I am working on a form set for a client. In a nutshell:
The forms are filled out by my client’s customers by selecting different options on each form.
Each form can have multiple instances, depending on the customer.
At the end of the process, the customer can opt to either sign one or all the forms digitally or decline to sign them digitally and at the end of the process the forms are printed out and signed manually.
To accomplish this, I’ve created a signature plugin written in jQuery. Once the customer fills out the forms, they are presented each form separately. To sign the form digitally they simply tap (click) the signature block, a dialog with a canvas element appears, they sign the form and save it, the signature appears in the form, and they move on to the next form.
Here is the portion of the code that stores the completed signature and adds the image to the form:
$.sig = {
signatures: {},
}
function signatureSave() {
var canvas = document.getElementById("sigcanvas"),
dataURL = canvas.toDataURL("image/png");
document.getElementById($.sig.target).src = dataURL;
$.sig.signatures[$.sig.target].url = dataURL;
$.sig.signatures[$.sig.target].hasSignature = true;
};
The function is only called if the signature is saved, if there is no signature, the $.sig.signatures[$.sig.target].hasSignature remains false and the system skips the object.
This all works as intended, almost.
My problem lies in the process used to save the form information. If the customer does not sign any forms digitally the form information is simply saved and the forms are printed out, no need to save any signatures.
If the customer signs at least one form, though, the signatures must be sent to the server using the FormData() object.
I’ve used the FormData object in other projects for the client successfully, but only when the customer uploads one or more images to the browser using the input file element. It’s a pretty simple process because the resulting images have a img.file property that I send to the server.
Not so with a canvas object. All I get is the .src property, an any attempt to use anything from the resulting .png image that is created in the function above results in either a “cannot use a blob” or some other error.
Now I know if I have a single image, I can send it using AJAX with the following:
$.ajax({
type: "POST",
url: "script.php",
data: {
imgBase64: dataURL
}
})
Problem is that I am sending from one to x number of signatures.
Edit: I forgot to add this in. This is the function that is supposed to create the FormData object used to send the signatures to the server (and where my problem lies):
function getUploadData() {
var upl = new FormData();
$.each($.sig.signatures, function (e, u) {
if (u.hasSignature == true && u.url != null) {
var im = new Image();
im.src = u.url;
upl.append(u.target, im, u.target + '.png');
}
})
return upl;
}
I've tried all the tricks and nothing is working. The var im = new Image(); as well as the following line are just my latest ill fated attempt.
Picture perfect would be the ability to save the image information in the $.sig.signatures object so I can simply loop through any signatures that are signed, add them as elements of the FormData object, and then send the FormData object as the data for the AJAX call. As stated before, I use this method in other projects and works fine.
Does anyone know a way to do this?
Please note:
The server-side AJAX processor functions correctly.
The signature process works correctly (customer signs canvas, signature is displayed, signature information is stored).
All I need is how to send multiple images created using the canvas element in a FormData object to the server.
I know the answer is staring me right in the face, but I am just not getting it. Any hints or suggestions would be greatly appreciated!
Edit: Just a note. I've searched the entire afternoon for this and have found entries that either deal with sending multiple files using FormData and AJAX - but the files are uploaded to the browser (not created using Canvas), or single files sent to the server that are created using Canvas, but nothing about sending multiple files sent using FormData and AJAX that are created using Canvas. Oje!
As stated, the answer was staring me in the face, but I didn't see it because was looking behind the wrong door. FormData has nothing to do with it (Homer Dope Slap!).
Since I already have the data stored in $.sig.signature for each signature, I just need to send the information to the server as the data in the AJAX function. I updated my function above as shown:
function getUploadData() {
var upl = {};
$.each($.sig.signatures, function (e, u) {
if (u.hasSignature == true && u.url != null) {
upl[e] = u.url;
}
})
return upl;
}
Since the form information is sent as JSON I just add the signature info to the object that contains the form information, JSON.stringify it and send it on its way. This should work because the information retrieved above are strings.
Server side will look something like this:
$info = json_decode( $_POST['info'] );
// Various validation routines and checks
foreach( $info->signatures as $sig=>$data ):
$data = str_replace('data:image/png;base64,', '', $data);
$data = str_replace(' ', '+', $data);
$img = base64_decode($data);
// Do some processing, file naming, database saving and other general dodads
$success = file_put_contents( $file, $img );
endforeach;
The above function is still concept, I am reworking some of the code but this should work.
