href = url part out, the site actually doesnt load the server response.
Yes you are doing 2 request in button click. First in Ajax Get, Second in Success Call Back.
But Why are you calling window.location.href = url; success call back. ?
If you want update the page after click, you can do partial updates to page. Check this post.
That is correct 2 request called.
First request when you call AJAX get to Action Index in Admin Controller.
Second request when you set window.location.href = url, it will same as you enter /Admin/Index in browser.
In this case you only need window.location.href = '/admin/index?reset=true' in click function
You can see the post here at this post
Actually on success callback you must change your code accordingly to the above post
Related
I am using Laravel 5.3. I want to insert the data using blade template.But my when i press submit button it gets refreshed every time. what to do? and please anyone tell me how to use ajax url,type,data
If you try to submit via Javascript make sure prevent form default action with e.preventDefault(). This code prevent the form submitted in a regular way. Just add this code to wrap your AJAX call:
$('#form-id').submit(function(e){
e.preventDefault();
$.ajax({...});
});
I just assume you are using jquery if you are talking about ajax. It's really simple. Your laravel routes listen to "post", "get", "patch", "delete" methods.
Everything of these can be created with a ajax request - example:
$.ajax({
method: "POST",
url: "/posts",
data: { title: "Hello World", text: "..." }
})
.done(function( post ) {
// assuming you return the post
alert(post.title + " created");
});
Now that you use ajax you will not want to return a view to the ajax call. You have different options here (create a new route, helper functions etc.) I will give the most easy example
Controller function:
public function store(Request $request) {
$post = App\Post::create($request->all());
if($request->ajax()) {
return $post;
} else {
return redirect('/posts');
}
}
now you controller will return data on ajax calls and will redirect you on default calls without ajax.
Finally you have a last thing to keep in mind. If you have web middleware applied ( done by default ) you need to handle the csrf token. The most easy way to handle this is by adding a meta tag to your html head
and then (before doing all your calls etc.) add this to configure your ajax
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="_token"]').attr('content')
}
});
this will add the valid csrf token which is in your head to every ajax call and will ensure you not run into token missmatch exceptions.
Things to keep in mind:
- if you stay very long on one page tokens might expire ( laravel-caffeine will help here )
- you need to handle validation for ajax calls
from Ajax the controller does get the keyword I want, as it confirms it (because I echo it), and my idea was that on getting that keyword, it should redirect to the page I want. Yet, it does not, and also, while it does change the locale, I have to reload the page, otherwise, it won't show any translation and locale changes on the page. In Firebug when I hover over the POST, I get the correct URL to where I would want to go: sort of http://myweb.com/es but the controller does not change the http URL box of my browser on my web to go there.
I am simplifying the Controller code here, but actually I will want it to go to different URLs depending on the keyword it gets, something that I would do with a switch statement or IF else if etc.
So the controller is as simple as this:
public function changelanguage()
{
$lang = \Input::get('locale');
echo "I got $lang";
Session::put('locale', $lang);
return redirect('/es');
}
If instead of using ajax I use a Form, then I dont need to reload, the Action of the form makes the controller change the locale and translate the page without reloading. But I need to use ajax and in any case, the controller does get correctly the keyword ('en', 'es', 'de' etc ) for languages, so it should take it from there and redirect me to the URL page, but it just doesnt move.
if you are curious about the Ajax, here it is, but it does send the keyword as I said.
$(document).ready(function(){
$('.choose-language').on('click', function(e){
e.preventDefault();
var selectedlanguage = $(this).data('value');
$.ajax({ // so I want to send it to the controller
type:"POST", // via post
url: 'language',
data:{'locale': selectedlanguage},
}); // HERE FINISHES THE $.POST STUFF
}); //HERE FINISHES THE CLICK FUNCTION
}); // HERE FINISHES THE CODE
ROUTES
Route::post('language', array(
'as' =>'language',
'uses' => 'LanguageController#changelanguage'
));
If you’re trying to perform the redirect in the AJAX-requested script, then it won’t work. You can’t redirect from a script request via AJAX otherwise people would be doing all kinds of nefarious redirects.
Instead, set up a “success” handler on your AJAX request that refreshes your page if the request was successful. It can be as simple as:
var url = '/language';
var data = {
locale: $(this).data('value');
};
var request = $.post(url, data)
.success(function (response) {
// Script was successful; reload page
location.reload();
});
I’m not sure how you’re allowing users to select locales, but since you need a reload any way I think AJAX is pointless here. Just have a traditional form that submits the new locale to an action, set the locale in a session/cookie/whatever, and then redirect back to the referring page.
