JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements
HtmlAjaxJqueryHtml Problem Overview
I have two select elements, A and B: when A's selected option changes, B's options must be updated accordingly. Each element in A implies many elements in B, it's a one-to-many relationship (A contains nations, B should contain cities located in the given nation).
The function do_ajax
should run the asynchronous request:
function do_ajax(elem, mydata, filename)
{
$.ajax({
url: filename,
context: elem,
data: mydata,
datatype: "html",
success: function (data, textStatus, xhr) {
elem.innerHTML = data;
}
});
}
In order to update B's options I've added a function call in A's onChange
event. Here is the function that runs when onChange event (of A
) is triggered:
function my_onchange(e) // "e" is element "A"
{
var sel_B = ... ; // get select element "B"
// I skipped some code here
// ...
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
do_ajax(city_sel, data, 'ajax_handler.php');
}
}
I've read in JQuery docs that data
can be an array (key value pairs). I get the error if I put:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
Instead, I don't get that error if my data is a string:
var data = 'mode=filter_city&id_A=' + e[e.selectedIndex];
But I need the "array version" of the variable, in my server-side php code.
The Uncaught TypeError: Illegal invocation
is located in the "jquery-1.7.2.min.js" file, which is all compressed, so I couldn't figure out what part of code raised the error.
Is there any setting I can change in my code so that it accepts data as an associative array?
Html Solutions
Solution 1 - Html
Thanks to the talk with Sarfraz we could figure out the solution.
The problem was that I was passing an HTML element instead of its value, which is actually what I wanted to do (in fact in my php code I need that value as a foreign key for querying my cities
table and filter correct entries).
So, instead of:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
it should be:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex].value
};
Note: check Jason Kulatunga's answer, it quotes JQuery doc to explain why passing an HTML element was causing troubles.
Solution 2 - Html
I was getting this error while posting a FormData object because I was not setting up the ajax call correctly. Setup below fixed my issue.
var myformData = new FormData();
myformData.append('leadid', $("#leadid").val());
myformData.append('date', $(this).val());
myformData.append('time', $(e.target).prev().val());
$.ajax({
method: 'post',
processData: false,
contentType: false,
cache: false,
data: myformData,
enctype: 'multipart/form-data',
url: 'include/ajax.php',
success: function (response) {
$("#subform").html(response).delay(4000).hide(1);
}
});
Solution 3 - Html
From the jQuery docs for processData
:
> processData Boolean
> Default: true
> By default, data passed in to the data option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type "application/x-www-form-urlencoded". If you want to send a DOMDocument, or other non-processed data, set this option to false.
Source: http://api.jquery.com/jquery.ajax
Looks like you are going to have to use processData
to send your data to the server, or modify your php script to support querystring encoded parameters.
Solution 4 - Html
> I've read in JQuery docs that data can be an array (key value pairs). > I get the error if I put:
This is object not an array:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
You probably want:
var data = [{
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
}];
Solution 5 - Html
Had the same issue recently, solved by adding traditional: true,
Solution 6 - Html
Please follow the procedure to get rid of this problem:
$.ajax({
url: 'https://your-api-endpoint',
type: 'post',
data: new formData(this),
processData: false,
contentType: false,
success: function(response) {
console.log(response)
}
})
You have to use processData: false and contentType: false, these two lines. Your problem will be solved.
Solution 7 - Html
function do_ajax(elem, mydata, filename)
{
$.ajax({
url: filename,
context: elem,
data: mydata,
**contentType: false,
processData: false**
datatype: "html",
success: function (data, textStatus, xhr) {
elem.innerHTML = data;
}
});
}
Solution 8 - Html
My illegal invocation
error on $.getJSON
was caused by passing undefined
as one of the values for the data
object. Fixing that solved the error.
Solution 9 - Html
$.ajax({
url:"",
type: "POST",
data: new FormData($('#uploadDatabaseForm')[0]),
contentType:false,
cache: false,
processData:false,
success:function (msg) {}
});
Solution 10 - Html
Try This:
$.ajax({
url:"",
type: "POST",
data: new FormData($('#uploadDatabaseForm')[0]),
contentType:false,
cache: false,
processData:false,
success:function (msg) {}
});