javascript objects - Page 43

Passing parameters to Javascript using PHP

- by ayush

I have the following line of code: <a href="javascript:;" onClick="tweeet('myid')">My Tweets!</a> Now while this is working perfectly fine the following line is not: <a href="javascript:;" onClick="tweeet(<?php echo 'myid'; ?>)">My Tweets!</a> Can anyone help me out why it is not working and suggest any changes? The variable I want to pass to the Javascript function is a PHP variable. I have tried the PHP with single quotes and double quotes but it is not working.

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Starting Javascript

- by user288245

Hi guys, a couple of questions (never done javascript before). Below is part of the what happens on submit, what is something, the action, the php script its sent to? Also is there any software you guys reccomend for checking you're javascript, like the equivalent of an ide? im using notepad++. Is the rest the right sort of idea? I'm using several else ifs for each method, checking valid == true. <SCRIPT LANGUAGE="JavaScript"> <form action="something" onsubmit="return ok()"> function ok() { if (validate_Info() == false) { alert('Please enter a name'); return false; } else if else if

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Problem using Javascript to redirect to a URL with a query string

- by Jordan Pagaduan

Javascript <script type="text/javascript"> function Edit(id) { if(confirm("Are you sure to edit?")==true) { location.href='employee_set.php&edit='+id; } } </script> PHP <?php if(isset($_GET["edit"])==false) { echo "no response"; } else { echo "link success"; } ?> My problem is the Javascript is OK. The location href example. http://localhost/employee_set.php&edit=30 ... The PHP code is not working. Error is not found.

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Ruby on Rails - Send JavaScript to view

- by Eef

Hey, I am creating a website in Ruby on Rails. I have a controller action that renders a view like so: def show time_left = Time.now.to_i - 3.hours.to_i @character = current_user.characters.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @character } end end This is fine as it renders the show.html.erb as I like. I would like however to somehow pass time_left to the view as a Javascript variable as this value is use by a countdown JQuery plugin. I could put a javascript block on the page in the HTML and print a instance variable out like so: <script type="javascript"> $('#countdown').countdown('<%= @time_left =>')</script> But I would like to keep all my JS in a external file and off the page could anyone give some advice on how to implement this? Cheers Eef

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Global variables in Javascript across multiple files

- by Goro

Hello, A bunch of my JavaScript code is in an external file called helpers.js. Inside the HTML that calls this JavaScript code I find myself in need of knowing if a certain function from helpers.js has been called. I have attempted to create a global variable by defining: var myFunctionTag = true; In global scope both in my HTML code and in helpers.js. Heres what my html code looks like: <html> ... <script type='text/javascript' src='js/helpers.js'></script> ... <script> var myFunctionTag = false; ... //I try to use myFunctionTag here but it is always false, even though it has been se t to 'true' in helpers.js </script> Is what I am trying to do even doable? Thanks,

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How to show / hide multiple elements at the same time with javascript

- by DerNalia

So, I have this between my head tags <script type="text/javascript"> hidden_links = document.getElementsByName("javascript_needed"); for (i = 0; i < hidden_links.length; i++) { hidden_links[i].style.display = "visible"; } </script> And my divs are all similar to <div name="javascript_needed" style="display: none;">stuff</div> the overall goal here, is to have these divs hide when javascript is disabled, and re-enable them when javascript is enabled.... but for whatever reason, my code doesn't work. I ever tried it in the webkit console, and nothing errored =\

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UIWebView not evaluating javascript properly

- by jammur

I'm trying to run some javascript against a UIWebView but it's doesn't seem to be working. For example, here is a snippet of html I'm using to test: <html><body><h1>Hello World!</h1><p>It's me.</p></body></html> If I run the following javascript against it, the return value is 0, when it should be 1. var elements = document.getElementsByTagName("h1"); elements.length; Here's the objc code I'm using for the webview. 'parser' is a string containing the above javascript: [webView loadHTMLString:@"<html><body><h1>Hello World!</h1><p>It's me.</p></body></html>" baseURL:nil]; NSString *markupResult = [webView stringByEvaluatingJavaScriptFromString:parser];

