How to get checkbox value in AJAX - javascript

I want to get the value of my checkbox in Ajax so that I can save it in database as a preference for each of my user. I've never done AJAX before so i'm quite lost about it.
My javascript file :
$(document).ready ->
E.accounts.changeUnmarkVisibility()
$('#letters-visibility').on 'click', (e) ->
E.accounts.changeUnmarkVisibility()
$('#label-letters-visibility').on 'click', (e) ->
if $('#letters-visibility').is(':checked')
$('#letters-visibility').prop('checked', false)
else
$('#letters-visibility').prop('checked', true)
E.accounts.changeUnmarkVisibility()
$('#letters-visibility').on 'change', (e) ->
$.ajax
url: "/backend/accounts/{#id}"
type: 'POST'
data:
isChecked: $('#letters-visibility').is(':checked')
success: (data, status, request) ->
console.log data
E.accounts =
changeUnmarkVisibility: ->
unmarkLines = $('.active-list .unmark').closest('tr')
if unmarkLines.is(':visible')
unmarkLines.hide()
else
unmarkLines.show()
)
My post request send me back a 404 error, I think the error is in my 'Data' option

Yeah Deckerz is right normally you have an ajax call which has a 'Data' option and then a success option. The data is an array/object of values that you want to send.
There are lots of options on the jquery ajax page and it's quite easy to get lost in them. This though is the norm. Done is called after some.php (in this case) has finished and msg has the data that is sent back from msg. Normally you'll want this in a json format. This is good practise for if you want to send back 2 variables. e.g Status (success/error) and ErrorMessage = ""
if you're using php json_encode is the function to use to achieve this.
$.ajax({
method: "POST",
url: "some.php",
data: { name: "John", location: "Boston" }
})
.done(function( msg ) {
alert( "Data Saved: " + msg );
});

I'm not sure I've understood where you're stuck at: it seems to me you've already read the checkbox's value without problems, so I'll assume you don't know what to do with the AJAX call.
The AJAX call is really just a request to your server: you probably want to call a script (pointed to by the URL you pass), with the parameters you need to identify the user and the option, that writes the checkbox's value to the database.
One thing that may be useful to know: you don't need to construct a query string to pass your parameters along with a GET request, you can just pass them in the data parameter of the jQuery.ajax call as a regular JSON object.

AJAX doesn't do that. AJAX returns the value. And then you look at the value to decide what to check. If you are doing this in jquery, then look here: https://api.jquery.com/checked-selector/

Related

AJAX call how to retrieve my javascript variable

I work with Rails 4 and basically I am searching a value on my html webpage traversing the DOM with jquery.
I store the value in a variable named key and I want to use this value to then make a request that would look like this :
Record.find(id: key).name
I perform an AJAX call and it works well (I checked it rendering status json ok). But now how can I use/retrieve the parameter key in my controller ?
I have a User and a Record model. In the app/views/usersdirectory I have the partial _form.html.erb in which I am doing some javascript.
var key = $('input#record_id').val();
And I want this variable to be available in the method search of my user controller, so that I can make a request with the parameter key.
So I am doing an AJAX call that looks like this :
$.ajax({
url: "/search",
type: "POST",
data: {
value: key
},
complete: function(){
console.log('success');
}
});
And in my config routes file I wrote this route :
post '/search' => 'users#search'
In my User controller I wrote the method like this :
def search
#record = Record.find(params[:key])
end
Is #record available in my partial ? How can I print in my view the result of my request ?
Can anyone tell me if I am doing right or wrong for my AJAX call ? Thanks for any help. If I forgot to mention any information you might need tell me and I'll edit my post.
I added a complete function in my AJAX call, that is supposed to show successif the AJAX call had been done and in my console log I have this message 'success' that appears
For 404 not found the url must be wrong.
And to get the param key in your controller you must change data to data: {key: key} or if you use data: {value: key} then your action must change the name of the param like #record = Record.find(params[:level])
Basically, you are not using the right param name in your controller which is why the issue arises. Hope it helps.
To answer your second question:
#GDMN, you need to get your basics right! Every ajax has a success and failure callback.You could return json from your action which will be used by success callback and you could do whatever you want from there. Essentially in rails you might want to render a js file like this
Create a file named search.js.erb and use your javascript code in it like below
$('.some_id_or_class').html("<%= #record.name %>")
that will simply replace the element of that class with the value that is returned by #record.name
put the full url
url: "http://yoursite.domain/search",

