I have an HTML able, which I bind by using the following Action in MVC controller:
public ActionResult BindTable(int ? page)
{
int pageSize = 4;
int pageNumber = 0;
List<Users> _users = query.ToList();
return View(_users.ToPagedList(pageNumber, pageSize));
}
Below the table I have the following HTML:
<textarea class="form-control" style="resize:none;" rows="9" placeholder="Enter value here..." id="txtValue"></textarea>
<br />
<button style="float:right; width:100px;" type="button" onclick="CallFunction()" class="btn btn-primary">Update specific record</button>
The Javascript function responsible for calling the action is as following:
function CallFunction() {
if ($('#txtValue').val() !== '') {
$.ajax({
url: '/User/UpdateUser',
type: 'POST',
data: { txt: $('#txtValue').val() },
success: function (data) {
$('#txtValue').val('');
alert('User updated!');
},
error: function (error) {
alert('Error: ' + error);
}
});
}
And here is the Action responsible for updating the user:
public ActionResult UpdateUser(string txtValue)
{
var obj = db.Odsutnost.Find(Convert.ToInt32(1));
if(obj!=null)
{
obj.Text= txtValue;
obj.Changed = true;
db.SaveChanges();
return RedirectToAction("BindTable");
}
return RedirectToAction("BindTable");
}
Everything works fine. But the table doesn't updates once the changes have been made ( it doesn't binds ?? )...
Can someone help me with this ???
P.S. It binds if I refresh the website.. But I want it to bind without refreshing the website...
I created a BIND function with Javascript, but it still doesn't binds:
function Bind() {
$(document).ready(function () {
var serviceURL = '/User/BindTable';
$.ajax({
type: "GET",
url: serviceURL,
contentType: "application/json; charset=utf-8",
});
});
}
You're not actually updating the page after receiving the AJAX response. This is your success function:
function (data) {
$('#txtValue').val('');
alert('User updated!');
}
So you empty an input and show an alert, but nowhere do you modify the table in any way.
Given that the ActionResult being returned is a redirect, JavaScript is likely to quietly ignore that. If you return data, you can write JavaScript to update the HTML with the new data. Or if you return a partial view (or even a page from which you can select specific content) then you can replace the table with the updated content from the server.
But basically you have to do something to update the content on the page.
In response to your edit:
You create a function:
function Bind() {
//...
}
But you don't call it anywhere. Maybe you mean to call it in the success callback?:
function (data) {
$('#txtValue').val('');
Bind();
alert('User updated!');
}
Additionally, however, that function doesn't actually do anything. For starters, all it does is set a document ready handler:
$(document).ready(function () {
//...
});
But the document is already loaded. That ready event isn't going to fire again. So perhaps you meant to just run the code immediately instead of at that event?:
function Bind() {
var serviceURL = '/User/BindTable';
$.ajax({
type: "GET",
url: serviceURL,
contentType: "application/json; charset=utf-8",
});
}
But even then, you're still back to the original problem... You don't do anything with the response. This AJAX call doesn't even have a success callback, so nothing happens when it finishes. I guess you meant to add one?:
function Bind() {
var serviceURL = '/User/BindTable';
$.ajax({
type: "GET",
url: serviceURL,
contentType: "application/json; charset=utf-8",
success: function (data) {
// do something with the response here
}
});
}
What you do with the response is up to you. For example, if the response is a completely new HTML table then you can replace the existing one with the new one:
$('#someParentElement').html(data);
Though since you're not passing any data or doing anything more than a simple GET request, you might as well simplify the whole thing to just a call to .load(). Something like this:
$('#someParentElement').load('/User/BindTable');
(Basically just use this inside of your first success callback, so you don't need that whole Bind() function at all.)
That encapsulates the entire GET request of the second AJAX call you're making, as well as replaces the target element with the response from that request. (With the added benefit that if the request contains more markup than you want to use in that element, you can add jQuery selectors directly to the call to .load() to filter down to just what you want.)
Related
That's my script on my view.
$(function () {
$('#buttonx').on("click", function (e) {
e.preventDefault();
$.ajax({
url: 'Ficha/VerificarPatrocinador',
contentType: 'application/json; charset=utf-8',
type: 'GET',
dataType: 'json',
data: {i: 100036},
success: function (data) {
$(data).each(function (index, item) {
//$('#NomePatr').append(item.Nome)
$("#NomePatr").val(item.Nome);
});
}
});
});
});
</script>
That's my action on my controller.
public JsonResult VerificarPatrocinador(int i)
{
var db = new FMDBEntities();
db.Configuration.ProxyCreationEnabled = false;
db.Configuration.LazyLoadingEnabled = false;
var consulta = db.Tabela_Participante.Where(p => p.ID_Participante == i);
return Json(consulta.