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Convert PHP date into javascript date format

- by LeeTee

I have a PHP script that outputs an array of data. This is then transformed into JSON using the json_encode() function. My issue is I have a date within my array and its is not in the correct javascript format. How can I convert this within PHP so it is? $newticket['ThreadID'] = $addticket; $newticket['Subject'] = $subject; //$newticket['DateCreated'] = date('d-m-Y G:H'); Instead of the above fo rthe date I need the equivilant of the javascript function new Date() When I output the above I get the following "Fri Jun 01 2012 11:08:48 GMT+0100 (GMT Daylight Time)" However, If I format my PHP date to be the same, javascript rejects it. Confused... Can anyone help?

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Javascript form validation - multiple form fields larger than 0

- by calebface

function negativeValues(){ var myTextField = document.getElementById('digit'); if(myTextField.value < 0) { alert("Unable to submit as one field has a negative value"); return false; } } Above is a Javascript piece of code where every time a field id 'digit' has a value that's less than 0, than an alert box appears either onsubmit or onclick in the submit button. There are about 50 fields in the form that should be considered 'digit' fields where they shouldn't be anything less than 0. What should I change with this Javascript to ensure that all 'digit' like fields have this alert box pop up? I cannot use jquery/mootools for validation - it has to be flat Javascript. Thanks.

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Implement a calender with Ruby and Javascript in Rails

- by samuel02

I'm trying to implement a calendar with Ruby and Javascript in Rails. I'm using a calendar helper that creates a calendar with given year and month and events as parameters (<%= calendar(:year => 2012, :month => 4, :events => @events %>). I also have three buttons next, today and previous with which the user should be able to navigate the calendar with. I am also going to implement some js that makes it possible to select dates in the calendar. So what I would like to do is to insert the calendar in the DOM with javascript in order to generate a new calendar when the user clicks one of the buttons. That way I will be able to control the behavior of the buttons and add the select functionality. The problem is that I can't just insert my erb code in a javascript plus I'm not even sure it's the right way to go? Any suggestions are appreciated!

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Just a random basic OO javascript qn

- by Reno Yeo

I am coding an external Javascript slideshow file, which i want to load and display on my HTML/CSS webpage. How do i go about doing that? I understand that i need to load the .js file in the header of the HTML, but what do i call inside the body's DIV that will make the javascript file understand that i want it to load at that area? I'm extremely confused with working with Javascript here. If anyone has any helpful links to implementing a complete slideshow on a webpage it would be appreciated as well.

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javascript singleton question

- by Shawn

I just read a few threads on the discussion of singleton design in javascript. I'm 100% new to the Design Pattern stuff but as I see since a Singleton by definition won't have the need to be instantiated, conceptually if it's not to be instantiated, in my opinion it doesn't have to be treated like conventional objects which are created from a blueprint(classes). So my wonder is why not just think of a singleton just as something statically available that is wrapped in some sort of scope and that should be all. From the threads I saw, most of them make a singleton though traditional javascript new function(){} followed by making a pseudo constructor. Well I just think an object literal is enough enough: var singleton = { dothis: function(){}, dothat: function(){} } right? Or anybody got better insights? [update] : Again my point is why don't people just use a simpler way to make singletons in javascript as I showed in the second snippet, if there's an absolute reason please tell me. I'm usually afraid of this kind of situation that I simplify things to much :D

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Does HTML5 make Javascript gaming safer (more secure)?

- by Sean Madigan

I know that Javascript is an incredibly unsecure way of programming a persistent game, where for instance you are doing battle calculations in an RPG and then award XP through linking to a PHP page when they win that adds XP to a database (since the player could make their own javascript to always win or just look at the PHP page that you get sent to when you win and just go there anyway). So with that said, I'm wondering if HTML5 makes multiplayer/persistent games any safer in this regard, since I know it still uses Javascript. Or am I still doomed to rely entirely on server-side scripting for doing any calculations that award the player?

