I have a web application that uses a lot of text input. In some cases it's form input and a Submit / POST action and in others the input text is processed using JavaScript / Ajax.
If I begin typing into, for example, a textarea and then switch to another window (e.g. Outlook) to copy some content to the clipboard, and then switch back to the browser to paste it, the textarea no longer accepts keyboard input.
This only appears to happen on my Windows 10 Pro laptop. On Mac OS it works fine.
I've used multiple browsers.
Is there something in the Windows setup that disables form input as a security measure?
Here is an example of a form declaration in the markup:
<form method="post" action="<?php echo __SITE_URL; ?>admin/_editcandidate.php" autocomplete="off">
I don't use any JavaScript events that are triggered when the focus changes.
Appreciate any insights.
I'm not sure this adds any value to anyone other than it's worth double checking your code for rogue event handlers.
I found this buried in an included file:
window.addEventListener('keyup', function(evt) { keyboardUp(evt); }, false);
and the associated function had a scenario where it could return false:
function keyboardUp(e)
{
var key;
if (window.event) // IE
{
key = e.keyCode;
}
else if(e.which)
{
key = e.which;
}
if (key === 18 && g.altkey === false) { g.altkey = true; return; }
if (g.altkey === false) return;
...
}
Pretty sloppy on my part.
Not sure why this should be an issue switching focus but it does at least solve my problem.
I have following jQuery code to prevent double clicking a button. It works fine. I am using Page_ClientValidate() to ensure that the double click is prevented only if the page is valid. [If there are validation errors the flag should not be set as there is no postback to server started]
Is there a better method to prevent the second click on the button before the page loads back?
Can we set the flag isOperationInProgress = yesIndicator only if the page is causing a postback to server? Is there a suitable event for it that will be called before the user can click on the button for the second time?
Note: I am looking for a solution that won't require any new API
Note: This question is not a duplicate. Here I am trying to avoid the use of Page_ClientValidate(). Also I am looking for an event where I can move the code so that I need not use Page_ClientValidate()
Note: No ajax involved in my scenario. The ASP.Net form will be submitted to server synchronously. The button click event in javascript is only for preventing double click. The form submission is synchronous using ASP.Net.
Present Code
$(document).ready(function () {
var noIndicator = 'No';
var yesIndicator = 'Yes';
var isOperationInProgress = 'No';
$('.applicationButton').click(function (e) {
// Prevent button from double click
var isPageValid = Page_ClientValidate();
if (isPageValid) {
if (isOperationInProgress == noIndicator) {
isOperationInProgress = yesIndicator;
} else {
e.preventDefault();
}
}
});
});
References:
Validator causes improper behavior for double click check
Whether to use Page_IsValid or Page_ClientValidate() (for Client Side Events)
Note by #Peter Ivan in the above references:
calling Page_ClientValidate() repeatedly may cause the page to be too obtrusive (multiple alerts etc.).
I found this solution that is simple and worked for me:
<form ...>
<input ...>
<button ... onclick="this.disabled=true;this.value='Submitting...'; this.form.submit();">
</form>
This solution was found in:
Original solution
JS provides an easy solution by using the event properties:
$('selector').click(function(event) {
if(!event.detail || event.detail == 1){//activate on first click only to avoid hiding again on multiple clicks
// code here. // It will execute only once on multiple clicks
}
});
disable the button on click, enable it after the operation completes
$(document).ready(function () {
$("#btn").on("click", function() {
$(this).attr("disabled", "disabled");
doWork(); //this method contains your logic
});
});
function doWork() {
alert("doing work");
//actually this function will do something and when processing is done the button is enabled by removing the 'disabled' attribute
//I use setTimeout so you can see the button can only be clicked once, and can't be clicked again while work is being done
setTimeout('$("#btn").removeAttr("disabled")', 1500);
}
working example
I modified the solution by #Kalyani and so far it's been working beautifully!
$('selector').click(function(event) {
if(!event.detail || event.detail == 1){ return true; }
else { return false; }
});
Disable pointer events in the first line of your callback, and then resume them on the last line.
element.on('click', function() {
element.css('pointer-events', 'none');
//do all of your stuff
element.css('pointer-events', 'auto');
};
After hours of searching i fixed it in this way:
old_timestamp = null;
$('#productivity_table').on('click', function(event) {
// code executed at first load
// not working if you press too many clicks, it waits 1 second
if(old_timestamp == null || old_timestamp + 1000 < event.timeStamp)
{
// write the code / slide / fade / whatever
old_timestamp = event.timeStamp;
}
});
you can use jQuery's [one][1] :
.one( events [, data ], handler ) Returns: jQuery
Description: Attach a handler to an event for the elements. The handler is executed at most once per element per event type.
see examples:
using jQuery: https://codepen.io/loicjaouen/pen/RwweLVx
// add an even listener that will run only once
$("#click_here_button").one("click", once_callback);
using count,
clickcount++;
if (clickcount == 1) {}
After coming back again clickcount set to zero.
May be this will help and give the desired functionality :
$('#disable').on('click', function(){
$('#disable').attr("disabled", true);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="disable">Disable Me!</button>
<p>Hello</p>
We can use on and off click for preventing Multiple clicks. i tried it to my application and it's working as expected.
