I want to control whether a link is clickable or an error should be displayed (Based on result of an ajax call).
<a class="lnkCustomer" href="http://localhost/viewcustomer" target="_blank" data-customerno="237">View</a>
I get to the point where I am able to set the link as "allowed to be clicked":
// Authorized
anchor.data("authorized", true);
However when I run this code, the link still does not open. Ideally once the ajax call is complete, it should invoke the click event. I believe the issue is in this line.
// Trigger Anchor
anchor.click();
This is the entire code:
<script type="text/javascript">
$(".lnkCustomer").click(function(e)
{
var customerNo = $(this).data('customerno');
var anchor = $(this);
// Check for authorized
if (anchor.data("authorized"))
{
return true;
}
$.ajax(
{
url: 'http://localhost/checkcustomer',
type: 'POST',
dataType: 'json',
data: { customerNo: customerNo },
cache: false,
success: function (result)
{
if (result.success)
{
// Authorize
anchor.data("authorized", true);
// Trigger Anchor
anchor.click();
}
else
{
// Show a message in a alert or div
alert('Not authorized');
}
}
});
// Default to false (Do not process anchor)
return false;
});
</script>
Notes: I am using class instead of id in the anchor because I have various links that will trigger this event. However as you can see, this should not be an issue since I am always referring to the individual object:
var anchor = $(this);
You cannot open a new tab without popups enabled or the user's click for that event.
You cannot delay it with promises or invoke a trusted click event.
If you want to verify a user can click your link, then do the API request on page load and store the result.
Or make your link into a button with a two click process for checking and then opening.
There is a simple answer : you can't trigger a click if it doesn't come from a trusted event (change, click, dblclick, mouseup, reset, submit).
Here you are trying to trigger a click after an AJAX (asynchronous) request, which is not allowed.
More info here.
As suggested you could replace it by window.open(href, '_blank'); but beware it could also be blocked by the browser parameters.
Unfortunately, as others mentioned, href cannot be delayed. I did find a work-around to suit the particular scenario. I created an intermediary page when user clicks on the href. This page then performs the ajax request (server side), if it is validated it goes on and display the resource. Otherwise it displays an error and stays on the intermediary page.
Anytime you want to override a browsers default action, you need to call .preventDefault() at the top of the event listener.
After that, since you're server side validating the link every time it's clicked, there's really no reason to store it's state client side. Instead of trying to re-click the link, you could just call window.open(), which is what achors do by default.
$('.lnkCustomer').on('click', function(e) {
e.preventDefault(); //makes anchor click do nothing
let href = this.href;
//pretend this is the call back from your ajax call
//$.ajax(
// success: function(result) {
if (result.success) {
window.open(href, '_blank'); //what an anchor click does when not prevented
} else {
alert('Not authorized');
}
});
Try triggering click like this: anchor[0].click(); and see if that works.
For readability, you can save a reference to DOM element of anchor, not just the jQuery object:
var anchor = $(this);
var anchorEl = $(this)[0];
and trigger click using the DOM element:
anchorEl.click();
I think we cannot overwrite the default behavior of the anchor tag but we can work around it. In this solution, I have replaced href with data-link. And mimic the anchor mechanism with window.open.
Code :
<a class="lnkCustomer" data-link="http://localhost/viewcustomer1" data-customerno="111" data-auth>View</a>
<a class="lnkCustomer" data-link="http://localhost/viewcustomer2" data-customerno="237" data-auth>View</a>
<a class="lnkCustomer" data-link="http://localhost/viewcustomer3" data-customerno="237" data-auth>View</a>
<script type="text/javascript">
$(".lnkCustomer").click(function (e) {
var customerNo = $(this).data('customerno');
var linkToGo = $(this).data('link');
var anchor = $(this);
// Check for authorized
if (anchor.data("authorized")) {
var win = window.open(linkToGo, '_blank');
}else{
$.ajax(
{
url: './checkcustomer.php',
type: 'POST',
data: { customerNo: customerNo },
cache: false,
success: function (result) {
if (result == 'authorized') {
anchor.data("authorized", true);
//new code
anchor.attr("href", linkToGo);
anchor.click();
// Dont us this due to popup blocker
//var win = window.open(linkToGo, '_blank');
}
else {
// Show a message in a alert or div
alert('Not authorized');
}
}
});
}
});
</script>
Please note :
New note for security: As you can see we are using quite a visible data-link and anyone with enough effort can visit the link whether it is authorized or not. If the above answer gets you through the popup blocker, the next few things you can do is maybe only fetch accessible links from the start
OR add a "show links" button and then fetch only accessible links to the user. You can do it via ajax. and also you will not need this JS/Jquery code.