Credit is given to this post for opening my eyes:
post sending base64 image with ajaxpost sending base64 image with ajax
So question answered and yeah, I deserve a dope slap, but all comes out right in the end.
CAVEAT: Works like a charm.
Related
I am writing a page update which works with PHP to read a SQL database the page echo's the contents in a div section 'track_data'. yet it doesn't do this update idk
I have JavaScript script which I dont really fully understand and hopeful someone could explain its principally the check response section I think is failing ? :
in my PHP page :
<script type="text/javascript">
function InitReload() {
new Ajax.PeriodicalUpdater('track_data', 'fetch_sql.php', {
method: 'get', frequency: 60, decay: 1});
}
</script>
Thanks for looking and hopefully someone undersstands this and can put a smile on my face for the second time today :)
Steps to fix
Thanks for the suggestions of syntax errors. I haven't really got very far with this here are the changes you suggested which I have changed but I still think there is something wrong with last function as it doesn't update div section.
Code in JS file
// Start Clock refresh
// uses new new Ajax.PeriodicalUpdater(
// in main fetch file to trigger the auto update of the page.
// Written by Denise Rose
var gUpdateDiv;
var gContentURL;
var gcheckInterval;
var gcheckURL = "";
var gCurrentCheck ="";
_fetchUpdater('track_data','/fetch_sql.php','/fetch_sql.php',8000);
function _fetchUpdater(updateDiv,contentURL,checkURL,checkInterval)
{
gUpdateDiv = updateDiv;
gContentURL = contentURL;
gcheckInterval = checkInterval;
gcheckURL = checkURL;
setTimeout('check();',gCheckInterval);
}
//Called by _fetchUpdater every (n) seconds determins if content should be updated.
function check()
{
new Ajax.Request(gContentUrl,{method:'get', onSuccess:'checkResponse'});
setTimeout('check();',gCheckInterval);
}
// looks for the response and determines if the div should be updated.
function checkResponse(transport)
{
var content = transport.response.Text;
if(gCurrentCheck != content) {
gCurrentCheck = content;
new Ajax.Request(gContentUrl, {method: 'get',onSuccess:function t() {
$(gUpdateDiv).innerHTML = t.responseText; /*t.response.json()*/}
});
}
}
This is the bit I dont understand
function checkResponse(transport)
{
var content = transport.response.Text;
if(gCurrentCheck != content) {
gCurrentCheck = content;
new Ajax.Request(gContentUrl, {method: 'get',onSuccess:function t() {
$(gUpdateDiv).innerHTML = t.response.json();/*t.responseText;*/}
});
}
}
Method and Issues
What is transport here and what is t? if it stores the contents of the body text from the second in gCurrentCheck and compares to transport version content then why doesn't it update if its different please which it is if the SQL has created a different page?
I did find this https://api.jquery.com/jquery.ajaxtransport/
First Answer not using Ajax
I was given a neat and JS version as an answer, which is not really what I was looking for. I was hopeful to get the one working with one with Ajax but I appreciate your efforts is very kind. I just really wanted to send a refresh to the div area so that the PHP rebuilt the page from the SQL.
I might have been missing the MIT javascript http://www.prototypejs.org/ lol but I dont think it was.
Just to help:
AJAX stands for Asynchronous JavaScript And XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with servers. It can send and receive information in various formats, including JSON, XML, HTML, and text files. ... Make requests to the server without reloading the page.
Researching
I found this Update div with the result of an Ajax-call but it did not really explain as the OP was using PHP like me not HTML. The answer was given:
$.ajax({
url: 'http://dowmian.com/xs1/getcam.php',
type: 'GET',
data: {id: <?php echo $cam_id; ?>},
success: function(responseText){
$('#update-div').html(responseText);
},
error: function(responseText){
}
});
I dont think above it answered posters question or mine as ajax is a server based push how is this relevant? as if its PHP driven the needs a refresh at server to refresh the contents not to provide new html. It is this refresh I am not interested in to re-copy PHP code elsewhere in JS as its already in my PHP. Does that make more sense?
Update
I did find a bracket missing and a set of single quotes inserted by editor. Which I have updated above but there was no significant change.