Select(x => new
{
Nome = x.Nome
}).ToList(), JsonRequestBehavior.AllowGet);
}
I'm a newbie in Ajax/Jquery, when I exclude the parameter it is ok, however, when I try to put the data: {i: 100036} in my script and the parameter in my action. It doesn't work. Why is it happening?
The controller is going fine. The parameter even passes, but I can't return this result in my View.
Thank you.
use [HttpPost] attribute on your controller method
[HttpPost]
public JsonResult VerificarPatrocinador(int i)
{
//Write Your Code
}
and change the ajax type attribute from "GET" to "POST" and use JSON.stringify. Also check the url carefully. your ajax should look like this
$(function () {
$('#buttonx').on("click", function (e) {
e.preventDefault();
$.ajax({
url: 'Ficha/VerificarPatrocinador',
contentType: 'application/json; charset=utf-8',
type: 'POST',
dataType: 'json',
data: JSON.stringify({i: 100036}),
success: function (data) {
$(data).each(function (index, item) {
//$('#NomePatr').append(item.Nome)
$("#NomePatr").val(item.Nome);
});
}
});
});
});
Hope it will help you
I think that #StephenMuecke may be on to something, because I was able to reproduce the (intended) logic with a new project.
The first thing to determine is where the code is going wrong: the server or the client.
Try using the Visual Studio debugger, and placing a breakpoint in VerificarPatrocinador. Then run the client code to see if the breakpoint is hit. When this succeeds, this means the problem is on the client end.
From there use the web browser's debugger in order to determine what is happening. Use the .fail function on the return result from .ajax in order to determine if there was a failure in the HTTP call. Here is some sample code that you can use to analyze the failure:
.fail(function (jqXHR, textStatus, errorThrown) {
alert(textStatus);
});
For more information check out http://api.jquery.com/jquery.ajax/
Change following code when ajax success
$.each(data, function (index, item) {
$("#NomePatr").val(item.Nome);
});
because when you are getting data as object of array, array or collection you can iterate using this syntax and then you can pass to var,dom...and so on where you want to display or take.
jQuery.each() means $(selector).each() you can use for dom element like below syntax: for example
<ul>
<li>foo</li>
<li>bar</li>
</ul>
<script>
$("li").each(function( index ) {
console.log( index + ": " + $( this ).text() );
});
</script>
Using GET is working fine but if it is not secure because data is visible to user when it submit as query string.
while post have
Key points about data submitted using HttpPost
POST - Submits data to be processed to a specified resource
A Submit button will always initiate an HttpPost request.
Data is submitted in http request body.
Data is not visible in the url.
It is more secured but slower as compared to GET.
It use heap method for passing form variable
It can post unlimited form variables.
It is advisable for sending critical data which should not visible to users
so I hope you understand and change ajax type:'GET' to 'POST' if you want.
$.each() and $(selector).each()
Change this line
url: 'Ficha/VerificarPatrocinador'
to:
url: '/Ficha/VerificarPatrocinador'
Because when you use this url "Ficha/VerificarPatrocinador", it will call the API from url: current url + Ficha/VerificarPatrocinador,so it isn't correct url.
I have button and when It clicked process event have been called and parameter passed to the event.
Here the code:
<input type="button" value="Accessing Layers" onclick="process('AccessingLayers');" />
function process(actionName) {
$.ajax({
url: '#Url.Action(actionName)',
type: 'POST',
data: {
sessionID: parent.parent.mapFrame.sessionId,
mapName: parent.parent.mapFrame.mapName
},
success: function (result) {
alert('Successfully passed data to controller');
}
});
}
But in this row:
url: '#Url.Action(actionName)'
I get this error:
The name 'actionName' does not exist in the current context
Any idea why I get error above?
And how to fix it?
Remember razor code executes on the server before the your client side code gets executed. So you cannot pass a javascript variable to a razor method like that.