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Using javascript to access a json array from php

- by celenius

I'm trying to understand how my php script can pass an array to my javascript code. Using the following php, I pass an array: $c = array(3,2,7); echo json_encode($c); My javascript is as follows: $.post("getLatLong.php", { latitude: 500000}, function(data){ arrayData = data document.write(arrayData) document.write(arrayData[0]); document.write(arrayData[0]); document.write(arrayData[0]); }); </script> What is printed out on screen is [3,2,7][3, I'm trying to understand how json_encode works - I though I would be able to pass the array to a variable, and then access it like a normal javascript array, but it views my array as one large text string. How do ensure that it reads it like an array?

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Will using https prevent client from accessing any confidential data inside JavaScript

- by saveing saving

I am working on an asp.net mvc web application, on the view i wrote the following JavaScript which calls an external web service :- <script type="text/javascript"> $(function() { $.getJSON("https://MyERPsystem.com/jw/web/json/hr/getsalary/byid?master_username=superadmin&password_hash=9449B5ABCFA9AFDA36B801351ED3DF66&employeeid=A200121", { //code goes here }, function(data) { $.each(data.items, function(i,item){ //code goes here }); }); }) </script> So if the external web service implements https, then does this means that the master_username and password_hash inside the javaScript cannot be seen by external users? Best Regards

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What's the cross-browser way to capture all single clicks on a button?

- by sany

What's the best way to execute a function exactly once every time a button is clicked, regardless of click speed and browser? Simply binding a "click" handler works perfectly in all browsers except IE. In IE, when the user clicks too fast, only "dblclick" fires, so the "click" handler is never executed. Other browsers trigger both events so it's not a problem for them. The obvious solution/hack (to me at least) is to attach a dblclick handler in IE that triggers my click handler twice. Another idea is to track clicks myself with mousedown/mouseup, which seems pretty primitive and probably belongs in a framework rather than my application. So, what's the best/usual/right way of handling this? (pure javascript or jQuery preferred)

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Freeing JavaScript object

- by pion

I am looking at the example from http://www.javascriptkit.com/javatutors/oopjs.shtml var person = new Object() person.name = "Tim Scarfe" person.height = "6Ft" But there is no mention how to "free" it in order to avoid memory leak. Will the following code free it? person = null; How do you free a JavaScript Object using "new Object()? How do you free a JavaScript Array allocated using "new Array(10)"? How do you free a JavaScript JSON allocated using "var json = {"width": 480, "height": 640}"? Thanks in advance for your help.

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String pattern matching in Javascript

- by kwokwai

Hi all, I am doing some self learning about Patern Matching in Javascript. I got a simple input text field in a HTML web page, and I have done some Javascript to capture the string and check if there are any strange characters other than numbers and characters in the string. But I am not sure if it is correct. Only numbers, characters or a mixture of numbers and characters are allowed. var pattern = /^[a-z]+|[A-Z]+|[0-9]+$/; And I have another question about Pattern Matching in Javascript, what does the percentage symbol mean in Pattern matching. For example: var pattern = '/[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}/';

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Learning 'dynamic' javascript bookmarklet

- by Seatbelt99

Little help for a javascript noob please... I have this in a .js file on my web server: Q=document.selection?document.selection.createRange().text:document.getSelection(); alert(Q); I highlight some text on a web page (tested with Chrome and firefox) and paste this into the address bar: javascript:(function(){vara=document.createElement('SCRIPT');a.type='text/javascript';a.src='http://automatethegame.com/js/test.js?';document.getElementsByTagName("head")[0].appendChild(vara)})(); it appears to do nothing. Any assistance or suggestions would be appreciated. thanks

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PHP / javascript live chat using too much bandwidth