PHP, Javascript, Ajax and the aspect of getting a result

I have a php file with a lot of checkboxes on the left hand side. I extract the values via javscript and pass them into an array. Which works just fine. I would like to pass then this array via Ajax to PHP in order to mess around with the values and create SQL-statements out of them.
$(document).ready(function(e) {
$('#getSelectedValues').click(function() {
var chkBoxArray = [];
$('.graphselectors:checked').each(function() {
chkBoxArray.push($(this).val());
});
for (var i = 0; i < chkBoxArray.length; i++) {
console.log(i + " = " + chkBoxArray[i]);
}
$.ajax({
url: 'index.php', // (1)
type: 'POST',
dataType:'json',
data: chkBoxArray, //(2)
success: function(data){
console.log(data.length);
console.log(data);
}
});
});
});
Several questions:
(1) what file name do I need to add here? The origion or the target?
(2) I have numerous ways of this: serialization, with these brackets {}, and so on. How to get it done right?
An error that I get is the following:
Notice: Undefined index: data in graph.php
That makes me wondering a bit, because it clearly shows no data is being send.
var_dumps on $_POST and $_SERVER offer these results:
array(0) { }
array(0) { }
which is somewhat unsatisfying.
Where am I doing things wrong? The only puzzling aspect is the ajax, all other stuff is not much of an issue.
The site is supposed to work in the following way:
Page -> Checkbox(clicked) -> Button -> result (ajax) -> PHP fetches result -> SQL DB -> PHP gets DB result -> fetch result (ajax) -> jslibrary uses result for something.
1- You need to point your ajax to the script that will use the data you are sending. I would not recommend to point to index.php, since you'll need to add a if statement checking if there is data on $_POST that is exactly what your're expecting, otherwise it will return the same page that you're in (considering that you are in index.php and is making a request to index.php). A point to consider. Since it is a whole request and it's not a method call to actually return something to your page you need to echo things. That said, consider also to set header('Content-Type: application/json') then, since you're expecting dataType: 'json', echo json_encode($objectorarray);
2- Since you're sending a Javascript array to PHP, it can't interpret correctly the structure, that is why you should use JSON.stringify(chkBoxArray) before sending it. But just setting it on data attribute would send the number of checkboxes you selected as values to POST, so consider to data: {myCheckboxValues: JSON.stringify(chkBoxArray)}
In your PHP script, considering all the security measures to take, you can $foo = json_decode($_POST['myCheckboxValues']);
Well, of course you need to pass the target page as url in your ajax call. It can't guess which file should process the data.
As for the data property. You need to give your data a name.
data: {
something: "something"
}
Becomes: $_POST['something']. (value: something)
$.ajax({
url: 'target.php', // (1)
type: 'POST',
dataType:'json',
data: { data: chkBoxArray }, //(2) Now $_POST['data'] will work
success: function(data){
console.log(data.length);
console.log(data);
}
});

jQuery AJAX reload specific div

I have the following code, as part of a code to add some value to a database.
After executing the $.ajax succesfully, I want a specific div (with class 'lijst') to be reloaded with the refreshed data.
$.ajax({
url: \"frontend/inc/functions/add_selectie.php\",
type: \"POST\",
data: ({ 'p_id' : p_id, 'v_id' : v_id, 'pd_id' : pd_id }),
cache: false,
success: function()
{
$(\".lijst\").hide().fadeIn('slow');
}
});
However, with this solution, only the div is refreshed, not the actual PHP variables that are specified in there. When I refresh my browser manually, the values are updated.
How can I refresh the div and also update the variables?
According to the jQuery.ajax documentation, the function signature of "success".
Type: Function( PlainObject data, String textStatus, jqXHR
jqXHR ) A function to be called if the request succeeds. The function
gets passed three arguments: The data returned from the server ...
So in other words:
success: function(data) {
$(".lijst").html(data).hide().fadeIn('slow');
}
Actually, the PHP variables specified in the html are worked at the sever part. PHP variables in the html have replaced by the string of there value when it is ready to be sent to the browser. And your ajax request will cause PHP to update database. So when you have sent the request and then refresh the page, PHP will replace the varables in the html again.
According to this above, your ajax request and the server repsonse are not aware of the PHP variables's existence. So you must update the content yourself.
Maybe you will do something like this:
success: function(data) {
$(".lijst").hide();
$(".title").html(data.title); // $(".title") may be a tag that surround a PHP variable
$(".content").html(data.content); // the same as $(".title")
$(".lijst").fadeIn('slow');
}

