I think this will be a weird one for you as I am at my wits end with this. On a screen I have in a table, I have a link being clicked that is setting off a javascript/ajax request. I have similar code in another screen that works perfectly as it heads down into the success part of the ajax call and runs code in the success portion of the call. For some reason though I can't seem to get this to work and when I debug it in chrome, I lose my breakpoints and it never seems to get into the success portion of the Ajax call.
#section scripts{
<script>
// Get the bond ID Data from the row selected and return that to the program.
function getIDData(el) {
var ID = $(el).closest('tr').children('td:first').text();
var iddata = {
'ID': ID
}
console.log(iddata);
return iddata;
}
// Submit the data to a function in the .cs portion of this razor page.
$('.updatelink').click(function () {
var bondid = JSON.stringify(getIDData(this));
$.ajax({
url: '/Maintenance/Bond_Maint?handler=UpdateandReloadData',
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
type: 'POST',
dataType: 'json',
data: { bondid: bondid },
success: function (result) {
if (result.pass != undefined) {
document.forms[0].submit();
}
},
});
});
</script>
}
The ASP.net code behind that is calling does an update to the database and then passes back a variable containing Success as its message.
//-------------------------------------------------------------------------------
// Try to get and insert the data from a selected row and copy it
//-------------------------------------------------------------------------------
public ActionResult OnPostUpdateandReloadData(string bondid)
{
return new JsonResult(new { pass = "Success" });
}
I'm not sure how else to describe my issue other than when I debug my other code via the browser, it appears to take a different path than this code does and I cannot fathom why. For reference my other code looks like this:
#section scripts{
<script>
// Get the offender ID Data from the row selected and return that to the program.
function getIDData(el) {
var ID = $(el).closest('tr').children('td:first').text();
var iddata = {
'ID': ID
}
console.log(iddata);
return iddata;
}
// Submit the data to a function in the .cs portion of this razor page.
$('.copybtn').click(function () {
var offenderid = JSON.stringify(getIDData(this));
$.ajax({
url: '/Copy_Old_Account?handler=CopyData',
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
type: 'POST',
dataType: 'json',
data: { offenderid: offenderid },
success: function (result) {
if (result.path != undefined) {
window.location.replace(result.path);
}
},
});
});
</script>
}
Any help would be appreciated.
Okay guys so first off, thank you everyone for responding to my question. Frank Writte and Alfred pointed me into the right direction by looking for the status in the network tab for my calls. I found out that I was getting cancellations for my requests. After looking into that I found this article What does status=canceled for a resource mean in Chrome Developer Tools? that has an answer from FUCO that gave me what I needed to do. Apparently I needed to add event.preventDefault(); in front of my ajax call and all of a sudden my code worked. I'm not sure I completely understand why this works but I can't complain about the results. Again thank you everyone for trying to help. This one has been boggling my mind all morning.
Related
I m running the following script with success : it updates the text every 3s
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<script>
$(function() {
window.setInterval(function() {
loadNewText()
}, 3000)
function loadNewText() {
$.ajax({
url: "/update_report",
type: "POST",
dataType: "json",
success: function(data) {
$(report).replaceWith(data)
}
});
}
});
</script>
I want to change the function in HTML to run 'loadNewText()' only if there's changes in certain variable in Python code !
I've put the variables in python route :
#app.route('/console-output')
def console_output():
fileHandle = open("console_output.txt", "r")
lineList = fileHandle.readlines()
fileHandle.close()
last= lineList[len(lineList)-1]
with open('console_output.txt', 'r') as r:
co =r.read()
return render_template("console-output.html",console_output_msg=console_output_msg, last=last, co=co)
and write the following code in HTML :
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<script>
$(function() {
if (last != console_output_msg) {
loadNewText();
}
function loadNewText() {
$.ajax({
url: "/update_text",
type: "POST",
dataType: "json",
success: function(data) {
$(new_text).replaceWith(data)
}
});
}
});
</script>
This method is not working ! I don't have a big experience with Javascript! I don't know if I m not calling the variables (last, console_output_msg) the right way or my function is not valide !
If there's any way to correct it or any other suggestion to call 'loadNewText()' when changes happens in python code !
