First of all, I have never successfully built an AJAX call that worked. This is my first real try at doing this.
I am working on building a function to update existing records in a SQL database. I am using ASP.NET Core (.NET 6) MVC but I also use JavaScript and jQuery. I cannot have the page refresh, so I need to use ajax to contact the Controller and update the records.
I have an array that was converted from a NodeList. When I debug step by step, the collectionsArray looks perfectly fine and has data in it.
//Create array based on the collections list
const collectionsArray = Array.from(collectionList);
$.ajax({
method: 'POST',
url: '/Collections/UpdateCollectionSortOrder',
data: collectionsArray,
})
.done(function (msg) {
alert('Sent');
});
However, when I run the application and debug the code, the array is received in the Controller as {string[0]}.
Here is the method which is in the Controller, with my mouse hovered over the parameter:
Do not pay attention to the rest of the code in the controller method. I have not really written anything in there of importance yet. I plan to do that once the data is correctly transferred to the Controller.
I have tried dozens of ideas including what you see in the Controller with the serialize function, just to see if it processes the junk data that is getting passed, but it hasn't made a difference.
I have been Googling the issue & reading other StackOverflow posts. I've tried things like adding/changing contentType, dataType, adding 'traditional: true', using JSON.stringify, putting 'data: { collections: collectionsArray }' in a dozen different formats. I tried processing it as a GET instead of POST, I tried using params.
I am out of ideas. Things that have worked for others are not working for me. What am I doing wrong? I'm sure it's something minor.
UPDATE: Here is the code which explains what the collectionList object is:
//Re-assign SortID's via each row's ID value
var collectionList = document.querySelectorAll(".collection-row");
for (var i = 1; i <= collectionList.length; i++) {
collectionList[i - 1].setAttribute('id', i);
}
What I am doing is getting a list off the screen and then re-assigning the ID value, because the point of this screen is to change the sort order of the list. So I'm using the ID field to update the sort order, and then I plan to pass the new IDs and names to the DB, once I can get the array to pass through.
UPDATE: SOLVED!
I want to post this follow up in case anyone else runs into a similar issue.
Thanks to #freedomn-m for their guidance!
So I took the NodeList object (collectionList) and converted it to a 2-dimensional array, pulling out only the fields I need, and then I passed that array onto the controller. My previous efforts were causing me to push all sorts of junk that was not being understood by the system.
//Create a 2-dimensional array based on the collections list
const collectionArray = [];
for (var i = 0; i < collectionList.length; i++) {
collectionArray.push([collectionList[i].id, collectionList[i].children[1].innerHTML]);
}
$.ajax({
method: 'POST',
url: '/Collections/UpdateCollectionSortOrder',
data: { collections: collectionArray }
})
.done(function (msg) {
alert('Sent');
});
2-d array is coming through to the Controller successfully
Related
I have an ajax call to a PHP module which returns some HTML. I want to examine this HTML and extract the data from some custom attributes before considering whether to upload the HTML into the DOM.
I can see the data from the network activity as well as via console.log. I want to extract the values for the data-pk attribute and test them before deciding whether to upload the HTML or just bypass it.
$.ajax({
url: "./modules/get_recent.php",
method: "POST",
data: {chat_id:chat_id, chat_name:chat_name, host_id:host_id, host_name:host_name}, // received as a $_POST array
success: function(data)
{
console.log(data);
},
})
and some of the console log data are:
class="the_pks" data-pk="11"
class="the_pks" data-pk="10"
etc.
In the above data I want to extract and 'have a look at' the numbers 11 and 10.
I just do not know how to extract these data-pk values from the returned data from the ajax call. Doing an each on class 'the_pks' does not work as at the time I am looking at the data they have not been loaded into the DOM.
I have searched SO for this but have not come up with an answer.
Any advice will be most appreciated.
I hope I understand your question.
If you get a HTML as a response, you can always create an element and insert that html inside it, without adding it to the DOM. And after that you can search it as you do with a DOM element.
const node = document.createElement("div");
//then you can do
node.appendChild(data);
// or
node.innerHTML = data;
And after that you can search inside the node:
node.querySelectorAll("[data-pk]")
I will re-engineer this - it was probably a clumsy way to try and achieve what I wanted anyway. Thanks to those who tried to help.