Cheers Nicolas . I am still hopeful that someone knows about Ajax as it sits underneath these technologies. I have a server side PHP file that I was hoping to use AJAX to pull just the PHP from the section it was pointing to an gUpdateDiv . As its derived from the server and created on the fly from SQL. I dont see how your answer would help push this data back in to the from the server . The $(gUpdateDiv).innerHTML was supposed to be acted upon not the whole page . What I am unsure of is how a trigger from this can update timer just this $(gUpdateDiv).innerHTML . I am also not aware if a server based refresh would do this or if the transport id provided from the file would be able to deliver just that . I think I am missing something a vital part that I dont have or have grasped yet. The reason there is two timers is effectively it checks the same file at a different point in time as its created by PHP it might be different from the first if it is i.e. the SQL data has changed, I want this to update this $(gUpdateDiv).innerHTML with the data which it compared it to the second 'Get' in the second request. It sounds, simple in practice but have got stuck comparing two versions and insuring second version gets used .
Further update placing an alert in the Javascript file did not pop up like it does here https://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_alert however the same alert in the initiating PHP worked fine and created the alert. called the same function from the main PHP nd the alert occurred so the JavaScript is running next visit F12 on the page to see if there is any warnings or errors. Ok after adding JQuery which I thought I had added this started working however It is not doing what i Expected it to do. As the contained both text and graphics created by PHP I expected this all to be updated The graphics are not the text is any ideas? .
Further to the image problems I placed an extra line to update the image however I used this too in PHP
<script type="text/javascript">
//initpage() ;
function updateArtworkDisplay() {
document.querySelector('#np_track_artwork').src = 'images/nowplaying_artwork_2.png?' + new Date().getTime();
}
</Script>
But it didnt work to update the image in php?
<div id='outer_img'><img id='#np_track_artwork' src='/images/nowplaying_artwork_2.png' alt='Playing track artwork' width='200' height='200'></div>
in js change
/ looks for the response and determines if the div should be updated.
function checkResponse(transport)
{
var content = transport.response.Text;
if(gCurrentCheck != content) {
gCurrentCheck = content;
new Ajax.Request(gContentUrl, {method: 'get',onSuccess:function t() {
$(gUpdateDiv).innerHTML = t.responseText; /*t.response.json()*/}
});
updateArtworkDisplay(); // fire up the redraw in php file.
}
}
Nearly there it does almost what it needs to apart from the redraw which is not happening
// Start Clock refresh
// uses new new Ajax.PeriodicalUpdater(
// in main fetch file to trigger the auto update of the page.
// Written by Denise Rose
var gUpdateDiv="";
var gContentURL="";
var gcheckInterval=0;
var gcheckURL = "";
var gCurrentCheck ="";
_fetchUpdater('track_data','/fetch_sql.php','/fetch_sql.php',8000);
function _fetchUpdater(updateDiv,contentURL,checkURL,checkInterval)
{
gUpdateDiv = updateDiv;
gContentURL = contentURL;
gcheckInterval = checkInterval;
gCheckURL = checkURL;
setTimeout('check();',gcheckInterval);
}
//Called by _fetchUpdater every (n) seconds determins if content should be updated.
function check()
{
new Ajax.Request(gCheckURL,{method:'get', onSuccess:'CheckResponse()'});
setTimeout('check();',gcheckInterval);
}
// looks for the response and determines if the div should be updated.
function checkResponse(transport)
{
var content = transport.response.Text;
if(gCurrentCheck != content) {
gCurrentCheck = content;
new Ajax.Request(gContentUrl, {method: 'get',onSuccess:function t() {
$(gUpdateDiv).innerHTML = t.responseText; /*t.response.json()*/}
});
$time = new Date().getTime();
new Ajax.Request('outer_img', {method: 'get',onSuccess:function s() {
$('outer_img').innerHTML = "<img id='#np_track_artwork' src='/images/nowplaying_artwork_2.png?t='"+$time+" alt='Playing track artwork' width='200' height='200'>"}
});
}
}
GIVEN UP WITH THIS PLEASE DELETE MY PERSONAL INFORMATION AND POSTSript-fetch-async-await/
I am using JavaScript to take the info from a form completed by the user, then sending this data to PHP and generate a PDF with FPDF. The problem is I want the browser to ask the user to save the PDF or view it online but
I cannot figure out how. The PDF generates correctly but only when I save it directly to a certain path specified by me.