Thanks!
There are 2 popular ways to update the text when there is a change in Python:
Long polling
Using setInterval() function to trigger an ajax call to the server to check if there are any changes.
WebSocket
Implement a WebSocket connection between the server and browser. Receive the message sent from the server.
Link for implement WebSocket in Python.
https://websockets.readthedocs.io/en/8.1/intro.html
You can't access server variables on the client.
You could save the previous output in a JavaScript variable, and only update the DOM if it has changed. You need to put the if statement inside the loadNewText() function, after it has received the response, so it can compare it.
This won't skip the AJAX call, but it will avoid refreshing the page when nothing has changed.
$(function() {
let last_output;
window.setInterval(loadNewText, 3000)
function loadNewText() {
$.ajax({
url: "/update_report",
type: "POST",
dataType: "json",
success: function(data) {
if (data != last_output) {
$(report).replaceWith(data);
last_output = data;
}
}
});
}
});
so this is a hard one for me to try and explain. I have a razor page that when a button is clicked it calls a javascript function which makes an ajax call to a handler in the back end. The handler does some stuff and gets a id that I want to pass to another page. I am trying to use the RedirectToPage function in the back end but the screen never opens. It successfully calls the handler but when the handler does its return, nothing happens. Is there a way to do this?
Here is the javascript/ajax code that gets called from a button being clicked.
#section scripts{
<script>
// Get the account ID Data from the row selected and return that to the program.
function getIDData(el) {
var ID = $(el).closest('tr').children('td:first').text();
var iddata = {
'ID': ID
}
console.log(iddata);
return iddata;
}
// Submit the data to a function in the .cs portion of this razor page.
$('.copybtn').click(function () {
var accountid = JSON.stringify(getIDData(this));
$.ajax({
url: '/Copy_Old_Account?handler=CopyData',
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
type: 'POST',
dataType: 'json',
data: { offenderid: offenderid },
success: function (result) {
},
});
});
</script>
}
For my code behind code that I am calling from the ajax call, that's below here:
public ActionResult OnPostCopyData (string accountid)
{
// Do my other stuff here
return RedirectToPage("Account_Information", new { id = account.Account_ID });
}
Any help would be appreciated and if doesn't make sense, I can try and clear up any questions.
I think this is what you want, I did something similar in an MVC 5 project and I haven't tested it in Razor Pages yet:
This would be your method, note that you should add your Controller to the Url.Action, and I personally haven't tried passing a parameter along with the url but I image it'll work just fine
[HttpPost]
public ActionResult SubmitSomething()
{
return Json(new { redirectUrl = Url.Action("Account_Information", "YOUR_CONTROLLER_NAME", new { id = account.Account_ID }) });
}
And then this would be your Ajax request, I updated the success portion
// Submit the data to a function in the .cs portion of this razor page.
$('.copybtn').click(function () {
var accountid = JSON.stringify(getIDData(this));
$.ajax({
url: '/Copy_Old_Account?handler=CopyData',
beforeSend: function (xhr) {
xhr.setRequestHeader("XSRF-TOKEN",
$('input:hidden[name="__RequestVerificationToken"]').val());
},
type: 'POST',
dataType: 'json',
data: { offenderid: offenderid },
success: function (result) {
if (result.redirectUrl !== undefined) {
window.location.replace(result.redirectUrl);
} else {
// No redirect found, do something else
}
},
});
});
This isn't tested, so I can only hope that it works for you right now
Edit: Updated the Url.Action to use OP's view names and parameters
Redirect to page returns a 301 response, which will be in the format:
HTTP/1.1 301 Moved Permanently
Location: http://www.example.org/index.asp
To redirect after the ajax call you can redirect to the requested url by:
success: function (result) {
window.location = result.getResponseHeader('Location');
}
I have two buttons on the form I'm getting, this first piece of coce allow me to know which was the button clicked by getting the id of it.
var button;
var form = $('.register_ajax');
$('#vote_up, #vote_down').on("click",function(e) {
e.preventDefault();
button = $(this).attr("id");
});
and this other send the form data through AJAX using the info already obtained from the button using the script above.
