How do I fetch PHP script output from Javascript? - javascript

This is an example of the PHP script I want to get the output from within my javascript file:
data.php
<?php
$input = file_get_contents('data.txt');
echo $input."\n";
?>
script.js
$(document).ready(function(){
var data;
// get output from data.php
console.log( data );
});
I just want a way to test to see if the data from within the data.txt file that is being stored in a php variable can be passed into the javascript file and then printed within the javascript console on the html page.
I want to do this so that I can store a variable in the text file and then reference it as it dynamically is updated from multiple users at the same time.
I've seen ways to do this, but it involves the javascript being in the same file as the html, which is not the case here. I'm also using jquery so I don't know if that makes a difference. I've never used php before and am new to javascript, so any help would be appreciated.

You can put you php code in the javascript file if you change the extension to "php". As "php" extensions will get delivered as Html per default, you have to state that it is Javascript in the code.
script.js.php
<?php header('Content-Type: application/javascript');
?>console.log("<?php
$input = file_get_contents('data.txt');
echo $input."\n";
?>");
$(document).ready(function(){
$("#imgTag, #img2").on("click", process);
var size = 0;
function getTarget(evt)
{
evt = evt || window.event;
return evt.target || evt.scrElement;
}
var temp;
console.log("before get");
console.log("post get");
console.log(size);
function changeSize(myName, myOther)
{
var name = myName;
var other = myOther;
if($("#" + name).height() < 400)
{
$("#" + name).height($("#" + name).height() + 5);
$("#" + name).width($("#" + name).width() + 5);
$("#" + other).height($("#" + other).height() - 5);
$("#" + other).width($("#" + other).width() - 5);
}
}
function process(event)
{
var name = getTarget(event).id;
var other;
if(name == "imgTag")
{
other = "img2";
}
else
other = "imgTag";
console.log($("#" + name));
console.log("Changing size!!!");
console.log( $("#" + name).height());
changeSize(name, other);
}
});

You can read that text file directly with jquery like this:
$.ajax({
url : "data.txt",
dataType: "text",
success : function (data) {
// Display the data in console
console.log(data);
// Or append it to body
$('body').append(data);
}
});
The same way you can read output from your php file, in which case you should change the url to point to your php file. Another thing you should read about is different options of communicating server-client side like json data structure etc.
Documentation: https://api.jquery.com/jQuery.ajax/

Related

Using jQuery/javascript to dynamically add all images in a directory [duplicate]

