I'm just trying to load the data for a select2 dropdown using Ajax, instead of putting the large dataset inline in my HTML.
$('input[name="field"]').select2({
ajax: {
url: "/data.json",
dataType: "json",
results: function(data,page)
{
return data;
}
}
});
This works, in that it waits until I "open" my select2 list before making the Ajax call to get the data. It then also displays the data correctly. However, it isn't filtering the list as I type. Instead, it makes repeated ajax calls to (presumably) get the filtered data.
Also, if I set an existing value in my form, it doesn't appear in my select2 control. I'm guessing this is because I'm not using initSelection but I'm not clear on how to do this correctly.
Am I doing this all wrong? It appears that what I really want is the functionality of data but with remote loading.
I don't think this is ideal, but it works:
$.get("/data.json", function(data)
{
$('input[name="field"]').select2({
data: data,
});
});
Related
After using table.destroy() method my table rows are still displayed, only the search box and other borders of datatable are not displayed.
I want to delete all the rows in the datatable, basically i want to delete the whole datatable so that i can reinitialize it.
Thank you
When you use the destroy() method you are effectively returning the table back to its original state. The HTML for the table is still present on the page hence why you can still see the table rows, without the added DataTables functionality.
If you want to remove the data rows from your DataTable, you may want to look at the clear() method, for example:
table.clear();
I have set up a jsfiddle which demonstrates these options.
If you can provide your code I should be able to give you a more accurate answer.
In case someone else finds this thread, I had the same issue when trying to replace a datatable with an ajax call. Calling destroy and then reinitializing the datatable after the ajax response worked for me with no errors. documentation
$('#myTrigger').click(function(e){
e.preventDefault();
table.destroy();
$.ajax({
type: 'post',
url: 'processor.php',
data: $('#myform').serialize(),
success: function (response) {
var table = $('#myTable').DataTable({
"pageLength": 25
});
}
});
});
I need to display a number of "dynamic" grids using jqGrid. By dynamic I mean that both definition and data of the grid are retrieved from a database. There are many grids on the page, so I am trying to minimize the number of server trips, and there is a lot of data, so server-side paging is a must.
My workflow is
On initialization of each grid, retrieve grid definition and first
page of data in one server call.
If a user sorts/pages, then retrieve a page of data from the server
Because I want to retrieve the grid definition and first page of data in one call, I cannot use datatype: 'json', url: '###' approach; instead I do:
grid.jqGrid({
mtype: 'post',
...
datatype: function (postdata) {
if (!init.data) {
var request = {
screenId: settings.screenId,
pageNumber: postdata.page,
pageSize: postdata.rows,
sortColumn: postdata.sidx,
sortDirection: postdata.sortd,
date: settings.date
};
site.callWs("/MyService", request, function (pageResponse) {
//WHAT TO CALL HERE TO SET A PAGE OF DATA?
});
} else {
//WHAT TO CALL HERE TO SET A PAGE OF DATA?
init.data = null;
}
}
});
My data object (pageResponse or init.data) looks like this
I am not sure what method to call on jqGrid once a page of data is returned. I considered addJSONData, but it seems so inefficient to convert JSON back to string, then use EVAL(). Also, considered addRowData or setting the data property, but I am confused how to instruct jqGrid that I am doing server-side paging -- if I set the data property to one page of records, what do I need to do to tell jqGrid that there is a total of 50 records and this is page 1 out of 10.
Thanks for your help.
It was a user error (mine :). I had some show/hide logic in loadComplete of jqGrid, but this event does not fire when addJSONData is called.
addJSONData works just fine when provided with a properly-structured JavaScript object.
I'm using jQuery UI. I'm loading some content in a dialog box over AJAX. After inserting the content from the server, I need to make modifications to the document. I am using the .live() function on my link; I thought this would enable me to use Js after loading the content over ajax, but it's like the content I just loaded isn't a part of the document. Any help very much appreciated.
Are you adding the bindings (lives) in the success function of the ajax call?
If so I had the same issue, I'll try to explain what I figured out:
$.post('callURL', function(data){
// Let's say data returned from server is an ID of a div I have to hide
// by clicking on some_link
$('#some_link').live('click',function(){
$('#'+data).hide();
});
});
This won't work because the code inside the 'live' function is executed on click and at that time the 'data' value is gone.
To make it work I made a global variable 'ID' which I set in the success function and then called in the 'live' function again like this:
var ID;
$.post('callURL', function(data){
// Let's say data returned from server is an ID of a div I have to hide
// by clicking on some_link
ID = data
$('#some_link').live('click',function(){
$('#'+ID).hide();
});
});
I have a Generic list in my Model class. I want to have a textbox with autocomplete in my view which fills data from the generic list. How can I do this?.
For this you will need
Function on server side which will return list of matching data and will accept string entered by the user.
