So this function works fine, however everytime i refresh the page the WINNER (person1 to 4) changes, i want to save the output and have it FIXED so that it wont change everytime i refresh..
Basicly: There is a timer on my website and when it hits 0 , it should automaticly pick someone from the list as the winner... but the winner should appear on the website for everyone and stay there
function randomNavn(){
document.getElementById("utskrift").innerHTML = "";
for (i = 0; i < 1; i++){
randName.push(nname.splice(Math.floor(Math.random() * nname.length), 1));
}
document.getElementById("utskrift").innerHTML = randName.join(", ");
}
var nname = ["Person1", "Person2", "Person3", "Person4"],
randName = [];
You need server-side code to do this -- and most likely a database. You can't do what you want from JavaScript. Each person's browser will run that javascript and get their own answer, bit it is only on their browser. Someone else will get a different answer, etc. That's not what you want to happen I assume.
To save data more permanently to be used in a web page, you have a few options:
Create a web service that accepts POST or PUT requests and saves the data on a server. This will allow you to share data between users.
Use a cookie. This will only save a value for each user's session. It won't share data between users.
You could use localStorage:
$window.localStorage.setItem('initData', {data: 'here'}
after some nights spent i've managed to found the perfect solution.
1) I've eliminated the javascript function for the array and instead craeted a php file where a winner or more is choosed.
2) From that php file we write the winners into a text file.
3) From that text file we read it through ajax and list it when countdown is over.
If anyone is ever in need, its good solution.
Thanks for everytning
Related
I am beginner in Javascript. I am currentlyworking on a Phonegap app with it. I am stuck in between as I have 4 html pages for signup process, and I have to pass all the html pages input value to single js file as in final all data must be POSTed to server URL and also I have read on many sites that they have recommended using same js file for all the pages of your site to speed up the site. So I have two problems to solve. I searched on many sites but could not find the accurate answer.
I need to pass 4 html page's input value to single js file.
I have to make single js file for both sign-in and sign-up.
My codes for JS page is:
var firstName="";
var lastName="";
var email="";
var password="";
var retypePassword="";
var gender="";
var DOB="";
var institute="";
var course="";
var branch="";
var semester="";
var teachers = [];
function signUpStarting() {
alert(firstName + " "+lastName+" "+email+" "+password+" "+retypePassword+" "+gender+" "+DOB+" "+institute+" "+course+" "+branch+" "+semester+" "+teachers.join(","));
}
function signUp1() {
firstName[0] = $("#first_name").val().trim();
firstName[1] = $("#last_name").val().trim();
email = $("#email").val().trim();
password = $("#password").val();
retypePassword = $("#retype_password").val();
alert(firstName + " "+lastName+" "+email+" "+password+" "+retypePassword);
}
function signUp2() {
gender = $('#gender').find(":selected").text();
DOB = $('#DOB').val();
alert(gender+" "+DOB);
}
function signUp3() {
institute = $('#institute').find(":selected").text();
course = $('#course').find(":selected").text();
branch = $('#branch').find(":selected").text();
semester = $('#semester').find(":selected").text();
alert(institute+" "+course+" "+branch+" "+semester);
}
function signUp4() {
$(":checkbox" ).map(function() {
if($(this).is(':checked')){
teachers.push($('label[for="' + this.id + '"]').text());
}
});
signUpStarting();
}
In html pages I am calling JS functions for each pages:
On first page:
<a onclick="signUp1()" href="register-two.html">continue</a>
On second page:
<a onclick="signUp2()" href="register-three.html">continue</a>
On third page:
<a onclick="signUp3()" href="register-four.html">continue</a>
On fourth page:
<a onclick="signUp4()">continue</a>
On each transaction from one page to next I have set alert in JS, and I am getting alert with accurate values also. But after clicking the continue button from fourth page of html, I transferred the code to main signup function. I tried to see alert in signUpStarting() function but there I am getting response of just fourth page values and other values are showing nothing as the variables are null.
I am not getting how to save variable values for always without using localStorage or cookies and POSTing all data to server.And I think this would have been easier if I would know to code for all html pages for my site to single JS file.
Please help me !
I am not getting how to save variable values for always without using localStorage or cookies and POSTing all data to server.And I think this would have been easier if I would know to code for all html pages for my site to single JS file.
This is exactly right. You cannot store data in memory between page loads in a web browser environment because all javascript variables are naturally destroyed when the browser navigates away from the page to a new page (even if they use the same javascript on both pages). Thus, you have to save it somewhere with more permanence: localStorage, cookies, or on the server via POST or GET.
What I would recommend is scrapping the four different html pages and simply using one html page that changes dynamically as the user fills in data. This way the browser will not eliminate data before you are ready to POST it to the server.
I have a multi-page form which uses php and javascript to capture and store the various values.
The form is working well apart from one issue which has left me stumped. At the third stage of the form there is an optional extras section which works as it should when something is selected, but if nothing is selected the previous value is not carried forward to the next stage.