Passing array through ajax

I'm fairly new to the jQuery execute on the same page stuff. So far I have been passing only single values trough ajax which is working fine. Now, I need to pass an array which is created by checkboxes through ajax.
My form html, dynamically created by php:
<input type=checkbox class=box name=box[] value=".$row['DoosID']." />
My jQuery:
var BackorderDate = $("#BackorderDate").val();
var Box = $(".box").val();
if( (TerugleverDatum == "") ){
$("#backorderresult").html(" * Some Error .").fadeIn("Slow").fadeOut(3000);
} else {
$("#backorderresult").fadeOut();
$.ajax({
type :'POST',
url :'./backorder.php',
data : box : Box,
backorderdate: BackorderDate,
dataType:"json",
success: function(data){
// Do Something
}
});
}
My PHP:
$boxlist = json_encode($box);
foreach($boxlist as $boxvalue){
// Do something with every value
}
this gives me a javascript error on submit saying box is not defined.
change this:
data : box : Box, backorderdate: BackorderDate, // invalid way of sending
to this:
data : {box : Box, backorderdate: BackorderDate}, // valid way
data
Type: PlainObject or String
Data to be sent to the server. It is converted to a query string, if not already a string. It's appended to the url for GET-requests. See processData option to prevent this automatic processing. Object must be Key/Value pairs.
More Info
Why don't you try enclosing all the data values in a open and close curly braze( { and } ) .
Else it will conflict with the syntax of $.ajax method.
I think it is causing the problem.
You are sending data value in wrongly manner -
The data property should always be a JavaScript object. It's properties are serialized into a regular query string (for GET requests), or a normal post body parameter string (for POST requests). This serialized string is then sent to the server, along with the AJAX request.
On the server you can read the properties of the data object as if they were sent as simple request parameters, via either GET or POST. Just like if the properties had been fields in a form.
Try this :
$.ajax({
type :'POST',
url :'./backorder.php',
data : 'box='+Box+'&backorderdate='+BackorderDate,
dataType:"json",
success: function(data){
// Do Something
}
});
For more information see jQuery Ajax
You might want to refer to the php file like this: url :'../backorder.php' (double dots). At least, that's how I do it always.

which method of jquery ajax should I use?

I want to send a very long string to a servlet. Could be more than 10,000 characters.
I want to know which jquery ajax/ or any way to send it to the servlet.
I have used $.post and faced characters limit problems.
sending long strings in jquery post
using $.post has character limits?
Did you send the string as part of the URL (GET) or did you send the string as part of the POST body?
Use this to send it as POST:
$.post(url, {longString: veryLongString}, function(){});
$.post is just an alias for $.ajax (with the method param preset) => it won't make any difference which of these methods you will use.
In case there is any doubt left in your mind here:
function ajaxTest () {
var longstr = "qwertyuiopasdfghjklzxcvbnm";
while (true) {
longstr += longstr;
if (longstr.length > 100000) {
break;
}
}
console.log(longstr.length);
$.ajax({
url: '/ajax',
type: 'post',
data: longstr,
processData: false,
success: function (reply) {
console.log(reply);
}
});
}
I set the server up to reply with "ok" + the length of the post data received. The first console log reports "106496", the second one "ok 106496".
There is no client side limit (eg, imposed by jquery) to how much data you can send via post.
As far as I know there are no character limitations on a POST request. GET has limitations, but I cant recall any on POST operations.
In the above links (the ones you made reference to):
$.post(
"TestServletAsh?xml="+str,
function(data) {
alert("mission successfull"); //nothing to do with it or data here in this SO question
}
);
sends the variable 'str' as a get parameter.
The way to send data to a POST request using jquery is
$.post(url, {data:'whatever you want blah blah blah'}, function(data){});
there is no limit in post, check your js code, you have some mistake or using the get method instead of post

Categories

Resources