OR assign a random number to data-link and then fetch in your PHP code see if it is authorized if it is then only return accessible HTTP link. many ways to improve.
You can use CSS to style the anchor tags, which I have not in the solution
One method I tried was with use of preventDeault, but it do not work
AFAICT you are 90% of the way there, you're just missing a few key details.
Working JSFiddle.
e.preventDefault(): As already mentioned in other answers/comments, you need to prevent the default action which the event triggers, otherwise the browser will just begin the process of navigating to the link while your JS is still running.
anchor.click() will trigger a click on your link, which will ... start the whole process again! You'll get stuck in a recursive loop. The click is done, you now want to navigate. To open a new window in Javascript, use window.open(href, '_blank');
If your link is already authorised, you need to do the same as if the AJAX authorises it the first time around. Instead of return true;, you need to do the same window.open() again.
Also a suggestion - the convention for using GET or POST is:
use POST when changing data, eg creating a user, or making a purchase, logging in - something which should not happen 2x if you hit reload;
use GET when viewing data, no state changes, no harm in reloading;
AFAICT you are simply querying some customer details, so this should be a GET request.
I've modified you code to work with JSONPlaceholder - a dummy REST API which provides JSON data for this kind of situation (where we need to test an AJAX call with a working response), so we can simulate your AJAX call. It only accepts GET requests, so I've changed your POST to GET, and I've updated the test of the response based on the dummy data it sends back. You can see the output we're working with for User ID 1, and User ID 2.
Since you need to do the "go to the link" chunk of code in more than one place, I extracted that to a function you can call, so we don't need to duplicate that code in several places.
I also added a few extra alerts so you can be sure of what is happening.
See it all in action on JSFiddle.
Javascript:
// A function to actually open the new page, since we need to do this in
// more than one place.
function goToLink(anchor) {
let href=anchor.attr('href');
window.open(href, '_blank');
}
$(".lnkCustomer").click(function(e) {
// Prevent the default action this event would normally trigger from
// happening - in this case, navigating to the target href.
e.preventDefault();
var customerNo = $(this).data('customerno');
var anchor = $(this);
// Check for authorized, and open the link if so
if (anchor.data("authorized")) {
alert("Already authorized, let's go!");
goToLink(anchor);
}
// https://jsonplaceholder.typicode.com/ is a dummy REST JSON generator.
// Let's use it to simulate your AJAX call. User ID 1's username is Bret,
// user ID 2's username is Antonette. Let's use customerNo in the URL to
// retrieve user ID 1 or 2, and simply allow the click if the username is
// Antonette.
// First build the URL:
let url = 'https://jsonplaceholder.typicode.com/users/' + customerNo
$.ajax({
url: url,
type: 'GET',
dataType: 'json',
data: {
customerNo: customerNo
},
cache: false,
success: function(result) {
if (result.username === 'Antonette') {
// Authorize and go
alert("Authorization success, let's go!");
anchor.data("authorized", true);
goToLink(anchor);
} else {
// Show a message in a alert or div
alert('Not authorized');
}
}
});
// Default to false (Do not process anchor)
return false;
});
HTML:
<ul>
<li><a class="lnkCustomer" href="https://google.com/" target="_blank" data-customerno="1">Google (no go)</a></li>
<li><a class="lnkCustomer" href="https://stackoverflow.com/" target="_blank" data-customerno="2">Stackoverflow (allowed)</a></li>
</ul>
I am working on building a website that will not reload to a new page every time a link is pressed. I want to make something kind of like all enterprise/popular websites. (When looking in the network dev tab: notice that youtube page doesn't completely reload when you click on a link, same with google, same with Facebook for the most part. They all usually just reload the page content and nothing else.)
I would like only the HTML between the body tags to be changed (nothing else: no js,css, no head tags, etc).
It would seem like it is pretty easy. Currently, I am just using ajax to go out and fetch the html of the page, and load that into the body. Done! Not so fast... Three things (my code is at the bottom)
The js includes are located at the bottom of the page, right before the closing body and html tags. When looking in the network tab, it shows that the same js is always gotten again and parsed again. How do I prevent that?
Some pages will not load styles that are set. (note that all css, js, etc. scripts are the same for every page)
I want to make sure that the page is completely reloaded if the user leaves the website.
I am not sure if I am looking for a fix to the way I am doing it, but probably just a completely better different way to do it.