I have a folder named "images" in the same directory as my .js file. I want to load all the images from "images" folder into my html page using Jquery/Javascript.
Since, names of images are not some successive integers, how am I supposed to load these images?
Works both localhost and on live server without issues, and allows you to extend the delimited list of allowed file-extensions:
var folder = "images/";
$.ajax({
url : folder,
success: function (data) {
$(data).find("a").attr("href", function (i, val) {
if( val.match(/\.(jpe?g|png|gif)$/) ) {
$("body").append( "<img src='"+ folder + val +"'>" );
}
});
}
});
NOTICE
Apache server has Option Indexes turned on by default - if you use another server like i.e. Express for Node you could use this NPM package for the above to work: https://github.com/expressjs/serve-index
If the files you want to get listed are in /images than inside your server.js you could add something like:
const express = require('express');
const app = express();
const path = require('path');
// Allow assets directory listings
const serveIndex = require('serve-index');
app.use('/images', serveIndex(path.join(__dirname, '/images')));
Use :
var dir = "Src/themes/base/images/";
var fileextension = ".png";
$.ajax({
//This will retrieve the contents of the folder if the folder is configured as 'browsable'
url: dir,
success: function (data) {
//List all .png file names in the page
$(data).find("a:contains(" + fileextension + ")").each(function () {
var filename = this.href.replace(window.location.host, "").replace("http://", "");
$("body").append("<img src='" + dir + filename + "'>");
});
}
});
If you have other extensions, you can make it an array and then go through that one by one using in_array().
P.s : The above source code is not tested.
This is the way to add more file extentions, in the example given by Roy M J in the top of this page.
var fileextension = [".png", ".jpg"];
$(data).find("a:contains(" + (fileextension[0]) + "), a:contains(" + (fileextension[1]) + ")").each(function () { // here comes the rest of the function made by Roy M J
In this example I have added more contains.
If interested in doing this without jQuery - here's a pure JS variant (from here) of the answer currently most upvoted:
var xhr = new XMLHttpRequest();
xhr.open("GET", "/img", true);
xhr.responseType = 'document';
xhr.onload = () => {
if (xhr.status === 200) {
var elements = xhr.response.getElementsByTagName("a");
for (x of elements) {
if ( x.href.match(/\.(jpe?g|png|gif)$/) ) {
let img = document.createElement("img");
img.src = x.href;
document.body.appendChild(img);
}
};
}
else {
alert('Request failed. Returned status of ' + xhr.status);
}
}
xhr.send()
Here is one way to do it. Involves doing a little PHP as well.
The PHP part:
$filenameArray = [];
$handle = opendir(dirname(realpath(__FILE__)).'/images/');
while($file = readdir($handle)){
if($file !== '.' && $file !== '..'){
array_push($filenameArray, "images/$file");
}
}
echo json_encode($filenameArray);
The jQuery part:
$.ajax({
url: "getImages.php",
dataType: "json",
success: function (data) {
$.each(data, function(i,filename) {
$('#imageDiv').prepend('<img src="'+ filename +'"><br>');
});
}
});
So basically you do a PHP file to return you the list of image filenames as JSON, grab that JSON using an ajax call, and prepend/append them to the html. You would probably want to filter the files u grab from the folder.
Had some help on the php part from 1
$(document).ready(function(){
var dir = "test/"; // folder location
var fileextension = ".jpg"; // image format
var i = "1";
$(function imageloop(){
$("<img />").attr('src', dir + i + fileextension ).appendTo(".testing");
if (i==13){
alert('loaded');
}
else{
i++;
imageloop();
};
});
});
For this script, I have named my image files in a folder as 1.jpg, 2.jpg, 3.jpg, ... to 13.jpg.
You can change directory and file names as you wish.
Based on the answer of Roko C. Buljan, I have created this method which gets images from a folder and its subfolders . This might need some error handling but works fine for a simple folder structure.
var findImages = function(){
var parentDir = "./Resource/materials/";
var fileCrowler = function(data){
var titlestr = $(data).filter('title').text();
// "Directory listing for /Resource/materials/xxx"
var thisDirectory = titlestr.slice(titlestr.indexOf('/'), titlestr.length)
//List all image file names in the page
$(data).find("a").attr("href", function (i, filename) {
if( filename.match(/\.(jpe?g|png|gif)$/) ) {
var fileNameWOExtension = filename.slice(0, filename.lastIndexOf('.'))
var img_html = "<img src='{0}' id='{1}' alt='{2}' width='75' height='75' hspace='2' vspace='2' onclick='onImageSelection(this);'>".format(thisDirectory + filename, fileNameWOExtension, fileNameWOExtension);
$("#image_pane").append(img_html);
}
else{
$.ajax({
url: thisDirectory + filename,
success: fileCrowler
});
}
});}
$.ajax({
url: parentDir,
success: fileCrowler
});
}
This is the code that works for me, what I want is to list the images directly on my page so that you just have to put the directory where you can find the images for example -> dir = "images /"
I do a substring var pathName = filename.substring (filename.lastIndexOf ('/') + 1);
with which I make sure to just bring the name of the files listed and at the end I link my URL to publish it in the body
$ ("body"). append ($ ("<img src =" + dir + pathName + "> </ img>"));
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
<script src="jquery-1.6.3.min.js"></script>
<script>
var dir = "imagenes/";
var fileextension = ".jpg";
$.ajax({
//This will retrieve the contents of the folder if the folder is configured as 'browsable'
url: dir,
success: function (data) {
//Lsit all png file names in the page
$(data).find("a:contains(" + fileextension + ")").each(function () {
var filename = this.href.replace(window.location.pathname, "").replace("http://", "");