I'm guesing it's because I'm using a click function - so if nothing is selected it falls over. How do I get around this?
$('.radio2').click(function() {
var servicecost = <?php echo json_encode($_POST['sum']); ?>;
var sum2 = parseInt(servicecost);
$('.radio2:checked').each(function() {
sum2 += parseFloat($(this).closest('div').find('.values').text());
});
$('#sum2').html(sum2);
$("input[name=sum3]").val(sum2);
});
The servicecost is the value of the selected options on the previous page.
Passing values extracted by script between pages can be acheived in a few ways.
Use HTML5 Local/Session Storage - however your pages should belong to the same domain.This requires a HTML5 enabled browser.
Use cookies (same domain policy again) and will not work if cookies are disabled.
Send the data through URL encoding.
POST the data to server and then send it back from server.
You are correct. As you have written the logic to print servicecost in click event, you will not be able to print the service cost from previous page. My suggestion would be,
You set the div sum2 when you arrive to the current form.
Note: Make sum2 as global so that you don't need to use POST..
May be,
$(document).ready( function () {
var servicecost = <?php echo json_encode($_POST['sum']); ?>;
var sum2 = parseInt(servicecost);
$('#sum2').html(sum2);
$("input[name=sum3]").val(sum2);
});
I got around this by hiding the Next button until an option is selected. I added a new option (No optional extras) with a value of 0 for users that don't require any and this got around the click function issue.
i'm quite new to javascript/jQuery/Json. i'm building myself a local app ( no client side for now). right now i have a simple form (inputs and submit) and would like to get the inputs from the user with javascrip/JQuery and then build a JSON object and store it on a file. i managed to get the inputs using jQuery ,and using JSON.strigify() i have a JSON object. only thing is that i dont know how to write to a file with JS. i searched for a solution and understand that i might need to use PHP for that as JS is not meant for changing files.
here is my code:
HTML form:
<form name="portfolio" id="portfolio" method="post" onsubmit="getform()">
<p>General</p>
Portfolio Name: <input type="text" id="portfolioName" name="portfolioName"><br>
Owner First Name: <input type="text" id="ownerFName" name="ownerFName"><br>
Owner Last Name: <input type="text" id="ownerLName" name="ownerLName"><br>
<p>Risk Management</p>
%stocks : <input type="text" id="stocksPerc" name="stocksPerc"><br>
<input type="submit" value="submit">
</form>
JS code
function getform() {
var portfolioName = document.portfolio.portfolioName.value;
var ownerFname = document.portfolio.ownerFName.value;
var ownerLname = document.portfolio.ownerLName.value;
var stocksPerc = document.portfolio.stocksPerc.value;
var myJsonObject =JSON.stringify({
"general": {
"portfolioName": portfolioName,
"ownerFname": ownerFname,
"ownerLname": ownerLname
},
"riskManagement": {
"stocksPerc": stocksPerc
}
});
alert(myJsonObject);
event.preventDefault();
};
now in "myJsonObject" i have the JSON object which i would like to write to a local file.
later on i would like to read this file ,and maybe update some of the values there.
can someone please help me understand how do i write it to a file ?
you can try and load this page which runs my code. hope it works for you.
note: programming is my area of interest but i didnt study it ,i'm learning all by myself so i'm sorry if i askqdo things that make you blind for a moment :). also this is the first question i post here ,feel free to say if i need to improve.
Thanks
Sivan
update + clarification : Thanks for the answers guys ,localStorage is something i didnt know about. from what i understand about localStorage its only good for working in a single domain/location. (i encountered this question on site). what if i want the option of running the app from different locations - lets say there will be only one person updating the JSON data, no need for sync/lock and stuff like that. right now my files (JS,JSON..) are saved in dropbox ,this is how i can use the app from different locations today , i dont have any other server.
2'nd update : i tried the localStorage solution i've been offered and even though its a great capability ,its not exactly what i'm looking for since i need the JSON data available in more then one location (i'll be using my desktop and my laptop for instance).
i'd be glad if you have other suggestions.
Thanks Again.
Check out the HTML5 localStorage API. You will be able to store your JSON objects there and retrieve them. They will be stored as key-value pairs. You can't write to a file using JS AFAIK.
Don't use a file as storage, use localStorage: http://diveintohtml5.info/storage.html. If you need to save information on a session scope, you should use sessionStorage, mind though that the latter is not persistant.
An example of how you would use it:
var item = {
"general": {
"portfolioName": portfolioName,
"ownerFname": ownerFname,
"ownerLname": ownerLname
},
"riskManagement": {
"stocksPerc": stocksPerc
}
}
// set item, you should think up of a unique key for each item
localStorage.setItem('your-key', item);
// remove it if no longer needed, you don't have a lot of space
localStorage.removeItem('your-key');
Saving files is possible in some browsers but this will probably be removed in the future - so I wouldn't use it unless you must.