Something like this
public JsonResult AutoComplete(string input)
{
//Your code goes here
}
In the View, for the text box you need to bind KeyDown event. You can take help of jQuery for this. On key down handler you will make an Ajax call to the function you have defined in the Controller. Some thing like this:
$.ajax({
url: '#Url.Action("AutoComplete", "ControllerName")',
data: 'input=' + sampleInput,
success: function (data) {
//Show the UL drop down
},
error: function (data) {
// Show Error
}
});
In response you will get list of strings, which you will need to bind to some html element like "UI". Once done, display this UI with proper CSS below the text box. Using jQuery, you can retrieve the pixel location of text box too.
You can not use Asp.Net Auto Complete box in your project as you are developing app in MVC (no viewstate). I hope you get the idea.
You can use JQuery Autocomplate.
To fill the list, you can populate the data from you object.
I can't remember the exact Razor syntax, but you can refer to this:
//data is your Model object of type List<String>
var listString = [#foreach(x in data) { '#x',}];
$( "#dataList" ).autocomplete({
source: listString
});
<input id="dataList">
JQuery Autocomplte
http://jqueryui.com/demos/autocomplete/
This is client side auto complete, I can provide server side if you need.
Given so much different options to submit sth to the server, I feel a little confused.
Can someone help me to clear the idea when I should use which and why?
1> $.ajax()
2> $('#myForm').ajaxForm
3> ajaxSubmit
4> $('#myForm').submit
Thank you
I personally prefer creating a function such as submitForm(url,data) that way it can be reused.
Javascript:
function submitForm(t_url,t_data) {
$.ajax({
type: 'POST',
url: t_url,
data: t_data,
success: function(data) {
$('#responseArea').html(data);
}
});
}
HTML:
<form action='javascript: submitForm("whatever.php",$("#whatevervalue").val());' method='POST'> etc etc
edit try this then:
$('#yourForm').submit(function() {
var yourValues = {};
$.each($('#yourForm').serializeArray(), function(i, field) {
yourValues[field.name] = field.value;
});
submitForm('whatever.php',yourvalues);
});
Here is my understanding
$.ajax does the nice ajax way to send data to server without whole page reload and refresh. epically you want to refresh the segment on the page. But it has it's own limitation, it doesn't support file upload. so if you don't have any fileupload, this works OK.
$("#form").submit is the javascript way to submit the form and has same behaviour as the input with "submit" type, but you can do some nice js validation check before you submit, which means you can prevent the submit if client validation failed.
ajaxForm and ajaxSubmit basically are same and does the normal way form submit behaviour with some ajax response. The different between these two has been specified on their website, under FAQ section. I just quote it for some lazy people
What is the difference between ajaxForm and ajaxSubmit?
There are two main differences between these methods:
ajaxSubmit submits the form, ajaxForm does not. When you invoke ajaxSubmit it immediately serializes the form data and sends it to the server. When you invoke ajaxForm it adds the necessary event listeners to the form so that it can detect when the form is submitted by the user. When this occurs ajaxSubmit is called for you.
When using ajaxForm the submitted data will include the name and value of the submitting element (or its click coordinates if the submitting element is an image).
A bit late, but here's my contribution. In my experience, $.ajax is the preferred way to send an AJAX call, including forms, to the server. It has a plethora more options. In order to perform the validation which #vincent mentioned, I add a normal submit button to the form, then bind to $(document).on("submit", "#myForm", .... In that, I prevent the default submit action (e.preventDefault() assuming your event is e), do my validation, and then submit.
A simplified version of this would be as follows:
$(document).on("submit", "#login-form", function(e) {
e.preventDefault(); // don't actually submit
// show applicable progress indicators
$("#login-submit-wrapper").addClass("hide");
$("#login-progress-wrapper").removeClass("hide");
// simple validation of username to avoid extra server calls
if (!new RegExp(/^([A-Za-z0-9._-]){2,64}$/).test($("#login-username").val())) {
// if it is invalid, mark the input and revert submit progress bar
markInputInvalid($("#login-username"), "Invalid Username");
$("#login-submit-wrapper").removeClass("hide");
$("#login-progress-wrapper").addClass("hide");
return false;
}
// additional check could go here
// i like FormData as I can submit files using it. However, a standard {} Object would work
var data = new FormData();
data.append("username", $("#login-username").val());
data.append("password", $("#login-password").val()); // just some examples
data.append("captcha", grecaptcha.getResponse());
$.ajax("handler.php", {
data: data,
processData: false, // prevent weird bugs when submitting files with FormData, optional for normal forms
contentType: false,
method: "POST"
}).done(function(response) {
// do something like redirect, display success, etc
}).fail(function(response) {
var data = JSON.parse(response.responseText); // parse server error
switch (data.error_code) { // do something based on that
case 1:
markInputInvalid($("#login-username"), data.message);
return;
break;
case 2:
markInputInvalid($("#login-password"), data.message);
return;
break;
default:
alert(data.message);
return;
break;
}
}).always(function() { // ALWAYS revert the form to old state, fail or success. .always has the benefit of running, even if .fail throws an error itself (bad JSON parse?)
$("#login-submit-wrapper").removeClass("hide");
$("#login-progress-wrapper").addClass("hide");
});
});