- by David

So I am learning about javascript, so I am making a live chat system with PHP and javascript. I have it so the javascript refreshes the log (each message gets logged in a file on the server), and it refreshes every second. Im using firebug to monitor the resource usage, and I see under the net tab each times its updated, and the bytes add up really fast. I know I can change it to update less, but is there a way that when a user on the other end I'm talking to, when the send a message, it gets sent to the server, then an alert gets sent to me saying that the chatlog needs to update somehow. That way it only updates when the log is updated. let me know, thanks

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Click to make body text larger | JavaScript

- by Wayne

Please note this is just an example: <img src="img/normal-font.png" onclick="javascript:document.body.style.fontSize = '13px';" />   <img src="img/medium-font.png" onclick="javascript:document.body.style.fontSize = '14px';" />   <img src="img/large-font.png"onclick="javascript:document.body.style.fontSize = '15px';" /> The body text does indeed enlarge if I choose one of them, but what I like to include is remembering what option you've chosen by reading cookies. In fact, I have no experience in creating cookies in JS, only in PHP. Could someone come up with an example of how to make cookies the simpliest way remembering my option, but whenever someone clicks another one, it should get rid of the cookie that was last set, e.g. Cookie value has 15px, then should update it or remove it with a new cookie with a new value of 13px and so on. Thanks :)

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Hooking a synchronous event handler on a form submit button in JS

- by Xzhsh

Hi, I'm working on a security project in javascript (something I honestly have not used), and I'm having some trouble with EventListeners. My code looks something like this: function prevclick(evt) { evt.preventDefault(); document.loginform.submitbtn.removeEventListener('click',prevclick,false); var req = new XMLHttpRequest(); req.open("GET","testlog.php?submission=complete",false); req.send(); document.loginform.submitbtn.click(); //tried this and loginform.submit() } document.loginform.submitbtn.addEventListener('click',prevclick,false); But the problem is, the submit button doesn't submit the form on the first click (it does, however, send the http request on the first click), and on the second click of the submit button, it works as normal. I think there is a problem with the synchronization, but I do need to have the request processed before forwarding the user to the next page. Any ideas on this would be great. Thanks in advance.

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changing validation group of button with javascript on client side

- by haansi

hi, In a form I have multiple group of controls which are grouped using validation group property. I want to assign validation group to asp.Button dynamically on client side using javascript on the base of item selected in drop down list. Here is JavaScript which I am using, but it is not working. It shows validation group undefined but actually a default group is defined. Please advice me. thanks <script type="text/JavaScript"> function NextClicked() { var _ddlStatus = document.getElementById("<%=ddl.ClientID%>"); var _selectedIndex = _ddlStatus.selectedIndex; var _btn = document.getElementById("<%=btnNext.ClientID%>"); alert(_btn.ValidationGroup); // here in messge it shows undefiend, yet I have defiend a group in button as default. if (_selectedIndex == 1) { _btn.ValidationGroup = "G1"; } else if (_selectedIndex == 2) { _btn.ValidationGroup = "G2"; } }

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Javascript recursive data structure definition

- by Matt Bierner

I need to define a data structure recursively in Javascript. Here is a simple example of a circular linked list: // List a very simplified example of what the actual (non list) code does. function List(f, r) { return function(){ return [f, r]; }; } var head = List('a', List('b', List('c', head))); When this is executed, head in List 'c' is resolved to undefined, not List 'a' as I need. List is an example function that returns a function (It is not an Javascript list that I can append to). I tried to wrap the definition of head is a self executing named function, but that blew the stack when head was resolved. What is the Javascript style solution that I am overlooking?

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Server-side Javascript (aspx.cs) Attributes.Add Code to Change a Label's text

- by DFM

I am trying to change a label's text by using server-side javascript (onclick) and C# within the page_load event. For example, I would like to write something like the following: Label1.Attributes.Add("onclick", "Label2.text='new caption'") Does anyone know the correct code for this? Also, what is this type of code referred to; is it just javascript or javascript in C# or is there a specific name? Lastly, does a book or online resource exist that lists the choices of control.attributes.add("event", "syntax") code to use with C#? Thank you, DFM

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