JQuery :: Preventing Users Hijacking Calls?
Apr 14, 2011
I am building a user-based online application using jquery, and I am concerned about the possibility of users being able to hijack my ajax functions. I'm sure there is a standard way of dealing with this, but I don't know what it is.For example, if users are logged in,and want to send an instant message to each other, they can use a simple messaging system.An ajax call passes their message to a back-end handler script, like so:
$.ajax({
type: "POST",
url: "back-end-handler.php",
[code]....
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Dec 29, 2010
I have the following code that i am using to try and prevent users from entering non-numeric characters but it doesn't seem to work:
PHP Code:
function validate_onkeypress() {
a = String.fromCharCode(event.keyCode);
b = a.charCodeAt(0);
if (!validateString(b)) return false;
[Code]...
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May 18, 2010
i m working on a website. in which i m using a page which calls on index.php after that web address is called. as it has JS function which make index page open in popup. what i wanna do is now is that if someone (as many of us know root page 90% is index.php), if anyone enter index page directly. JS should check if that person came from redirect.php or not. if not, he will have some sort of error msg.
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Jan 5, 2012
I have a textbox and a button. When someone clicks the button, then the ajaxStop() event fires properly. However, when someone types in the textbox and hits the Enter key, the ajaxStop() event does not get fired. Here's the relevant code bits:
The textbox:
var keywords = document.createElement('input');
keywords.setAttribute('onkeyup', '$(this).keyup(function (e) { if (e.keyCode == 13) { $("#submit_button").click(); } })');
[Code]...
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May 11, 2010
Basically I want to prevent a user from moving to another field if the current one is invalid (non-numeric).I've tried a few things that I though would do the job, I've also tried using the change event with the last line (resetting the focus to the current element) but no dice.
jQuery('.setupprice, .monthlyprice, .quantity','#config_dialog').live('focusout',function(e)
{
var val = parseFloat(jQuery(this).val());
[code].....
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Jun 22, 2011
I have a form element that is readonly. <input type="text" id="kfs_acct_1" readonly="false" /> This field is dynamically populated an making it readonly prevents users from changing the value in this field. The problem I have is users click on the field and try to delete it's value. They click in the field and hit their Backspace key. This takes them away from the page to the page from whence they came. Because of the way the form is set up, doing this makes them loose all the data in the form (the one with the readonly box). How can I prevent the Backspace key from fireing and taking the user away from this page? I've tried a few things, but apparently making a field readonly keeps some key events from being seen.
[Code]...
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Jun 5, 2009
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=us-ascii" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.18702"></HEAD>
<BODY>
<DIV><FONT size=2 face="Trebuchet MS"><SPAN class=372450018-05062009>I have 6
links , each loads a form into its respective div. How can I disable the links if one of the 6 is clicked preventing a user from opening up 6 forms at
[Code]...
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Mar 26, 2010
You know how when you visit [URL] your browser jumps to #test1 automatically? Not talking about when you open page.html and THEN click an anchor to #test1. I mean typing the anchor explicitly at the end of the url before even visiting page.html. How do you prevent that jump? Just a sample scenario, to make sure I'm being extra clear:
[Code]./..
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May 6, 2010
I have some elements that hide and show real quick when I click on the same selected checkbox. I only want to hide or show something on change, and only when I need to. The way the behavior works now is I have 20 checkboxes, and each time I check one (even if it's the same), I see the associated elements hiding, then showing real quick. I don't want anything to happen though if all they do is toggle the checkbox, unless there's a condition to uncheck it. It's kind of hard to convey what I'm talking about here, but maybe my code can shed some light:[code]
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Aug 29, 2011
I have the following code which populates a combobox from an existing select field and then makes an AJAX call to a JSONP feed. This is all working and the dropdown list is populating however when I place the following code inside the AJAX call the combobox select function is not fired when the item is selected.
Code JavaScript:
return $("<li></li>").append("<a>" + item.label + results.id + "</a>").appendTo(ul);
[code]....
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Sep 4, 2009
Say I have a site that's centered on the page, and do $ ("#some_content").slideDown(). If the appearance of the new content means that the page no longer fits in the browser window, scrollbars will appear, and so the available page width decreases slightly, and so my centered content jumps left while it's sliding down. Is there a decent workaround for this? Best I can figure out at the moment is to persuade the browser to always display scrollbars, which isn't exactly ideal.
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Dec 5, 2011
Until now I have used the javascript function eval(), wrapped it in a try / catch block and showen him the error message if the javascript code was flawed.But this comes with the problem that if there is no error the script will be executed.So what I´d like to is use the jquery function globalEval(), wrap it in a try / catch block and display the error message if the script does not run sucessfully as I have done before,BUT:if the script would execute without an error I´d like to use some kind of preventDefault so that the script would not be executed at all and instead I could show the user a message that the script passed validation.I know that the way I propose is not possible as the script has to be executed somehow so that possible errors are generated...does anyone have an idea how to do what i propose ?
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Sep 30, 2010
This is such a simple question I feel stupid for asking. However I've dug around on the web for almost 30 mins and I can't get to the bottom of it. All I want is to display the day of the week based on users PC settings - not server time.
Example: "News item of the day for [insert day of week]" Sorry for my noobishness, I'm new to jQuery and what I have learned so far has been more in the realm of effects for designers, etc. Also Google is beeing annoying, every search for anything to do with "jQuery, day of week" only seems to return results on building a date picker. <sigh>
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Aug 22, 2010
I'm moving from fully Flash sites to AJAX withjQuery etc. I see that handling the situation where the user has javascript disabled is given a lot of emphasis in books and tutorials on jQuery. Is it really that important? After all, if you've disabled javascript shouldn't you accept a limited result? Accessibility seems a valid reason, but how many screen readers can't handle javascript? Mobile and other devices that can't handle it are only a concern if your site is one that's likely to be of interest to a small set of users so do you need to worry about them?