I have the following jQuery:
$.ajax({
type: 'POST',
url: "MyController/MyAction",
data: $("form").serialize(),
dataType: "json"
});
And here is MyAction:
if(ModelState.IsValid)
{
return RedirectToAction("OtherAction", new {id = 5});
}
I have this setup in three different places(three different actions). In two actions I can redirect just fine. However in one action I cannot redirect. Nothing happens, I just stay on the same page. I stepped through my code and all the lines are getting hit in MyAction, but my breakpoint in OtherAction never gets hit.
Is there something special I should be doing? In the two instances that work I am posting from/to the same controller. In the Instance above the jQuery is in a page under HomeController posting to an action in MyController
This won't affect the main page since the redirect to action will just do a redirect and return the redirected response to the Ajax call.
The page that made the ajax request will not be redirected since the response is just seen as any other response. There was just one extra step (redirect) to arrive at the AJAX result.
If you want the main page to be redirected, you can handle that in the callback for the ajax request
I have a probleme with ah changePage.
I want to switch the Page after an Ajax call.
If the form get submit, this function will be executed, but after the ajax call the page does not switch.
If I wanna set a Breakpoint on this call, it do not stop.
What can I do, that I can switch the page after the ajax call.
$("#serialNumber").submit(function() {
$.ajax({
type: "POST",
url: "mobilemain.do",
data: "serialNumberInput=" + $("#serialNumberInput").val(),
success: function(msg)
{
$.mobile.changePage("#machine_manuals", "slide");
}
});
});
Edit:
Ok!
I found some hint to my Problem.
The SAP-Server call is from the form-submit and not from my ajax-call.
He never goes in the method above.
On my Server, I made that:
l_view = create_view( view_name = 'main.htm').
call_view( l_view ).
But I does not wanna call the main.htm .
I wanna call the second page in the jquery mobile project. (main.htm#machine_manuals)
How does that work?
Other than the page you are changing to, all options for $.mobile.changePage are passed as a key-value pair in an object.
Your changePage should look like this:
$.mobile.changePage("#machine_manuals", {transition: "slide"});
The documentation for the method, and the options available can be found here:
http://api.jquerymobile.com/jQuery.mobile.changePage/
I have a html page that I need to call another asp page to get the date/hour via an ajax call. Which method would be better or best, Post or Get?
Since I am only retrieving a few bits of data and not sending any data to the page info is one method better or proper than the other?
This is the simple ASP page.
<%#LANGUAGE="VBSCRIPT"%>
<% Option Explicit %>
<%=Weekday(Date)%>
<%=Hour(Now)%>
And this is the Ajax call to the asp page above.
jQuery.ajax({
url: '/v/timecheck.asp',
type: 'GET',
cache: false,
success: function(data){
// do something with the data
},
error: function() {
//do something on error
return false;
}
})
The reason I have to make the Ajax call to this ASP page is I cannot query the server direct from this page.
My rule of thumb when deciding either one is:
The interaction involve database, POST
The interaction involve sensitive information, POST
Requesting simple data, GET
Sending user input, POST
Sending/requesting large data, POST
Clean URL, POST
As you can see, most cases involve POST for many reason. Such as in your case, you could use GET or POST. Either way, jQuery make calling both function easy.
A simpler $.POST
$.post("/v/timecheck.asp", function (data) {
if (data.time != "") {
//retrieve success
{
else
{
//retrieve fail
};
});
or simpler $.GET
$.get("/v/timecheck.asp", function(data) {
if (data.time != "") {
//retrieve success
{
else
{
//retrieve fail
};
});
I would use POST, I think there is a secirity reason in ASP.NET to use POST, but not sure if this relates to IIS (and possibly ASP)
The W3C have a paper with guidelines on when to use GET or POST at: http://www.w3.org/2001/tag/doc/whenToUseGet-20040321#checklist
Using a GET request allows the result to be cached by the browser whereas a POST request won't be cached and the page will be re-retrieved every time.
In your code example you are not changing any data as a result of the request and are only providing the day and hour, so using a GET and setting the cache HTTP headers to 1 hour would give you the best performance and reduce load on your server.