I've been working on a progressive web app, but I've noticed that unlike native apps, it doesn't produce tap sounds even if my phone has them enabled. For example, on my Android phone when I click an email it makes a little sound or vibrates.
Is there any way to access this API when building a web app or is this one of the limits of non-native app development?
i shall explain using jquery
<script>
var tapsound = new Audio('click_sound.mp3');
$(document).ready(function(){
$("#upload").click(function(){
tapsound.play();
});
});
</script>
<button id="upload">Upload</button>
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I have an express server that serves my angular front end at http://localhost:9000
I'm using electron as a desktop client.
I want to force users to view the application through electron and only through electron. I don't want users to have the ability to browser the application through any other browser.
Is there any way to disable the ability to access the app through a regular browser?
I've attempted to find information regarding this but have come up short.
EDIT: This can only be done on the client side
You can check if the window.process object exists.
if (window.process && window.process !== undefined) {
// Likely electron
}
I don't know if it's related, but is it possible for you not to use localhost? I found that after building angular parts (with ng run build) and referencing them in electron's main.js there was no need for local server to be running (but so far I only stuffed angular's quickstart into electron shell)
I'm trying to build my app with React and Node (Isomorphic Rendering Architecture). I found on github example project but i have problem. I would like to develop my project client and server together, that the same Component can gets data/actions whataever from client nad server simultaneously. For example:
var Component = React.createClass({
render: function() {
return (
<div className="commentBox">
{this.props.client}
{this.props.server}
</div>
);
}
});
You can see that, Component gets props from client and server together. How i can do this?
I tryed 3 github projects but always i can't implement it. I dont know why. of course it's working when i render Component only by server or only by client but it's not working together.
For example when I render Component by server i can't make any actions specific for client (onclick alerting etc.) . So that's why it's important for me. Rendering some data from server and makes some client actions. But together, still on the same Component.
I'm sorry for my poor english!
Jan, it's impossible to do this using React.
They don't work "at the same time".
The server-side React code works by building the HTML page as a text-string, and serving the HTML text to the client.
After the browser loads the page, the React code in the browser will attach itself to the React code that was put on the page (because the server prints out IDs for all of the components, for the browser to attach to, after).
The goal, then, is to feed data to components, instead of expecting to have access to both the browser and the server at the same time.
That way, you can use server-side code to get data for the component, and you can use client-side code to get data for the component, and the component won't care.
This is not quite valid React, or the right way to do JS, in general but have a look:
class ServerElement {
render ( ) {
// sync calls should rarely ever (ideally never, other than booting up) be used
var articles = db.syncGetArticles();
return <Articles articles={ articles } />;
}
}
class BrowserElement {
render ( ) {
// isn't real, and should never be used even if it was
var articles = ajax.sync("GET", "/articles");
return <Articles articles={ articles } />;
}
}
The important part here is not the Server or Browser element (like I said, that's not really going to work), but rather that the <Articles /> element isn't expecting a server or a browser; it's expecting a list of articles.
The benefit of this approach, then, is that the server builds the HTML, but before the page is served, it's pre-filled with data, which will later be updated (replaced or added to) on the browser.
I hope that helps; if it doesn't, ask away, and I'll try to add to the answer.
#Norguard Thank you for your comprehensive answer. I am trying to own your answer. I know that your example code is not valid for React/JS cuz we have to build our db actions in models area. But one thing puzzles me. We are sending API with our '/articles' and gets data from this. OK, its cool, but this is still public data. I wonder about the private data. How to use React Isomorphic to get specific data or server if/else condition to build better app.
If we are using client-side templating language (like ejs) it's very easy. We are building our .html file and injection server methods(or whatever) to specific tags for templating language. How do to the same in React server? I can't imagines this using components and server.
I think that I understand idea you showed me but need time to efficiently build Isomorphic app using React.
I have a mobile website (on a remote server) made with jquery mobile (front-end) and laravel backend. In phonegap i have made an app that opens a browser and displays the mobile website.
In the mobile website i have two buttons:
[Mobile upload]
[Normal upload]
The normal upload button chooses an image from from your computer with laravel(or some other framework).
The Mobile upload buttons needs to call the phonegap camera. So the user can select a image from the phone. Then using file transfer send it to the site again.
Is this possible to call Phonegap functions from a website inside the browser?
And what is the best way to approach this?
To access the camera roll on your phone, you just need to create a normal file input.
<input type="file" id="fileProfileImage" accept="image/*" capture />
On iPhone you can use image/* to select only images.
In your JS code, I will suggest you to use this plugin: https://github.com/blueimp/jQuery-File-Upload
It can upload files cross domain. I don't know anything about laravel, but you will have to create a CORS enabled webservice that can handle your upload request. I've done it in .net, and its a pain to get work correctly.
Here are the JS code I use to upload my files in phonegap (with the plugin I linked to):
$('#fileProfileImage').fileupload(
{
url: "WEBSERVICE URL",
dataType: 'json',
//forceIframeTransport: true,
formData: { someProp: "someVal" },
start: function (e, data)
{
},
done: function (e, data)
{
},
progressall: function (e, data)
{
var progress = parseInt(data.loaded / data.total * 100, 10);
$("#alert p span").text(progress); //this shows the progress in %
},
fail: function (e, data)
{
}
});
The code is not phonegap specific. It can be implemented in every browser, and it works well in phonegap.
I'm trying to find out whether it's possible to invoke node.js functions from a web page. Is there any way to make node.js functions accessible from Google Chrome (so that they are run on the node.js server), as shown here?