var pathName = filename.substring(filename.lastIndexOf('/') + 1);
$("body").append($("<img src=" + dir + pathName + "></img>"));
console.log(dir+pathName);
});
}
});
</script>
</head>
<body>
<img src="1_1.jpg">
</body>
</html>
If, as in my case, you would like to load the images from a local folder on your own machine, then there is a simple way to do it with a very short Windows batch file. This uses the ability to send the output of any command to a file using > (to overwrite a file) and >> (to append to a file).
Potentially, you could output a list of filenames to a plain text file like this:
dir /B > filenames.txt
However, reading in a text file requires more faffing around, so I output a javascript file instead, which can then be loaded in your to create a global variable with all the filenames in it.
echo var g_FOLDER_CONTENTS = mlString(function() { /*! > folder_contents.js
dir /B images >> folder_contents.js
echo */}); >> folder_contents.js
The reason for the weird function with comment inside notation is to get around the limitation on multi-line strings in Javascript. The output of the dir command cannot be formatted to write a correct string, so I found a workaround here.
function mlString(f) {
return f.toString().
replace(/^[^\/]+\/\*!?/, '').
replace(/\*\/[^\/]+$/, '');
}
Add this in your main code before the generated javascript file is run, and then you will have a global variable called g_FOLDER_CONTENTS, which is a string containing the output from the dir command. This can then be tokenized and you'll have a list of filenames, with which you can do what you like.
var filenames = g_FOLDER_CONTENTS.match(/\S+/g);
Here's an example of it all put together: image_loader.zip
In the example, run.bat generates the Javascript file and opens index.html, so you needn't open index.html yourself.
NOTE: .bat is an executable type in Windows, so open them in a text editor before running if you are downloading from some random internet link like this one.
If you are running Linux or OSX, you can probably do something similar to the batch file and produce a correctly formatted javascript string without any of the mlString faff.
You can't do this automatically. Your JS can't see the files in the same directory as it.
Easiest is probably to give a list of those image names to your JavaScript.
Otherwise, you might be able to fetch a directory listing from the web server using JS and parse it to get the list of images.
In jQuery you can use Ajax to call a server-side script. The server-side script will find all the files in the folder and return them to your html file where you will need to process the returned information.
You can use the fs.readdir or fs.readdirSync methods to get the file names in the directory.
The difference between the two methods, is that the first one is asynchronous, so you have to provide a callback function that will be executed when the read process ends.
The second is synchronous, it will returns the file name array, but it will stop any further execution of your code until the read process ends.
After that you simply have to iterate through the names and using append function, add them to their appropriate locations. To check out how it works see HTML DOM and JS reference
Add the following script:
<script type="text/javascript">
function mlString(f) {
return f.toString().
replace(/^[^\/]+\/\*!?/, '');
replace(/\*\/[^\/]+$/, '');
}
function run_onload() {
console.log("Sample text for console");
var filenames = g_FOLDER_CONTENTS.match(/\S+/g);
var fragment = document.createDocumentFragment();
for (var i = 0; i < filenames.length; ++i) {
var extension = filenames[i].substring(filenames[i].length-3);
if (extension == "png" || extension == "jpg") {
var iDiv = document.createElement('div');
iDiv.id = 'images';
iDiv.className = 'item';
document.getElementById("image_div").appendChild(iDiv);
iDiv.appendChild(fragment);
var image = document.createElement("img");
image.className = "fancybox";
image.src = "images/" + filenames[i];
fragment.appendChild(image);
}
}
document.getElementById("images").appendChild(fragment);
}
</script>
then create a js file with the following:
var g_FOLDER_CONTENTS = mlString(function() { /*!
1.png
2.png
3.png
*/});
Using Chrome, searching for the images files in links (as proposed previously) didn't work as it is generating something like:
(...) i18nTemplate.process(document, loadTimeData);
</script>
<script>start("current directory...")</script>
<script>addRow("..","..",1,"170 B","10/2/15, 8:32:45 PM");</script>
<script>addRow("fotos-interessantes-11.jpg","fotos-interessantes-> 11.jpg",false,"","");</script>
Maybe the most reliable way is to do something like this:
var folder = "img/";
$.ajax({
url : folder,
success: function (data) {
var patt1 = /"([^"]*\.(jpe?g|png|gif))"/gi; // extract "*.jpeg" or "*.jpg" or "*.png" or "*.gif"
var result = data.match(patt1);
result = result.map(function(el) { return el.replace(/"/g, ""); }); // remove double quotes (") surrounding filename+extension // TODO: do this at regex!
var uniqueNames = []; // this array will help to remove duplicate images
$.each(result, function(i, el){
var el_url_encoded = encodeURIComponent(el); // avoid images with same name but converted to URL encoded
console.log("under analysis: " + el);
if($.inArray(el, uniqueNames) === -1 && $.inArray(el_url_encoded, uniqueNames) === -1){
console.log("adding " + el_url_encoded);
uniqueNames.push(el_url_encoded);
$("#slider").append( "<img src='" + el_url_encoded +"' alt=''>" ); // finaly add to HTML
} else{ console.log(el_url_encoded + " already in!"); }
});
},
error: function(xhr, textStatus, err) {
alert('Error: here we go...');
alert(textStatus);
alert(err);
alert("readyState: "+xhr.readyState+"\n xhrStatus: "+xhr.status);
alert("responseText: "+xhr.responseText);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