form.bind('submit',function () {
$.ajax({
url: form.attr('action'),
type: form.attr('method'),
cache: false,
dataType: 'json',
data: form.serialize() + '&' + encodeURI(button.attr('name')) + '=' + encodeURI(button.attr('value')) ,
beforeSend: function() {
//$("#validation-errors").hide().empty();
},
success: function(data) {
if(data.message == 0){
$("#fave").attr('src','interactions/favorite.png');
$("#favorite").attr('value',1);
console.log(data.errors);
}
if(data.message == 1)
{
$("#fave").attr('src','interactions/favorite_active.png');
$("#favorite").attr('value',0);
}
if(data.message == "plus")
{
$("#vote_up").attr('class','options options-hover');
$("#vote_down").attr('class','options');
console.log(data.message);
}
if(data.message == "sub")
{
$("#vote_down").attr('class','options options-hover');
$("#vote_up").attr('class','options');
console.log("sub");
}
},
error: function(xhr, textStatus, thrownError) {
console.log(data.message);
}
});
return false;
});
The problem is that the data is not being passed to the ajax function, the button info is being saved on the button var, but it's not being obtained at time on the ajax call to work with it (or at least that is what I think). I'd like to know what can I do to make this work, any help appreciated.
1st edit: If I get the button data directly like button = $('#vote_up'); it doesn't work either, it only works if I get the button directly like this but without using the function.
2nd edit: I found the solution, I posted below.
var button is in the scope of the .on('event', function(){})
You need to declare the variable in the shared scope, then you can modify the value inside the event callback, i.e.
var button,
form = $('.register_ajax');
$('#vote_up, #vote_down').on("click",function(e) {
e.preventDefault();
button = $(this).attr("id");
});
You are being victim of a clousure. Just as adam_bear said you need to declare the variable outside of the function where you are setting it, but you are going to keep hitting these kind of walls constantly unless you dedicate some hours to learn the Good Parts :D, javascript is full of these type of things, here is a good book for you and you can also learn more from the author at http://www.crockford.com/.
I Found the solution, I just changed a little bit the click function like this:
var button;
var form = $('.register_ajax');
var data = form.serializeArray();
$('#vote_up, #vote_down').on("click",function(e) {
e.preventDefault();
button = $(this).attr("id");
data.push({name: encodeURI($(this).attr('name')), value: encodeURI($(this).attr('value'))});
form.submit();
});
using e.preventDefault(); and form.submit(); to send the form. also I changed the data.serialize to serializeArray(); because it's more effective to push data into the serializeArray(). in the second script I just changed the data.serialize() and used the data variable that I already filled with the serializeArray() and the data.push():
form.bind('submit',function () {
alert(button);
$.ajax({
url: form.attr('action'),
type: form.attr('method'),
cache: false,
dataType: 'json',
data: data,
//here goes the rest of the code
//...
});
return false;
});
it worked for me, it solved the problem between the click and submit event that wasn't allowing me to send the function through ajax.
I have a function here from a change event on a dropdownlist. When the selection gets changed I want to update a row in my database. Should I use javascript or ajax. I don't want the page to be refreshed. I think it should be ajax, but not sure? If ajax, can anyone point me to a tutorial/video/etc?
Here is where I want to update my db row.
var statusdropdown = document.getElementById("enumstatus");
statusdropdown.addEventListener("change", function(event) {
// call db and update row
}, false);
Looks like you using asp.net mvc.
You can write your ajax calls with pure javascript Ajax docs or the easiest way, using JQuery.
You need to add one action on your controller to receive the ajax data, and then insert/update your db.
See this, this and this.
Most common scenario would be making an ajax call using HTTP POST/PUT to a controller method, which would then handle the data and update the database directly or pass through to your service/data layer code.