(I'm aware that it's possible to do this using node-webkit (a non-standard Chromium implementation) without modifying the code, but I'd prefer to do this using an unmodified browser, which will require the code shown below to be modified in some way.)
<html>
<body>
<script type = "text/javascript">
var exec = require('child_process').exec; //node.js function
</script>
<p onclick = "exec('firefox')">
Click here to launch the Firefox web browser.
</p>
</body>
</html>
No, this is not possible, for clear security reasons.
You only have available to you what the browser gives you. node-webkit is the closest thing available, and does not meet your requirements.
NW has own method like node exec :
var gui = require('nw.gui');
gui.Shell.openItem('firefox', ,function(error, stdout, stderr) { });
Is there a way to check iOS to see if another app has been installed and then launched? If memory serves me this was not possible in early versions but has this been changed?
Doable, but tricky.
Launching installed apps, like the FB or Twitter apps, is done using the Custom URL Scheme. These can be used both in other apps as well as on web sites.
Here's an article about how to do this with your own app.
Seeing if the URL is there, though, can be tricky. A good example of an app that detects installed apps is Boxcar. The thing here is that Boxcar has advanced knowledge of the custom URL's. I'm fairly (99%) certain that there is a canOpenURL:, so knowing the custom scheme of the app you want to target ahead of time makes this simple to implement.
Here's a partial list of some of the more popular URL's you can check against.
There is a way to find out the custom app URL : https://www.amerhukic.com/finding-the-custom-url-scheme-of-an-ios-app
But if you want to scan for apps and deduce their URL's, it can't be done on a non-JB device.
Here's a blog post talking about how the folks at Bump handled the problem.
There is a script like the following.
<script type="text/javascript">
function startMyApp()
{
document.location = 'yourAppScheme://';
setTimeout( function()
{
if( confirm( 'You do not seem to have Your App installed, do you want to go download it now?'))
{
document.location = 'http://itunes.apple.com/us/app/yourAppId';
}
}, 300);
}
</script>
Calling this script from the web (Try to start MyApp), you can determine if your app with scheme "yourAppScheme" is installed on the device or not.
The App will launch if it is installed on the device and "yourAppScheme" is registered in it.
If the app is not installed you can suggest the user to install this app from iTunes.
To check if an app is installed (e.g. Clear):
BOOL installed = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:#"clearapp://"]];
To open that app:
BOOL success = [[UIApplication sharedApplication] openURL:[NSURL URLWithString:#"clearapp://"]];
Hides the error message if the app is not installed
At Branch we use a form of the code below--note that the iframe works on more browsers. Simply substitute in your app's URI and your App Store link.
<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">
window.onload = function() {
// Deep link to your app goes here
document.getElementById("l").src = "my_app://";
setTimeout(function() {
// Link to the App Store should go here -- only fires if deep link fails
window.location = "https://itunes.apple.com/us/app/my.app/id123456789?ls=1&mt=8";
}, 500);
};
</script>
<iframe id="l" width="1" height="1" style="visibility:hidden"></iframe>
</body>
</html>
There's a second possibility that relies on cookies first and the javascript redirect only as a fallback. Here's the logic:
When a user without the app first taps on a link to your app, he or she is redirected straight to the App Store. This is accomplished by a link to your app actually being a dynamically-generated page on your servers with the redirect. You create a cookie and log a "digital fingerprint" of IP address, OS, OS version, etc. on your backend.
When the user installs the app and opens it, you collect and send another "digital fingerprint" to your backend. Now your backend knows the link is installed On any subsequent visits to links associated with your app, your servers make sure that the dynamically-generated redirect page leads to the app, not the App Store, based on the cookie sent up with the request.
This avoids the ugly redirect but involves a ton more work.
To my understanding, because of privacy issues, you can't see if an app is installed on the device. The way around this is to try and launch the app and if it doesn't launch to have the user hit the fall back url. To prevent the mobile safari error from occurring I found that placing it in an iframe helps resolve the issue.
Here's a snippet of code that I used.
<form name="mobileForm" action="mobile_landing.php" method="post">
<input type="hidden" name="url" value="<?=$web_client_url?>">
<input type="hidden" name="mobile_app" value="<?=$mobile_app?>">
<input type="hidden" name="device_os" value="<?=$device_os?>">
</form>
<script type="text/javascript">
var device_os = '<? echo $device_os; ?>';
if (device_os == 'ios'){
var now = new Date().valueOf();
setTimeout(function () {
if (new Date().valueOf() - now > 100)
return;
document.forms[0].submit(); }, 5);
var redirect = function (location) {
var iframe = document.createElement('iframe');
iframe.setAttribute('src', location);
iframe.setAttribute('width', '1px');
iframe.setAttribute('height', '1px');
iframe.setAttribute('position', 'absolute');
iframe.setAttribute('top', '0');
iframe.setAttribute('left', '0');
document.documentElement.appendChild(iframe);
iframe.parentNode.removeChild(iframe);
iframe = null;
};
setTimeout(function(){
window.close()
}, 150 );
redirect("AppScheme");
I struggled with this recently, and here is the solution I came up with. Notice that there is still no surefire way to detect whether the app launched or not.
I serve a page from my server which redirects to an iPhone-specific variant upon detecting the User-Agent. Links to that page can only be shared via email / SMS or Facebook.
The page renders a minimal version of the referenced document, but then automatically tries to open the app as soon as it loads, using a hidden <iframe> (AJAX always fails in this situation -- you can't use jQuery or XMLHttpRequest for this).
If the URL scheme is registered, the app will open and the user will be able to do everything they need. Either way, the page displays a message like this at the bottom: "Did the app launch? If not, you probably haven't installed it yet .... " with a link to the store.