Here is my code:
$('a').on('click', function () { //on click of any <a> tag
var where = $(this).attr('href'); //gets url of the <a> attribute
$.ajax({
type: "GET",
url: where, //where is the variable defined above
success: function(a) {
// load next page
history.pushState({urlPath: where},"",where); //changes the link of the webpage
$('body').html(a); //changes the body of the webpage
document.title = $('#title').text(); //changes the title using some weird irrelevant method
}
});
return false;
});
$(window).on('popstate', function() {//on click of the back or forward button
$.ajax({
type: "GET",
url: window.location.href, //the url is the url that the back or forward button is set to
success: function(data) {
//console.log();
$('body').html(data);//replaces data
document.title = $('#title').text();//changes title using weird irrelevant method
}
});
});
I was learning some about this html5 concept and i was trying to integrated in my project .
I have a page called chat_wnd.aspx wish is a chat page between two client programmed by Signalr, and a masterpage having a div like so :
<script type="text/javascript">
function OpenChatwnd() {
$("#ifrm").attr("src", "/chat_wnd.aspx");
}
</script>
Open chat wnd
<div id="dv_chat">
<iframe id="ifrm"></iframe>
</div>
Is there any way to use the push/pop state to prevent the iframe from reloading inside the div every time i navigate to another page in my website
PushState only changes URL and adds the URL into history without change content, so you should use ajax to change your content.
Note that if you want to use <a> to navigate another page, your javascript may like below:
$('a').click(function(e) {
e.preventDefault(); // prevent default action of navigating to another page
// ajax load data
$.ajax({
url: $(this).attr('href'),
type: "GET",
success: function(html){
$('#content').(html);
},
error:function(xhr, ajaxOptions, thrownError){
console.error(xhr.status);
console.error(thrownError);
}
});
// change the current URL
window.history.pushState('', document.title, $(this).attr('href'));
});
Also, here is a jQuery plugin PJAX provides the integration of AJAX and pushState, you can see there demo at here.
I am trying to create a webpage that will dynamically fill a div using AJAX. I have been able to simply update the div content with the following AJAX code:
$(document).ready(function(){
$("#projects-list a").click(function(e){
e.preventDefault();
var url = $(this).attr('href'); //get the link you want to load data from
$.ajax({
type: 'GET',
url: url,
success: function(data) {
$('#content').fadeOut(300, function() {
$('#content').html(data).delay(200).fadeIn(300);
});
}
});
});
});
However, I also am hoping to find a way to update the page URL or change the hash. So for instance, when a user is given the link to /projects.html they will be sent to a page of links, and then when a link is clicked the content is changed using AJAX and the url will change to /projects.html#first. This way then a user navigates to /projects.html#first they will see the content for the first project rather than the original list of projects to choose from.
I would recomend to use a library to handle URL and paths
http://github.com/flatiron/director
http://balupton.github.com/history.js/demo
if you want to use standard # then you can use via js, on a function call do :
window.location.hash = valueYouWantToSet, some ID mostly,
and then you can check on page load if there is a # in there then call a particular function like :
handleHash: function () { if (!isNaN(parseInt(window.location.hash.replace('#', '')))){ this.showDetails(window.location.hash.replace('#', '')); }
People create their own websites using WYSIWYG creator i give them. These websites have links inside of them. Also they can explore the HTML of the website and put there their own links.
I would like now to handle every link click occurring in website created with my creator and log it to my server. I know how to pass the data from JS or jQuery to PHP server. But what i need to know is how to handle the moment when person clicks a link, postpone the redirection for some moment, and in this time get the url and title of this link and send to my PHP server.
So how to handle every link click (or location change) on website that structure i don't know and get the link and title of the link clicked?
$('a').click(function(e) {
e.preventDefault();
var href = $(this).attr('href');
var title = $(this).attr('title');
// Send your data to php
if ($(this).attr('target') === '_blank') {
window.location.href = href; // redirect to href
} else {
window.open(href);
}
});
jQuery("a").click(function(){
var href = $(this).attr('href');
$.post('/', {link: href}).then(function(){ document.location = href; });
return false;
});
just a try
To intercept every link, just place this function somewhere that every page has access to (header/footer/etc.):
$('a').click(function(event) {
event.preventDefault();//To prevent following the link
//Your logic. attr('href') and attr('title')
});
You can use jQuery to do this. Use the on event and bind to the click event of a element. You can then do an event.preventDefault(); do your logic and then continue as normal by getting the href from the target.
Why you want to wait till logging is completed for the redirection. Let it be an asynchronous call so that user don't need to wait. If you want to have your server page in a different domain, to tackle the cross domain ajax issue, use jsonp datatype.
$('a').click(function() {
$.ajax({
url:"yourwebsite/loggingpage.php?data="+$(this).attr("href"),
dataType: 'jsonp' // Notice! JSONP <-- P (lowercase)
});
});
and in loggingpage.php, you can read the request data and log it to your persistent storage or wherever you want.