jquery countdown in dynamically created html

i need a little help using the jquery countdown keith wood - jquery countdown plugin
I am creating several countdowns by retrieving data from mysql database (php ajax call) and putting it into a div:
in php (getdetails.php -> gets $mid and $time from mysql-database):
$mrow="TimeCounter inserted here:"
$mrow.="<div id=\"RowDiv\"><div id=\"timecount".$mid."\"><script> $('#timecount".$mid."').countdown({until: ".$time."}); </script></div></div>";
$mrow.="TimeCounter ends here";
in JS i set the innerHTML with the data i got:
var url="getDetails.php";
var what="getTimeData";
console.log("call getTimeData");
var p1 = $.post(url,{what:what,selId:selValue,conName:"GId"});
p1.done(function(data){
console.log("Data -> : "+ data);
document.getElementById("CounterDiv").innerHTML=data
});
console.log(data) shows me the set html:
<div id="RowDiv" ><div id="timecount2"><script> $('#timecount2').countdown({until: 1454713200}); </script></div></div>
I get no errors but i dont see the counter... I do see the surrounding TimeCounter inserted here: TimeCounter ends here on the page. I suppose it is a client / server side issue. Maybe i need to call the function again after setting the innerHTML with the data. But i dont know how.
How can i solve this? Any ideas?
Instead of adding an inline script within your HTML element, you can initiate the counter within your callback/success function of jQuery.post(). In order to do this, you will have to change your PHP and JS like below:
PHP
$mrow="TimeCounter inserted here:"
$mrow.="<div id=\"RowDiv\"><div id=\"timecount" . $mid . "\" data-time=\"" . $time . "\"></div></div>";
$mrow.="TimeCounter ends here";
JS
var url = "getDetails.php",
what = "getTimeData";
$.post(url, {what:what,selId:selValue,conName:"GId"}, function(data){
$('#CounterDiv').html(data).find('[id^="timecount"]').countdown({until: $(this).data('time')*1});
});
UPDATE:
I don't know the plugin, but the scope of this might get changed when .countdown() is called. In such a case, you can use .each() function of jQuery to pass the element. Here is how you do that:
$.post(url, {what:what,selId:selValue,conName:"GId"}, function(data){
var $counters = $('#CounterDiv').html(data).find('[id^="timecount"]'),
$el,t;
$counters.each(function(index,element){
$el = $(element);
t = $el.data('time')*1;
$el.countdown({until: t});
});
});
Haven't tested the code but the point of my suggestion would be to avoid sending HTML in response and make getdetails.php respond with $mid and $time like:
$data = array(
'mid' => $mid,
'time' => $time
);
$response = json_encode($data);
Your JS code should look something like:
var url = "getDetails.php";
var what = "getTimeData";
console.log("call getTimeData");
$.post(url, {what: what, selId: selValue, conName: "GId"}, function (data) {
console.log("Data -> : " + data);
var id = 'timecount' + data.mid;
var row = '<div id="RowDiv"><div id="' + id + '"></div</div>';
$("#CounterDiv").html(row);
$('#' + id).countdown({until: data.time});
}, 'json');

Send a string from javascript to php (in the same file)