Probably the easiest way to make the call would be using the jQuery.ajax method. Documentation can be found here: http://api.jquery.com/jquery.ajax/
You can try something like this
<script type="text/javascript">
$(function () {
$('#btnSubmit').click(function () {
var name = $('#TextBox1').val();
var email = $('#TextBox2').val();
if (name != '' && email != '') {
$.ajax
({
type: 'POST',
url: 'Home/UpdateDB', //if it is plain asp.net then UpdateDB is declared as WebMethod
async: false,
data: "{'name':'" + name + "','email':'" + email + "'}",
contentType: 'application/json; charset =utf-8',
success: function (data) {
var obj = data.d;
if (obj == 'true') {
$('#TextBox1').val('');
$('#TextBox2').val('');
alert("Data Saved Successfully");
}
},
error: function (result) {
alert("Error Occured, Try Again");
}
});
}
})
});
</script>
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I need to create a script that takes data from a form, send it to a server (there's some diabolical C# procedure on it, that's not my job...), the server resolves the string and reply me with 4 strings (yup, they are in spanish): 'pendiente', 'verificada', 'rechazada', and finally 'error'
Now, I have to get that response and properly show the correct message (hidden-inline html).
All this procedure shouldn't "refresh" the actual page, so I'm using AJAX for this.
Have in mind I'm a newbie :) I've learned Jquery just for this task,
and I have to say I'm quite happy with this.
The problem
I don't really know how to handle or "manipulate" that request using Jquery... I figured how to send the data to the server, but I think I'm handling incorrectly the response.
The code:
In this case I've adapted the script, every different response should get its own border color, I'm using conditionals (they are wrong for sure) to add CSS clases to an #ajax div.
So, it might have silly errors...
$(document).ready(function () {
$('#enviar').click(function (event) {
event.preventDefault(); //avoid page refresh
var consulta = $('#string').val();
$("#normal").text(consulta);
//Start AJAX!
$.ajax({
async: true,
cache: false,
type: 'post',
url: 'http://184.22.97.218:8081/chequeostatusdonation', //la del servr
data: {
html: consulta
},
dataType: 'html',
beforeSend: function () {
console.log('Sending...');
},
success: function (data) {
console.log('Just sent -'+data+'- with success dooh');
$('#ajax').html(data);
//start conditional
if (data == pendiente) {
$("#ajax").addClass(pendiente);
} else if (data == verificada) {
$("#ajax").addClass(verificada);
} else if (data == rechazada) {
$("#ajax").addClass(rechazada);
} else {
$("#ajax").html('<h1>error</h1>');
}
//end condicional
},
complete: function () {
console.log('Listo el pollo');
}
});
});
});
Here is the JSFiddle
Edit: Now, I just found these two links
learn.jquery.com/code-organization/concepts/
learn.jquery.com/code-organization/beware-anonymous-functions/
Screw my code! :D
Async is by default "true", so you don't need to mention that one in your code.
You included a link to the server (in the URL-field), but what is the file you are trying to open? You will need to include the path to where you will get the data from (file / script). To make Ajax work, you will need to respect the "same origin policy", so you can insert a relative path to the file / script.
Is the response of your call always a short string with one of those key words ('pendiente', 'verificada', 'rechazada' or 'error)? In that case I would recomment using "text" instead of "html" as dataType, as jQuery will try to parse it to a DOM-structure, which is not what you want here.
Your if-statements (and class-assignments as well) aren't working because you try to compare it to a non-excisting variable instead of the string with that value. You should use " or ' around your string to solve that.
This code should be working. If not, let me know. Include the error given in the console of the browser.
$(document).ready(function () {
$('#enviar').click(function (event) {
event.preventDefault(); //avoid page refresh
var consulta = $('#string').val();
$("#normal").text(consulta);
//Start AJAX!
$.ajax({
type: 'POST',
cache: false,
url: 'RELATIVE_PATH_HERE', //la del servr
data: {
html: consulta
},
dataType: 'text',
beforeSend: function () {
console.log('Sending...');
},
success: function (data) {
console.log('Just sent -'+data+'- with success dooh');
$('#ajax').html(data);
//start conditional
if (data === 'pendiente') {
$("#ajax").addClass('pendiente');
} else if (data === 'verificada') {
$("#ajax").addClass('verificada');
} else if (data === 'rechazada') {
$("#ajax").addClass('rechazada');
} else {
$("#ajax").html('<h1>error</h1>');
}
//end condicional
},
complete: function () {
console.log('Listo el pollo');
},
error: function() {
console.log('Problem with XHR-request');
});
});
});
Be careful with .addClass if you process multiple Ajax-calls as they will add on each other.