If you still want to build the url using the Url.Action helper method and pass it to your process method, you should call the Url.Action method with correct arguments(the action method,controller name etc..) and generate the url and pass the url( generated by razor) to your javascript method as a string parameter value
<input type="button" value="Accessing Layers"
onclick="process('#Url.Action("AccessingLayers")')" />
and your js code
function process(actionUrl) {
$.ajax({
url: actionUrl,
// existing code
});
}
<input type="button" value="Accessing Layers" id="btnAccessingLayers" />
and in scripts section
$(document).ready(function () {
$('#btnAccessingLayers').on('click', function(){
process('#Url.Action("AccessingLayers")');
}
});
function process(actionUrl) {
$.ajax({
url: actionUrl,
// existing code
});
}
Everything typed between quotes is parsed as plain text, therefore no computation is performed on retrieving value of actionName.
You have to break your url like this:
url: '#Url.Action('+actionName+')'
so that actionName gets resolved as variable.
Why won't my function work after ajax has succeed?
I have a custom function named filter(), defined in the header as javascript file.
Then i have a series of jquery code to dynamically retrieve data from the server to populate the select box. I would like to call the filter() after the AJAX request has completed since the filter() will manage populated the select box's option.
$.ajax({
url: "checkersc2.php", //This is the page where you will handle your SQL insert
type: "GET",
data: values, //The data your sending to some-page.php
success: function (response) {
$('#loading-image').css('display', 'none');
$dropdownCondition.html(response);
filter();
},
error: function () {
console.log("AJAX request was a failure");
}
});
EDIT: my filter() code is a little long, # http://jsfiddle.net/tongky20/re5unf7p/11/
It looks like you have an invalid selector for dropdownCondition. It probably fails on that line and never calls filter. Unless you defined that variable else where try updating it to a valid element selector and see if it calls filter. Something like:
$('#dropdownCondition').html(response);
Assuming the element id is dropdownCondition.
Full function:
$.ajax({
url: "checkersc2.php", //This is the page where you will handle your SQL insert
type: "GET",
data: values, //The data your sending to some-page.php
success: function (response) {
$('#loading-image').css('display', 'none');
$('#dropdownCondition').html(response);
filter();
},
error: function () {
console.log("AJAX request was a failure");
}
});
Goal: Call a server side method asynchronously from changing a dropdown to get data and populate a separate listbox not using UpdatePanels.
Currently I'm using a static ASP.NET page method asynchronously using jQuery and an ajax call as shown in this post (How to wire up a DropDownList to make AJAX calls to the server?) and it is working well.
The whole purpose was to prevent using the UpdatePanel tangled mess that I had been in previous years and this seems to be a good alternative. What I didn't realize is that the page method has to be static and you can not access any of the page's controls or context. So trying to make this call from a dropdown selection to populate another control's data is not possible. I can't see the other controls.
So what I'd like to do before I give up and go back to updatepanels is try to do 1 of the following:
Have my static page method return a json string with my collection data that I then use in the original jQuery method wired up to the change method of the dropdown to populate the separate listbox.
Same as above but return a .NET IList<> or comparable if returning json is not a good idea.
Point is I want that static method to return the needed data to bind to my listbox control. However I don't know how to do this. Here is my current jQuery method:
<script type="text/javascript">
$(document).ready(function () {
// Add the page method call as an onclick handler for the control.
$("<%= MyDDL.ClientID %>").click(function () {
$.ajax({
type: "POST",
url: "Default.aspx/MyDDL_SelectedIndexChanged",
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json"
});
});
});
</script>
Here is the original dropdown:
<asp:DropDownList ID="MyDDL" runat="server" Width="340px" />
Here is the control that needs populated based on the selection of the dropdown after calling the static method named MyDDL_SelectedIndexChanged:
<asp:ListBox ID="ListBox2" runat="server" Width="340px" SelectionMode="Multiple" />
Here is my current static page method:
[WebMethod]
public static string MyDDL_SelectedIndexChanged()
{
var myClass = new MyClass()
var data = myClass.GetDataCollection()
JavaScriptSerializer serializer = new JavaScriptSerializer();
string jsonString = serializer.Serialize(data);
}
Is there a way to take this returned data and bind it in the jQuery method above? My bailout is to go back to using an UpdatePanel where my server-side method can access other controls, but I really do not want to do this.
There is a javascript project called jsRender that may be what you need:
http://weblogs.asp.net/stevewellens/archive/2011/12/01/goodby-jquery-templates-hello-jsrender.aspx
I actually was looking for a more complete exaample and have the solution working with the code below:
$(document).ready(function () {
MyDDL_OnChangeHandler();
});
function MyDDL_OnChangeHandler() {
// Add the page method call as an change handler for the MyDDL DropDownList.