So basically, I got a php file where I create a script in the header.
In this script, I take the value of two textbox with document.getElementByID and I concatenate them in a variable. But now, in the same script, I want to send that var to a php section to use it.
I tried the ajax way, but since the php and the javascript is in the same file, it make an error.
Here is what the script section looks like :
IN FILE.PHP
<script type="text/javascript">
rowNum = 0;
function some_function()
{
var command = "somebasiccommand";
if(document.getElementById("text_1").value != "" && document.getElementById("text_2").value != "")
{
command += " " + document.getElementById("text_1").value + " " + document.getElementById("text_2").value;
}
<?php
$parameter = command; <----- obviously not working, but that's basically what im looking for
$output = exec("someExecutable.exe $parameter");
(...)
?>
}
</script>
EDIT 1
So here it is, I tried to use ajax this time, but this isn't working, seems like i miss something. Here is the server.php:
<?php
$parameter = $_POST['command'];
$output = exec("someexecutable.exe $parameter");
$output_array = preg_split("/[\n]+/", $output);
print_r($parameter);
?>
And here is my ajax call in my client.php (in a js script):
var command = "find";
if(document.getElementById("text_1").value != "" && document.getElementById("text_2").value != "")
{
command += " " + document.getElementById("text_1").value + " " + document.getElementById("text_2").value;
}
var ajax = new XMLHttpRequest;
ajax.open("POST", "server.php", true);
ajax.send(command);
var output_array = ajax.responseText;
alert(output_array);
For some reason, it doesn't go farther then the ajax.open step. On the debugger console of IE10, i got this error : SCRIPT438: Object doesn't support property or method 'open' .
You are trying to run a serverside script in your ClientSide script,
that's never going to work.
https://softwareengineering.stackexchange.com/questions/171203/what-are-the-differences-between-server-side-and-client-side-programming
If you want to do something with the data from text_1 and text_2, you should create a php file that can handle a post/get request via AJAX or a simple submit, featuring the data from those elements, and make it return or do whatever it is you want it to end up doing.
You can't use javascript variable (client) from php (server). To do that, you must call ajax.
<script type="text/javascript">
rowNum = 0;
function some_function()
{
var command = "somebasiccommand";
if(document.getElementById("text_1").value != "" && document.getElementById("text_2").value != "")
{
command += " " + document.getElementById("text_1").value + " " + document.getElementById("text_2").value;
}
//AJAX call to a php file on server
//below is example
var ajax = window.XMLHttpRequest;
ajax.open("POST", "yourhost.com/execute.php", true);
ajax.send(command);
}
</script>
And this is execute.php on server
<?php
$parameter = $_POST['command'];
$output = exec("someExecutable.exe $parameter");
(...)
?>
Alright... I pretty much changed and tested many things and I found out that the problem was the async property of the .send command. I was checking the value of the respondText too fast. Putting the third property of .open to false made the communication sync, so I receive the infos properly. I got another problem right now, but its not the same thing, so I will do another post.

PHPExcel Download and JS returns on form.submit

I'm calling a PHP Script to genereta an excel file and then download it on the fly
header('Content-Type: application/vnd.ms-excel');
header("Content-Disposition: attachment;filename=iva.xls");
$objWriter = new PHPExcel_Writer_Excel5($objPHPExcel);
$objWriter->save('php://output');
After this code I finish with:
$aReturn[]= array('result'=>true);
exit(json_encode($aReturn));
At the first moment I start calling this PHP using a submit button... then (trying to get a progress bar) I decided to call this php using javascript with following code:
$.messager.progress();
var urlProtax="taxes/processtax.php?start=" + cStartDate + '&end='+ cEndDate ;
$('#taxesForm').form('submit',{
url: urlProtax,
onSubmit: function(datt){
var isValid = $(this).form('validate');
if (!isValid){
$.messager.progress('close');
}
return isValid;
},
success: function(jdatos){
alert('alert data '+ jdatos);
data = eval('('+jdatos+')');
if(data[0]['result']===true){
$.messager.progress('close');
$('#taxesWin').window('close');
return true;
}else{
$.messager.progress('close');
var iderror = data[0]['error'];
$.messager.alert("ERROR (" + iderror +")" , gt.gettext('Unknown Error'), 'error');
$('#taxesWin').window('close');
}
},
error: function(xhr) {
alert('Error! Status = ' + xhr.status);}
});
Excel file is being created fine!!! but I never get the json response to close progress bar.
Kind Regards,
Excel files are binary, JSON doesn't support binary formats directly.
You might have better luck if you use an ascii format like CSV