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Apr 12, 2011
functions like:
function showData(id) {
$.get("/url/getdata", {id : id}, function(data) {
$("#dialogData").html(data);
[code]....
no longer work with the addition of 1.5.Looking at firebug, the correct data is returned, but the function breaks after entering the callback.Everything simply stops.I read about the changes to Ajax call in 1.5, but I have over a thousand such calls through my project -> I cannot even begin to think about hunting them all down and changing them, let alone bug testing it all.
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Jul 19, 2010
I'm trying to use the jqmodal dialog plugin and everything is working OK except for one minor problem. It seems when I click on the link, the expected action does not occur until I click the second time. Essentially I set up a small test form with a single line put into a table. In that data line is an href, which when clicked calls an AJAX function and returns text, which displays as a dialog. Like I said, this works fine except for the fact that the dialog does not show until the second time I click on the link. I added an alert box to the code, so I know the function is executed the first time the link is clicked
<script>
$().ready(function() {
$("#hrefClick").click(function(e) {
e.preventDefault();
[Code]....
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Nov 22, 2011
I've a js with a loop wich generate ten ajax calls, but I aboslutely need that the first will be executed before the others. how to ?
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Mar 29, 2011
I noticed that all simple jQuery ajax calls are unable to cached by Firefox (no problem with other major browsers).
See the following test code:
$(document).ready(function(){
$("#load").click(function(){$("#test").load("/test.txt");});
[code]....
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Oct 14, 2010
So I have a three step process where the page loads and there is the first section of checkboxes... as the user makes their selections I want to display the next step which also has some checkboxes. If they select a checkbox from the next step then there's a 3rd step.
If I load all sections at once, all three groups of checkboxes works great as far as accepting selections and passing the proper information.
However if I load only one, then after selection is made, load the next one... the next one using the same code as showing all at once does NOT want to work. I can't select anything.
I'm starting with something like:
[Code].....
one is class=checklist, other is =media,... thinking the naming was conflicting and then I have them each call their own function to keep it separate.
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Mar 16, 2011
I see that the jQuery library accounts 164K which is almost 40% of the page weight. As can be seen in the source, /jquery.js loads twice, as do several other scripts! But if i remove /jquery.js library from either line, the page breaks (tabbed box does not come together).I am weak on understanding the ordering of dependencies.Are there any ideas that jump out at you about how script and css calls could be reordered so that the big library would need to be called only once?
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Oct 22, 2006
I have a Java GUI application where I perform a lot of long DB operations [e.g. massive SQL Insert's], which takes 5-60 secs to perform. Sometimes user double-clicks the button or just gets impatient and clicks again, which created duplicate records.
So I am trying to disable the button as soon as it is clicked, and as soon as it's done, re-enable it again.
I tried to do it in Javascript, just simple: <input... name=Save... onclick="enabled=true;">
and as soon as screen refreshes, it re-enables the button automatically.
That works in some cases, however when I need to do some other Javascript operation
(e.g. validate() the fields on the screen), disabling the button automatically stops both Javascript and association form action in Java which is totally unacceptable.
Is there any other simple solution to such problems in Java or Javascript?
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Aug 25, 2010
append.php:
<span>test</span>
jQuery function:
$(function(){
[Code]....
The content will be added on the first click, but not on the subsequent clicks however. The hidden field gets incremented fine though.
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Feb 27, 2010
I'm experiencing a weird problem when trying to do a $.ajax call. When I pass 5 variables, with either GET or POST, the script runs as I would like. However, when I use 6 or more variables, the script does not run. Does anyone know why this is?
Relevant code (stops1-5 are defined as JS variables earlier in my script, and the alerts are for testing)
$(".barcrawl-stop-id").each(function(){
alert("running ajax function");
$.ajax({
url: "/handlers/ajax/barcrawl_reorder.php",
[Code]....
So, the way it is now, it works fine (I get the first alert for each instance of .barcrawl-stop-id, and get an alert at the end with the returned data). However, when I add another variable to the data, like stop4: stop4, the script does not run (all I see is one alert with "running ajax function").
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Sep 22, 2010
I am trying to call a dynamically chosen function on success from an ajax call (later to be error and so on also)The following function works fine and passes the url to call and parameters into the makeAjaxPostCall function. successHandler is the function to call on ajax success.[code]
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Aug 10, 2009
I am a newbie to using jquery and have been exploring it developing a new app. At the moment I have a number of AJAX calls to the server which I have been queueing in an array and using a single $.ajax call to handle all of them. However I know about the browser limitations of two calls per page (at the same time and want to implement this to speed up page updating). To test concurrent ajax requests I have setup various asp pages to with delays 1sec, 5sec, 10sec etc etc. and a test html file with the follwing javascript
[Code]...
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Nov 3, 2010
I know about the same-origin policy and that one of the only ways to load data from a cross-domain is to load it as JSON. However, all I am trying to do is access data from a server on another port (which I believe the browser still treats as cross-domain). I need to do this because the server my application is on is a map server and the other server (Apache) is the only one that can handle php scripts. I have also tried out the plug-in from [URL] and while it works when I do $('#phpContent').load('http://www.google.com'); it doesn't work when I try $('#phpContent').load('http://localhost:80/mapScripts/getFiles.php'); I have also tried$.get('http://localhost:80/mapScripts/getFiles.php', function(data) { $('#phpContent').html(data); });
So here I am breaking my brain and do not know what else to attempt.
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