The question is how do you guys send data from JavaScript to PHP to generate a PDF file then the browser asks the user to open or download, Or how can I make a function where the user can retrieve this PDF.
The JavaScript:
function senddata() {//this activates when i push a button not a submit
var peticion = new XMLHttpRequest();
peticion.open('POST', 'generatepdf.php');
var nueva2 = {};
var key;
for (i = 0; i < 6; i++) {
key = document.forms[0].elements[i].id;
nueva2[key] = document.forms[0].elements[i].value;
}//here i take my data from the form and make an object
var json = JSON.stringify(nueva2);//here i tranform my object to json string so i can send it to my php
var parametros = "json_string=" + json;//here I do this so later I can easily transform the $_POST to an array in the form json_decode($_POST["json_string"],true);
peticion.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
peticion.send(parametros);//it sends ok
}
The PHP with the FPDF class and things
<?php
require('fpdf/fpdf.php');
require('functions.php');
if($_SERVER['REQUEST_METHOD']=='POST'){
$datos=json_decode($_POST["json_string"],true); //here i have my data in an array format so i can use the parameters to fill my pdf fields
//...lots of pdf things here...//
$pdf->Output('F',"pdfs/Cotizacion ".$datos["nombres"]." ".$datos["apellidos"].".pdf");//this works but never ask the user
//$pdf->Output('D',"pdfs/Cotizacion ".$datos["nombres"]." ".$datos["apellidos"].".pdf");//this should force a dowload or send to the browser but doesnt work
//$pdf->Output();//this should send to the browser but doesnt work
}
To view your PDF inline to the browser, you should use the I variable instead. View full documentation here.
Also I don't think outputting the file in two methods at the same time works. It might conflict each other. The best way to do that is to test each method and if it does conflict each other just simply add a condition for the user to decide whether he/she wants to download or view it in the browser. Hope this helps.
Hello I am wondering what is the common method of structuring ajax and php?
I am doing a website/application which have a lot of ajax calls. Also I do have a class in php I use for my main php code for keeping track of the user.
When I do ajax calls with jquery to smaller php files I need to re-declare my object I have in other files. I want the object that I have in my "main" php file. What is a good method to get the same object? Right now I am using jquery to pass the values from a div element (which comes from the object previously).
I feel this is not the best practice. I want to do it structured.
Example: I store the user session in User.
I have a button a user can click to get some information about his data. For this I have a jquery ajax call which sends and retrieves data for display. In that php file I do have to redo everything again, even if I include the class file, because the object is declared elsewhere.
Example. User can create lists in this kind of way.
I have the main index file which includes this file of new User. This type of stuff.
$user = new User();
if($_SESSION["user_connected"])
{
$user_profile = $twitter->getUserProfile();
$displayname = $user_profile->displayName;
}
$user->username = $displayname;
// Also user has an array of lists
jQuery
$('#createlistform').submit(function(event)
{
var newlistname = $('#listname').val();
var createlistRequest = $.ajax(
{
url: "ajax/ajax_add_list.php",
dataType: "html",
type: "POST",
data: {
listname: newlistname
}
}
);
the ajax_add_list file ajax is calling below. Now what I do to get this work is sending the username through as a data parameter to the php file from picking it up by $('#username').text() then set a new user with that username. It is not in the example now... but you get the point I think.
include_once("../user.class.php");
$theUser = new User();
if(class_exists('User'))
{
echo "yes class exists";
$newlistname = $_POST['listname'];
$theUser->createList($newlistname);
}
I wish I could get the same User object that was defined in my index file. I don't wanna create a new one. Although if this is how people do it when they have ajax I'll do it. I just want to know how you usually go by when dealing with different files here and there with javascript getting data from various places, while still maintaining a good structure with class and object.