This article shows how to -
http://updates.html5rocks.com/2011/08/Saving-generated-files-on-the-client-side
You can post the json to a server and use the server to generate a download file (ask a new question if thats what you seek)
and finally - are you sure you want to save to file? if all you want is to save and restore data then there are better alternatives (such as localStorage, cookies, indexDb)
I'm trying to display a progress bar during mass mailing process. I use classic ASP, disabled content compression too. I simply update the size of an element which one mimics as progress bar and a text element as percent value.
However during the page load it seems Javascript ignored. I only see the hourglass for a long time then the progress bar with %100. If I make alerts between updates Chrome & IE9 refresh the modified values as what I expect.
Is there any other Javascript command to replace alert() to help updating the actual values? alert() command magically lets browser render the content immediately.
Thanks!
... Loop for ASP mail send code
If percent <> current Then
current = percent
%>
<script type="text/javascript">
//alert(<%=percent%>);
document.getElementById('remain').innerText='%<%=percent%>';
document.getElementById('progress').style.width='<%=percent%>%';
document.getElementById('success').innerText='<%=success%>';
</script>
<%
End If
... Loop end
These are the screenshots if I use alert() in the code: As you see it works but the user should click OK many times.
First step is writing the current progress into a Session variable when it changes:
Session("percent") = percent
Second step is building a simple mechanism that will output that value to browser when requested:
If Request("getpercent")="1" Then
Response.Clear()
Response.Write(Session("percent"))
Response.End()
End If
And finally you need to read the percentage with JavaScript using timer. This is best done with jQuery as pure JavaScript AJAX is a big headache. After you add reference to the jQuery library, have such code:
var timer = window.setTimeout(CheckPercentage, 100);
function CheckPercentage() {
$.get("?getpercent=1", function(data) {
timer = window.setTimeout(CheckPercentage, 100);
var percentage = parseInt(data, 10);
if (isNaN(percentage)) {
$("#remain").text("Invalid response: " + data);
}
else {
$("#remain").text(percentage + "%");
if (percentage >= 100) {
//done!
window.clearTimeout(timer);
}
}
});
}
Holding respond untill your complete processing is done is not a viable option, just imagine 30 people accessing the same page, you will have 30 persistent connections to the server for a long time, especially with IIS, i am sure its not a viable option, it might work well in your development environment but when you move production and more people start accessing page your server might go down.
i wish you look into the following
Do the processing on the background on the server and do not hold the response for a long time
Try to write a windows service which resides on the server and takes care of your mass mailing
if you still insist you do it on the web, try sending one email at a time using ajax, for every ajax request send an email/two
and in your above example without response.flush the browser will also not get the % information.
Well, you don't.
Except for simple effects like printing dots or a sequence of images it won't work safely, and even then buffering could interfere.
My approach would be to have an area which you update using an ajax request every second to a script which reads a log file or emails sent count file or such an entry in the database which is created by the mass mailing process. The mass mailing process would be initiated by ajax as well.
ASP will not write anything to the page until it's fully done processing (unless you do a flush)
Response.Buffer=true
write something
response.flush
write something else
etc
(see example here: http://www.w3schools.com/asp/met_flush.asp)
A better way to do this is to use ajax.
Example here:
http://jquery-howto.blogspot.com/2009/04/display-loading-gif-image-while-loading.html
I didn't like ajax at first, but I love it now.
I'm trying to use HTML 5's local database feature on a Mac Dashboard widget.
I'm programming in Dashcode the following javascript:
if (window.openDatabase)
{
database = openDatabase("MyDB", "1.0", "Sample DB", 1000);
if (database)
{
...database code here...
}
}
Unfortunately the database-variable remains always null after the call to openDatabase-method. I'm starting to think that local databases are not supported in Widgets...
Any ideas?
/pom
No you will not be able to do the above. And even if you could then you would not be able to distribute the widget without distributing the database assuming it was a MySQL or SGLite. (not sure what you mean by HTML 5's local Db.
here are a number of ways round this:-
You can add a data source which can be a JSON file, or an XML file or and RSS feed. So to do this with JSON for example you would write a page on a server in PHP or something that accessed a database so that when the URL was called the result was a JSON string. Take the JSON string and parse it and use it in the Widget. This will let you get data but not save it.
Another way would be to use the user preferences. This allows you to save and retrieve data in the individual widget.
So
var preferenceKey = "key"; // replace with the key for a preference
var preferenceValue = "value"; // replace with a preference to save
// Preference code
widget.setPreferenceForKey(preferenceValue, preferenceKey);
You can then retrieve it with
var preferenceForKey = "key"; // replace with the key for a preference
// Preference code
preferenceForKey = widget.preferenceForKey(preferenceForKey);
The external call, you could also use REST will let you read any amount of data in and the preferences will let you save data for later reuse that will survive log out's and shut downs.
The Apple site has a lot of information about Widgets and tutorials as well thjat are worth working through.
Hope this helps.