I'm dealing with how to send successful response to jquery's iframe post form plugin.
With the help of the source code of the plugin's demonstration, I can see that there is the following code below: (Click here for source)
complete : function (response)
{
var style,
width,
html = '';
if (!response.success)
// I've always came to this block! And that is exactly the problem that I have
{
$('.message').slideUp(function ()
{
$(this)
.html('There was a problem with the image you uploaded')
.css({
color : '#9c0006',
background : '#ffc7ce',
borderColor : '#9c0006'
})
.slideDown();
});
}
else /***** When is the response successful and when will code come here? *****/
{
/*
following code goes here...
*/
}
}
The exact question is that when do the response.success will be TRUE? And how should I set it to TRUE with PHP? (Please answer both with and without JSON style)
when you run ajax and communicate with php. youre going to grab whatever php echoes out and use that. in this case its probably wisest to use json encode. heres a very basic example to give you an idea.
a php file:
echo json_encode(array('success' => true));
now a basic ajax request
$.ajax({url:"ajax.php",success:function(result){
result = $.parseJSON(result); // we do this to convert the php into javascript format
if(result.success){
alert('this is true');
}
}});
Related
I am very new to PHP and Javascript.
Now I am running a PHP Script by using but it redirect to another page.
the code is
<a name='update_status' target='_top'
href='updateRCstatus.php?rxdtime=".$time."&txid=".$txid."&balance=".$balance."&ref=".$ref."'>Update</a>
How do I execute this code without redirecting to another page and get a popup of success and fail alert message.
My script code is -
<?PHP
$rxdtime=$_GET["rxdtime"];
$txid=$_GET["txid"];
$balance=$_GET["balance"];
$ref=$_GET["ref"];
-------- SQL Query --------
?>
Thanks in advance.
You will need to use AJAX to do this. Here is a simple example:
HTML
Just a simple link, like you have in the question. However I'm going to modify the structure a bit to keep it a bit cleaner:
<a id='update_status' href='updateRCstatus.php' data-rxdtime='$time' data-txid='$txid' data-balance='$balance' data-ref='$ref'>Update</a>
I'm assuming here that this code is a double-quoted string with interpolated variables.
JavaScript
Since you tagged jQuery... I'll use jQuery :)
The browser will listen for a click event on the link and perform an AJAX request to the appropriate URL. When the server sends back data, the success function will be triggered. Read more about .ajax() in the jQuery documentation.
As you can see, I'm using .data() to get the GET parameters.
$(document).ready(function() {
$('#update_status').click(function(e) {
e.preventDefault(); // prevents the default behaviour of following the link
$.ajax({
type: 'GET',
url: $(this).attr('href'),
data: {
rxdtime: $(this).data('rxdtime'),
txid: $(this).data('txid'),
balance: $(this).data('balance'),
ref: $(this).data('ref')
},
dataType: 'text',
success: function(data) {
// do whatever here
if(data === 'success') {
alert('Updated succeeded');
} else {
alert(data); // perhaps an error message?
}
}
});
});
});
PHP
Looks like you know what you're doing here. The important thing is to output the appropriate data type.
<?php
$rxdtime=$_GET["rxdtime"];
$txid=$_GET["txid"];
$balance=$_GET["balance"];
$ref=$_GET["ref"];
header('Content-Type: text/plain; charset=utf-8');
// -------- SQL Query -------
// your logic here will vary
try {
// ...
echo 'success';
} catch(PDOException $e) {
echo $e->getMessage();
}
Instead of <a href>, use ajax to pass the values to your php and get the result back-
$.post('updateRCstatus/test.html', { 'rxdtime': <?php ecdho $time ?>, OTHER_PARAMS },
function(data) {
alert(data);
});
Here is the PHP documentation
Here is how I would use it in an Ajax call, if I don't find a pure client way to do this.