So, currently I am passing values stored in Database MySQL to View (using Controller). I do simple querying ModelName::where()->first();.
I have my data right now in View. I want to use that data in Ajax or Javascript code that I am writing.
I can have 46 values and one way to do this is to have <div id="field1"></div> for 46 times set div style to display:none in css and in Javascript use document.getElementById('field1'); to access the values and finally, do whatever I want to do with it.
But I find this quite long and un-necessary to do as there is no point of printing all the values in html first and then accessing it. How can I directly get {{$data}} in Javascript?
myCode
public function index(Request $request){
$cattfs = Cattf::all();
$cattts = Cattt::all();
$cattos = Catto::all();
return view('/index',compact('cattfs'));
}
View
Nothing in the view. and I prefer it to be none.
Javascript and Ajax
$(document).ready(function()
{
init();
});
function init(){
my_Date = new Date();
var feedback = $.ajax({
url:url,
dataType: "JSON",
type: "GET",
}).success(function(data){
console.log(data);
//I have some data called data from url
//I want some data from controller like: cattf,cattt,catto
//I will combine url data and cattf and do simple arithmetic to it
//finally output to the view.
}).responseText;
}
One good way would be to actually make a small API to get your data. Let's say you wanted to retrieve users.
In the api.php file in your route folder:
Route::get('/posts', function () {
return Post::all();
});
and then you just need to use http://yourUrl.dev/api/posts as your URL sent in your .ajax() call to work with what you need.
I found best solution use this: https://github.com/laracasts/PHP-Vars-To-Js-Transformer
It takes values from controller directly to Javascript.
I have an HTML form that I am trying to convert to submitting using the Jquery load() function. I have it working for a single field, but I have spent hours trying to get it to work for multiple fields, including some checkboxes.
I have looked at many examples and there seems to be about three of four ways of approaching this:
Jquery .load()
jquery .ajax()
jquery .submit()
and some others. I am not sure what the merits of each approach is but the first example I was following used the .load(), so that is what I have persisted with. The overall object is to submit some search criterion and return the database search results.
What I have at present:
<code>
// react to click on Search Button
$("#SearchButt").click(function(e){
var Options = '\"'+$("#SearchText").val()+'\"' ;
var TitleChk = $("#TitleChk").prop('checked');
if (TitleChk) Options += ', \"TitleChk\": \"1\"';
// load returned data into results element
$("#results").load("search.php", {'SearchText': Options});
return false; //prevent going to href link
});
</code>
What I get is the second parameter appended to the first.
Is there a way to get each parameter sent as a separate POST item or do I have to pull it apart at the PHP end?
It would seem as if you're stumbling over the wrapper, let's go ahead and just use the raw $.ajax() and this will become more clear.
$("#SearchButt").click(function(e){
var Options = {};
Options.text = $('#SearchText').val();
Options.title = $('#Titlechk').prop('checked')) ? 1: 0; //ternary with a default of 0
$.ajax({
url: 'search.php',
type: 'POST',
data: Options
}).done(function(data){
$('#results').html(data); //inject the result container with the server response HTML.
});
return false;
});
Now in the server side, we know that the $_POST has been populated with 2 key value pairs, which are text and title respectively.
I'm trying to create a note taking web app that will simply store notes client side using HTML5 local storage. I think JSON is the way to do it but unsure how to go about it.
I have a simple form set up with a Title and textarea. Is there a way I can submit the form and store the details entered with several "notes" then list them back?
I'm new to Javascript and JSON so any help would be appreciated.
there are many ways to use json.
1> u can create a funciton on HTML page and call ajax & post data.
here you have to use $("#txtboxid").val(). get value and post it.