// This will call the static page method, and use the returned results to populate the 'MyListBox' listbox control.
$('#<%=MyDDL.ClientID %>').change(function () {
var val = $(this).val();
var text = $(this).children("option:selected").text();
var $lbxCtrl = $('#<%=MyListBox.ClientID %>');
$lbxCtrl.attr('disabled', 'disabled');
$lbxCtrl.empty();
$lbxCtrl.append('<option value="0">< Loading Please Wait... ></option>');
$.ajax({
type: "POST",
url: "Default.aspx/MyDDL_SelectedIndexChanged",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: "{'ID':'" + val + "', 'Name':'" + text + "'}",
success: function (data) {
$lbxCtrl.removeAttr('disabled');
$lbxCtrl.empty();
if (data.d == null) {
return;
}
$.each(data.d, function (i, data) {
$users.append('<option value="' + data.Value + '">' + data.FullName + ' (' + adUser.data+ ')' +'</option>');
});
},
error: function () {
$lbxCtrl.empty();
$lbxCtrl.append('<option value="0">< Error Loading Data ></option>');
alert('Failed to retrieve data.');
}
});
});
As Michael B mentioned in the comments, you can handle any data returned from the ajax call by using success:
<script type="text/javascript">
$(document).ready(function () {
// Add the page method call as an onclick handler for the control.
$("#<%= MyDDL.ClientID %>").click(function () {
$.ajax({
type: "POST",
url: "Default.aspx/MyDDL_SelectedIndexChanged",
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
// do stuff with the "data" that is returned
},
error: function(data) {
// handle any errors here
}
});
});
});
</script>
My Script to call ajax
<script language="javascript">
function search_func(value)
{
$.ajax({
type: "GET",
url: "sample.php",
data: {'search_keyword' : value},
dataType: "text",
success: function(msg){
//Receiving the result of search here
}
});
}
</script>
HTML
<input type="text" name="sample_search" id="sample_search" onkeyup="search_func(this.value);">
Question: while onkeyup I am using ajax to fetch the result. Once ajax result delay increases problem occurs for me.
For Example
While typing t keyword I receive ajax result and while typing te I receive ajax result
when ajax time delay between two keyup sometime makes a serious issue.
When I type te fastly. ajax search for t keyword come late, when compare to te. I don't know how to handle this type of cases.
Result
While typing te keyword fastly due to ajax delays. result for t keyword comes.
I believe I had explained up to reader knowledge.
You should check if the value has changed over time:
var searchRequest = null;
$(function () {
var minlength = 3;
$("#sample_search").keyup(function () {
var that = this,
value = $(this).val();
if (value.length >= minlength ) {
if (searchRequest != null)
searchRequest.abort();
searchRequest = $.ajax({
type: "GET",
url: "sample.php",
data: {
'search_keyword' : value
},
dataType: "text",
success: function(msg){
//we need to check if the value is the same
if (value==$(that).val()) {
//Receiving the result of search here
}
}
});
}
});
});
EDIT:
The searchRequest variable was added to prevent multiple unnecessary requests to the server.
Keep hold of the XMLHttpRequest object that $.ajax() returns and then on the next keyup, call .abort(). That should kill the previous ajax request and let you do the new one.
var req = null;
function search_func(value)
{
if (req != null) req.abort();
req = $.ajax({
type: "GET",
url: "sample.php",
data: {'search_keyword' : value},
dataType: "text",
success: function(msg){
//Receiving the result of search here
}
});
}
Try using the jQuery UI autocomplete. Saves you from many low-level coding.
First i will suggest that making a ajax call on every keyup is not good (and this why u run in this problem) .
Second if you want to use keyup then show a loading image after input box to show user its still loading (use loading image like you get on adding comment)
Couple of pointers. Firstly, language is a deprecated attribute of javascript. In HTML(5) you can leave the attribute off, or use type="text/javascript". Secondly, you are using jQuery so why do you have an inline function call when you can do that with jQuery too?
$(function(){
// Document is ready
$("#sample_search").keyup(function()
{
$.ajax({
type: "GET",
url: "sample.php",
data: {'search_keyword' : value},
dataType: "text",
success: function(msg)
{
//Receiving the result of search here
}
});
});
});
I would suggest leaving a little delay between the keyup event and calling an ajax function. What you could do is use setTimeout to check that the user has finished typing before then calling your ajax function.