$homepage = file_get_contents('http://www.example.com/');
echo $homepage;
Is there way to do this client side instead so I don't have to ajax the string over?
you could do
JS code:
$.post('phppage.php', { url: url }, function(data) {
document.getElementById('somediv').innerHTML = data;
});
PHP code:
$url = $_POST['url'];
echo file_get_contents($url);
That would get you the contents of the url.
It's 2020 and some modern approach;
async function file_get_contents(uri, callback) {
let res = await fetch(uri),
ret = await res.text();
return callback ? callback(ret) : ret; // a Promise() actually.
}
file_get_contents("https://httpbin.org/get", console.log);
// or
file_get_contents("https://httpbin.org/get").then(ret => console.log(ret));
JavaScript cannot go out and scrape data off of pages. It can make a call to a local PHP script that then goes on its behalf and grabs the data, but JavaScript (in the browser) cannot do this.
$.post("/localScript.php", { srcToGet: 'http://example.com' }, function(data){
/* From within here, data is whatever your local script sent back to us */
});
You have options like JSONP and Cross-Origin Resource Sharing at your disposal, but both of those require setting up the other end, so you cannot just choose a domain and start firing off requests for data.
Further Reading: Same origin policy
This function will return the file as a string just like the PHP file_get_contents().
function file_get_contents(uri, callback) {
fetch(uri).then(res => res.text()).then(text => callback(text));
}
However unlike PHP, JavaScript will go on to the next statement, not waiting for the data to return.
Not in a general sense. Cross-domain restrictions disallow Javascript code from doing this.
If the target site has CORS (cross-origin resource sharing) set up, you can use XMLHttpRequest to load files. Most sites do not, as it's off by default for security reasons, and is rarely necessary.
If you just need to include an HTML page, you can stick it in an <iframe> element. This is subject to some layout gotchas, though (the page ends up in a fixed-size element).
Or You can use php.js library. Which allow some php functions for javascript. file_get_contents() function one of them.
<script>
var data = file_get_contents('Your URL');
</script>
You can find more info about php.js : http://phpjs.org/
I think this may be useful for you:
An npm package with the "file-get-contents" method for node.js
https://www.npmjs.com/package/file-get-contents
It is asynchronous so if you are using express it should be used like this
app.get('/', async (req, res)=>{
//paste here the code below
}
Example
const fileGetContents = require('file-get-contents');
// A File request
try {
let data = await fileGetContents('/tmp/foo/bar');
console.log(data);
} catch (err) {
console.log('Unable to load data from /tmp/foo/bar');
}
// Or a HTTP(S) request
fileGetContents('https://pokeapi.co/api/v2/pokemon/1/').then(json => {
const pokemon = JSON.parse(json);
console.log(`Name of first pokemon is ${pokemon.name}`);
}).catch(err => {
console.err(`Unable to get content from PokeAPI. Reason: ${err.message}`);
});
<div id="svg">
</div>
<script>
function file_get_contents(uri, callback) {
fetch(uri).then(res => res.text()).then(text =>
{
var xmlSvg =text;
console.log(xmlSvg );
document.getElementById('svg').innerHTML = xmlSvg;
})
}
var uri ='You-urlllllllll-svg';
file_get_contents(uri);
</script>
function file_get_contents(filename) {
fetch(filename).then((resp) => resp.text()).then(function(data) {
document.getElementById("id").innerHTML = data;
});
}
file_get_contents("url");
<span id="id"></span>
Well, another try:
this is all the jquery code i'm using maybe i made something wrong in the code before $.post(); i call the following function with the onclick of the same form...
function setLogin()
{
$('#login-form').submit(function(e) {
e.preventDefault();
//passing form field to vars
var formUsername=$("#login-form #username").val();
var formPassword=$("#login-form #password").val();
//checks on fields lenght
if((formUsername.length<6))
{
$("#ajax-output").html("<div class='error'>Attenzione username troppo breve!</div>");
}
else if((formPassword.length<6))
{
$("#ajax-output").html("<div class='error'>Attenzione password troppo breve!</div>");
}
else
{
$.post(
//the url
'?module=login',
//data got from login form
{
"username": formUsername,
"password": formPassword,
},
//response
function(data){
$("#ajax-output").html(data.reply)
},
//type
"json"
);
}
});
}
i tried with only this code in php file and it still doesn't return anything...
function Login()
{
//just to try
echo json_encode(array('reply'=>'foo'));
}
it still doesn't work...