2> use knock out js to bind two way.and call ajax.
here is simple code to call web app. using ajax call.
var params = { "clientID": $("#txtboxid") };
$.ajax({
type: "POST",
url: "http:localhost/Services/LogisticsAppSuite.svc/Json/GetAllLevelSubClients",
contentType: 'application/json',
data: JSON.stringify(params),
dataType: 'json',
async: false,
cache: false,
success: function (response) {
},
error: function (ErrorResponse) {
}
I have written a lib that works just like entity framework. I WILL put it here later, you can follow me there or contact me to get the source code now. Then you can write js code like:
var DemoDbContext = function(){ // define your db
nova.data.DbContext.call(this);
this.notes=new nova.data.Repository(...); // define your table
}
//todo: make DemoDbContext implement nova.data.DbContext
var Notes = function(){
this.id=0; this.name="";
}
//todo: make Note implement nova.data.Entity
How to query data?
var notes = new DemoDbContext().notes.toArray(function(data){});
How to add a note to db?
var db = new DemoDbContext();
db.notes.add(new Note(...));
db.saveChanges(callback);
Depending on the complexity of the information you want to store you may not need JSON.
You can use the setItem() method of localStorage in HTML5 to save a key/value pair on the client-side. You can only store string values with this method but if your notes don't have too complicated a structure, this would probably be the easiest way. Assuming this was some HTML you were using:
<input type="text" id="title"></input>
<textarea id="notes"></textarea>
You could use this simple Javascript code to store the information:
// on trigger (e.g. clicking a save button, or pressing a key)
localStorage.setItem('title', document.getElementById('title').value);
localStorage.setItem('textarea', document.getElementById('notes').value);
You would use localStorage.getItem() to retrieve the values.
Here is a simple JSFiddle I created to show you how the methods work (though not using the exact same code as above; this one relies on a keyup event).
The only reason you might want to use JSON, that I can see, is if you needed a structure with depth to your notes. For example you might want to attach notes with information like the date they were written and put them in a structure like this:
{
'title': {
'text':
'date':
}
'notes': {
'text':
'date':
}
}
That would be JSON. But bear in mind that the localStorage.setItem() method only accepts string values, you would need to turn the object into a string to do that and then convert it back when retrieving it with localStorage.getItem(). The methods JSON.stringify will do the object-to-string transformation and JSON.parse will do the reverse. But as I say this conversion means extra code and is only really worth it if your notes need to be that complicated.
I have an ExtJS based application. When editing an object, an ExtJS window appears with a number of tabs. Three of these tabs have Ext GridPanels, each showing a different type of data. Currently each GridPanel has it's own JsonStore, meaning four total AJAX requests to the server -- one for the javascript to create the window, and one for each of the JsonStores. Is there any way all three JsonStores could read from one AJAX call? I can easily combine all the JSON data, each one currently has a different root property.
Edit: This is Ext 2.2, not Ext 3.
The javascript object created from the JSON response is available in yourStore.reader.jsonData when the store's load event is fired. For example:
yourStore.on('load', function(firstStore) {
var data = firstStore.reader.jsonData;
otherStore.loadData(data);
thirdStore.loadData(data);
}
EDIT:
To clarify, each store would need a separate root property (which you are already doing) so they'd each get the data intended.
{
"firstRoot": [...],
"secondRoot": [...],
"thirdRoot": [...]
}
You could get the JSON directly with an AjaxRequest, and then pass it to the loadData() method of each JSONStore.
You may be able to do this using Ext.Direct, where you can make multiple requests during a single connection.
Maybe HTTP caching can help you out. Combine your json data, make sure your JsonStores are using GET, and watch Firebug to be sure the 2nd and 3rd requests are not going to the server. You may need to set a far-future expires header in that json response, which may be no good if you expect that data to change often.
Another fantastic way is to use Ext.Data.Connection() as shown below :
var conn = new Ext.data.Connection();
conn.request({
url: '/myserver/allInOneAjaxCall',
method: 'POST',
params: {
// if you wish too
},
success: function(responseObj) {
var json = Ext.decode(responseObj.responseText);
yourStore1.loadData(json.dataForStore1);
yourStore2.loadData(json.dataForStore2);
},
failure: function(responseObj) {
var message = Ext.decode(responseObj.responseText).message;
alert(message);
}
});
It worked for me.