I have an image data here from my console came from DOM displaying it using array
The console data look like this, I perfectly getting this data my problem is how to pass and get that image data into php
["data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAuSgpcjBs5Go81S/7+/x/MmaPEm
0:"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAAAB4CAYAAAA5ZDbSAAAgAEl
1:"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAAAB4CAYAAAA5ZDbSAAAY3U
2:"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAAAB4CAYAAAA5ZDbSAAAgAElE
3:"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAHgAAAB4CAYAAAA5ZDbSAAAgAEl
Its a long string I did not just continue. I'm not sure if its an object, array or what. Is this possible to pass that value into PHP and then save the image into folder?
var image = [];
$('.dz-image img').each(function(){
image.push($(this).attr('src'));
});
console.log(image);
in general, you're looking at a Data URI - see https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs for more info.
in this particular case, you seem to be looking at a base64 encoded PNG file - if you want to upload the PNG to a PHP script on the server, you actually have a TON of options around what happens where (and in what order), but one possible approach is to a) always assume you're dealing w/ base64 encoded PNGs (if you know that not to be true, then you'll have to handle the first two parts of the data URI), b) upload data ($.post() the stuff after the comma) to PHP, c) base64 decode the data on the PHP side
Pass the value into PHP from javascript, consider to use ajax? In my experience, the http-post can transfer Array to PHP directly, like this:
var image = [];
$('.dz-image img').each(function(){
image.push($(this).attr('src'));
});
//console.log(image);
//here, I use jQuery, but you can use any way of ohter javascript framework
$.ajax({
type:'post',
tranditional:true,
url:'saveImage.php',
data:{"iamge":image},
success:function(data){
console.log(image)
}
})
In the php side, if you need to save image address into database, just do it like insert data to database. If you want to save the image into folder, do like this: saveImage.php
<?php
$images = $_POST['image'];
//here, you can code var_dump($image) to console the data you get
foreach($images as $key=>$image){
$image = base64_decode(str_replace('data:image/png:base64,','', $image));
file_put_contents($key.'.jpg', $image);
}
now, have a try?^-^
I have problems when saving html5 data from a page into mysql through an ajax request and trying to retrieve it back with ajax. HTML attributes that trigger some javascript such as
<onload> or <iframe> will be stored as <on<x>load> and <if<x>rame> in the database and thus screw up the page when loading it.
Here's a short description of what I am trying to accomplish: I want registered users to have the ability to highlight text on my site and get the highlighted text back after refreshing the page, relogging etc.
What I have done so far: I implemented a javascript highlight library on my server that allows users to highlight text. That works well.
By clicking a button, those data are then saved into mysql through jquery ajax post. See specific code here:
Javascript
$(document).ready(function() {
//saves highlighted data in var "highlighted"
$('#savehighlights').click(function() {
var highlighted = $('.tabcontent.content1').html();
//send data to server
$.ajax({
url: 'highlight.php',
type: 'POST',
data: {highlighted: highlighted},
dataType: 'html',
success: function(result) {
console.log(result);
}
});
});
Saving the data to mysql works generally, but it looks as if certain commands are disabled through the process (e.g. onload becomes on<x>load5). The data are stored in the database as longtext and utf8_bin. I also tried blob, but problem remains. I also tried different dataTypes with Ajax such as 'text' and 'script'. 'Text' causes the same problem and 'script doesn't work at all. I also tried the ajax .serialize function, but no luck either.
I really don't know what to do about it and I am not sure what is causing the problem, Ajax or mysql? I was searching the web for an answer, including many articles in stackoverflow (which normally always give me the answer), but this time I am stuck. Either I don't know enough about it to look for the right question, or I just don't have any luck this time. So, any help would be greatly appreciated.
I was requested to add some more information. Here it is:
I am actually doing this on my local server (localhost) with XAMP, so security issues should not be a problem, right? If it is of any help, I am doing this in a Tiki Wiki CMS. The php script that is called through ajax (highlight.php) is the following:
require_once ('tiki-setup.php');
include_once ('lib/highlights/highlightslib.php');
$highlighted = $_POST['highlighted'];
$highlightslib->save_highlights($user, $highlighted);
The highlightslib library is here:
if (strpos($_SERVER["SCRIPT_NAME"], basename(__FILE__)) !== false) {
header("location: index.php");
exit;
}
class HighlightsLib extends TikiLib
{
function save_highlights($user, $highlighted) {
$saveHighlights = $this->table('tiki_user_highlights');
$saveHighlights->insert
(array(
'user' =>$user,
'highlightId' =>'',
'data' =>$highlighted,
'created' =>$this->now,
)
);
return true;
}
};
$highlightslib = new HighlightsLib;