Are you sure the post is being run in the first place?
Use Firebug! (or chrome's built-in developer tools)
You can use firebug to pick apart every bit of a web page.
It has a "net" tab that shows every request that is made by the browser, including AJAX requests, and their results, headers and contents.
Use it to see if your requests is really being made, and what the result is. Then take it from there.
Make sure that you're setting a header for the content type when responding - the browser may not attempt to use the JSON if it doesn't know it's receiving JSON.
function Login()
{
header('Content-Type: application/json');
echo json_encode(array('reply'=>'foo'));
}
Im currently new to PHP and JQuery after having using ASP.Net and C Sharp for the 2 years. I have this major problem in which i require some assistance in.
I have a HTML <input type="submit" id="btnWL" value="Add to Wishlist"> button. Basically when this button is pressed a table called 'wishlist' in the database is checked to see if the current product is already in a wishlist. If no the button will trigger a database save else it will return a JQuery alert pop up error message.
I having difficulty in passing 2 PHP variables: $_SESSION["username"] and $_GET["ProductId"] into this JQuery method:
<script type="text/javascript">
$(document).ready(function() {
$('#btnWL').live('click', function() {
$.post("addToWishlist.php");
});
});
</script>
As you can see this JQuery method must pass those values to an external PHP File which checks for an already exsisting record in the 'wishist' table with those details.
<?php
$WishlistDAL = new WishlistDAL();
$result = $WishlistDAL->get_ProductInWishlistById($_GET["ProductId"]);
if (isset($_POST["isPostBack"])) {
if (isset($_SESSION["username"])) {
if (isset($_GET["btnWL"])) {
//Check if ProductId is in Cart
if (mssql_num_rows($result)>0)
{
//Return an error
//Sumhow this has to trigger an alert box in the above JQuery method
}
else
{
//Write in Wishlist Table
$WishlistDAL->insert_ProductInWishlist($_GET["ProductId"], $_SESSION["username"]);
}
}
}
else
{
//Return Error
}
}
?>
Another problem I have is then displaying an alert box using the same JQuery method for any errors that where generated in the php file.
Any Ideas how I can implement this logic? Thanks in advance.
Your "$.post()" call isn't passing any parameters, and has no callback for interpreting the results:
$.post('addToWishlist.php', { username: something, password: something }, function (response) {
});
The "something" and "something" would probably come from your input fields, so:
$.post('addToWishlist.php', { username: $('#username').val(), password: $('#password').val() }, function (response) {
});
Now the callback function would interpret the response from the server:
$.post('addToWishlist.php', { username: $('#username').val(), password: $('#password').val() }, function (response) {
if (response === "FAIL") {
alert("fail");
}
else {
// ... whatever ...
}
});
Exactly what that does depends on your server code; that "FAIL" response is something I just made up as an example of course.
jQuery accepts an callback:
$(document).ready(function() {
$('#btnWL').live('click', function() {
$.post("addToWishlist.php", {'isPostBack':1}, function(res){
if (res.match(/err/i)){
alert(res);
}
});
});
});
Then, in the php, just (echo('Error adding record')) for this jquery to see there's an error string in the response and pop up the error message.