calling JQuery HTTP GET request inside javascript function

I will start off by saying I am new to Javascript and JQuery. What I want to accomplish is have a submit button on an HTML page that will call the dbQuery function in my .js file that will print the value of variables to the screen and then add them into a MySQL database.
I need to use the JavaScript variable selectedVisibleValue that is defined in my first function dbQuery The reason I want to do this is because I have four drop downs, three of which are hidden drop downs that are only shown depending on the first non hidden dropdown, only one of the hidden drop downs is ever visible.
I want to work with these variables in my PHP page formPage to do the Database functions. My code is below I want to add the testing1 function into the dbQuery function.
I have tried just copying and pasting it into the dbQuery function but it does not work. I am not trying to work with the selectedVisibleValue in the code below. I am just trying to do some testing with some bogus variables.
var dbQuery = function(){
var description = document.getElementById("jobDescription").value;
var selectedEquip = document.getElementById("equipmentList");
var selectedEquip1 = selectedEquip.options[selectedEquip.selectedIndex].text;
var selectedVisibleValue = $(".unitDropDowns select:visible").val();
document.getElementById("descriptionSummary").innerHTML = "<h3>Description</h3>" + "<p>" + description + "</p>";
document.getElementById("equipmentRan").innerHTML = "<h3>Equipment Ran </h3>" + "<p>" + selectedEquip1 + "</p>" + "<h3>Unit Number</h3>" + "<p>" + selectedVisibleValue + "</p>";
document.getElementById("equipmentRan").style.display = "block";
document.getElementById("descriptionSummary").style.display = "block";
}
var testing1 = function() {
$.get(
"formPage.php",
{paramOne : 123, paramX : 'abc'},
function(data) {
document.getElementById("equipmentRan").innerHTML = ('page content: ' + data);
}
);
}
//cache references to static elements
var jobDescription = $('#jobDescription')
, selectedEquip = $('#equipmentList')
, descriptionSummary = $('#descriptionSummary')
, equipmentRan = $('#equipmentRan')
;
function dbQuery(){
//gather params
var params = {
jobDescription : jobDescription.val(),
selectedEquip1 : selectedEquip.val(),
selectedVisibleValue = $(".unitDropDowns select:visible").val()
}
//show summary
descriptionSummary.html('<h3>Description</h3><p>'+description+'</p></h3>').show();
equipmentRan.html('<h3>Equipment Ran</h3><p>'+selectedEquip1+'</p><h3>Unit Number</h3><p>'+selectedVisibleValue+'</p>').show();
//do a get
$.get('formPage.php',params,function(data) {
equipmentRan.html('page content: ' + data);
}
}
jsFiddle DEMO
Passing variables between functions might come in useful for your project.
HTML:
<div id="theBox"></div>
<button>Press Me</button>
JS
$(document).ready(function() {
// This is some other Do More function, defined prior to the next variable function.
// This is your .get() request.
function doMore(target){
// For the incomming targer, add a class style of a larger font.
$(target).css('font-size', 30);
}
// The main function.
var dbQuery = function() {
// Show dynamic text on the HTML page.
var extra = $('#theBox').html('Dynamic Text Results');
// Run some other function, also... send the private variable in use.
doMore(extra);
};
// The submit button.
$('button').on('click', function() {
// Start the function.
dbQuery();
});
});
Here is the working code:
function dbQuery() {
window.description = document.getElementById("jobDescription").value;
var selectedEquip = document.getElementById("equipmentList");
window.selectedEquip1 = selectedEquip.options[selectedEquip.selectedIndex].text;
window.selectedVisibleValue = $(".unitDropDowns select:visible").val();
testing1();
}
function testing1() {
$(document).ready(function() {
$.get(
"formPage.php",
{paramOne : window.selectedVisibleValue, paramX : window.description, paramY : window.selectedEquip1},
function(data) {
document.getElementById("equipmentRan").innerHTML = (data);
}
);
});
}

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