Other methods would be to use json, or http status codes and $.ajaxError(function(){ alert('error adding'); });.
from what i can tell so far is you'll only need to pass in the product id in and you can do this by appending your $.post call with the value; this will pass to your php script as a query string variable. i'm not sure which php script you posted, but if you're sending your data with jquery, it's using post and not get, so you may need to make an adjustment there and the session data should be available regardless, since it's the same session.
again this is without seeing all the code and since some of it isn't labeled, it's hard to determine. another thing, i like to use $.ajax for most actions like this, you have a lot more room to define and structure, as well as create one generic ajax function to call the methods and post data, as well as make a response callback. here's the documentation for you to look into $.ajax
i hope this helps.
I am trying to create a little ajax chat system (just for the heck of it) and I am using prototype.js to handle the ajax part.
One thing I have read in the help is that if you return json data, the callback function will fill that json data in the second parameter.
So in my php file that gets called I have:
header('Content-type: application/json');
if (($response = $acs_ajch_sql->postmsg($acs_ajch_msg,$acs_ajch_username,$acs_ajch_channel,$acs_ajch_ts_client)) === true)
echo json_encode(array('lastid' => $acs_ajch_sql->msgid));
else
echo json_encode(array('error' => $response));
On the ajax request I have:
onSuccess: function (response,json) {
alert(response.responseText);
alert(json);
}
The alert of the response.responseText gives me {"lastid": 8 } but the json gives me null.
Anyone know how I can make this work?
This is the correct syntax for retrieving JSON with Prototype
onSuccess: function(response){
var json = response.responseText.evalJSON();
}
There is a property of Response: Response.responseJSON which is filled with a JSON objects only if the backend returns Content-Type: application/json, i.e. if you do something like this in your backend code:
$this->output->set_content_type('application/json');
$this->output->set_output(json_encode($answer));
//this is within a Codeigniter controller
in this case Response.responseJSON != undefined which you can check on the receiving end, in your onSuccess(t) handler:
onSuccess:function(t) {
if (t.responseJSON != undefined)
{
// backend sent some JSON content (maybe with error messages?)
}
else
{
// backend sent some text/html, let's say content for my target DIV
}
}
I am not really answering the question about the second parameter of the handler, but if it does exist, for sure Prototype will only provide it in case of proper content type of the response.
This comes from Prototype official :
Evaluating a JavaScript response
Sometimes the application is designed
to send JavaScript code as a response.
If the content type of the response
matches the MIME type of JavaScript
then this is true and Prototype will
automatically eval() returned code.
You don't need to handle the response
explicitly if you don't need to.
Alternatively, if the response holds a
X-JSON header, its content will be
parsed, saved as an object and sent to
the callbacks as the second argument:
new Ajax.Request('/some_url', {
method:'get', onSuccess:
function(transport, json){
alert(json ? Object.inspect(json) : "no JSON object");
}
});
Use this functionality when you want to fetch non-trivial
data with Ajax but want to avoid the
overhead of parsing XML responses.
JSON is much faster (and lighter) than
XML.
You could also just skip the framework. Here's a cross-browser compatible way to do ajax, used in a comments widget:
//fetches comments from the server
CommentWidget.prototype.getComments = function() {
var commentURL = this.getCommentsURL + this.obj.type + '/' + this.obj.id;
this.asyncRequest('GET', commentURL, null);
}
//initiates an XHR request
CommentWidget.prototype.asyncRequest = function(method, uri, form) {
var o = createXhrObject()
if(!o) { return null; }
o.open(method, uri, true);
o.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
var self = this;
o.onreadystatechange = function () {self.callback(o)};
if (form) {
o.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
o.send(makePostData(form));
} else {
o.send('');
}
}
//after a comment is posted, this rewrites the comments on the page
CommentWidget.prototype.callback = function(o) {
if (o.readyState != 4) { return }
//turns the JSON string into a JavaScript object.
var response_obj = eval('(' + o.responseText + ')');
this.comments = response_obj.comments;
this.refresh()
}
I open-sourced this code here http://www.trailbehind.com/comment_widget