$(document).ready(function () {
$("#disable").on('click', function () {
$(this).off('click');
// enter code here
});
})
This should work for you:
$(document).ready(function () {
$('.applicationButton').click(function (e) {
var btn = $(this),
isPageValid = Page_ClientValidate(); // cache state of page validation
if (!isPageValid) {
// page isn't valid, block form submission
e.preventDefault();
}
// disable the button only if the page is valid.
// when the postback returns, the button will be re-enabled by default
btn.prop('disabled', isPageValid);
return isPageValid;
});
});
Please note that you should also take steps server-side to prevent double-posts as not every visitor to your site will be polite enough to visit it with a browser (let alone a JavaScript-enabled browser).
The absolute best way I've found is to immediately disable the button when clicked:
$('#myButton').click(function() {
$('#myButton').prop('disabled', true);
});
And re-enable it when needed, for example:
validation failed
error while processing the form data by the server, then after an error response using jQuery
Another way to avoid a quick double-click is to use the native JavaScript function ondblclick, but in this case it doesn't work if the submit form works through jQuery.
One way you do this is set a counter and if number exceeds the certain number return false.
easy as this.
var mybutton_counter=0;
$("#mybutton").on('click', function(e){
if (mybutton_counter>0){return false;} //you can set the number to any
//your call
mybutton_counter++; //incremental
});
make sure, if statement is on top of your call.
If you are doing a full round-trip post-back, you can just make the button disappear. If there are validation errors, the button will be visible again upon reload of the page.
First set add a style to your button:
<h:commandButton id="SaveBtn" value="Save"
styleClass="hideOnClick"
actionListener="#{someBean.saveAction()}"/>
Then make it hide when clicked.
$(document).ready(function() {
$(".hideOnClick").click(function(e) {
$(e.toElement).hide();
});
});
Just copy paste this code in your script and edit #button1 with your button id and it will resolve your issue.
<script type="text/javascript">
$(document).ready(function(){
$("#button1").submit(function() {
$(this).submit(function() {
return false;
});
return true;
});
});
</script
Plain JavaScript:
Set an attribute to the element being interacted
Remove the attribute after a timeout
If the element has the attribute, do nothing
const throttleInput = document.querySelector('button');
throttleInput.onclick = function() {
if (!throttleInput.hasAttribute('data-prevent-double-click')) {
throttleInput.setAttribute('data-prevent-double-click', true);
throttleInput.setAttribute('disabled', true);
document.body.append("Foo!");
}
setTimeout(function() {
throttleInput.removeAttribute('disabled');
throttleInput.removeAttribute('data-prevent-double-click');
}, 3000);
}
<button>Click to add "Foo"!</button>
We also set the button to .disabled=true. I added the HTML Command input with type hidden to identify if the transaction has been added by the Computer Server to the Database.
Example HTML and PHP Commands:
<button onclick="myAddFunction(<?php echo $value['patient_id'];?>)" id="addButtonId">ADD</button>
<input type="hidden" id="hasPatientInListParam" value="<?php echo $hasPatientInListParamValue;?>">
Example Javascript Command:
function myAddFunction(patientId) {
document.getElementById("addButtonId").disabled=true;
var hasPatientInList = document.getElementById("hasPatientInListParam").value;
if (hasPatientInList) {
alert("Only one (1) patient in each List.");
return;
}
window.location.href = "webAddress/addTransaction/"+patientId; //reloads page
}
After reloading the page, the computer auto-sets the button to .disabled=false. At present, these actions prevent the multiple clicks problem in our case.
I hope these help you too.
Thank you.
One way I found that works is using bootstrap css to display a modal window with a spinner on it. This way nothing in the background can be clicked. Just need to make sure that you hide the modal window again after your long process completes.
so I found a simple solution, hope this helps.
all I had to do was create a counter = 0, and make the function that runs when clicked only runnable if the counter is = 0, when someone clicks the function the first line in the function sets counter = 1 and this will prevent the user from running the function multiple times when the function is done the last line of the code inside the function sets counter to 0 again
you could use a structure like this, it will execute just once:
document.getElementById('buttonID').addEventListener('click', () => {
...Do things...
},{once:true});
I am trying to autofocus on a text input when a user starts typing on a webpage.
i have tried this, but this is only for page load
<input type="text" name="text_input" autofocus>
How can i set it so it will focus when the user starts typing on the page
Use jQuery.
$('body').on('keydown', function() {
var input = $('input[name="text_input"]');
if(!input.is(':focus')) {
input.focus();
}
});
Edit
If you only want this to happen once, you can set some sort of flag, like this:
var flag = false;
$('body').on('keydown', function() {
var input = $('input[name="text_input"]'),
if(!input.is(':focus') && flag === false) {
input.focus();
flag = true;
}
});
Building on Josh Beam's answer, if you want to also tack whatever key the user pressed to the end of the input you could do something like the code below. It also only triggers if the pressed key is a number or letter, so it won't take focus if the user presses an arrow key, page up, etc.
$('body').on('keydown', function(keyPress) {
var input = $('input[name="text_input"]');
if(!input.is(':focus') && keyPress.key.match(/^[0-9a-zA-Z]+$/)) {
input.focus();
input.val(input.val()+keyPress.key);
}
});
I am using the required to show form fields that are required. I heard this is a bug in chrome but wanted to know if there was a work around. My code is posted below.
echo "<br><br><input class=button id=submitbutton type=submit value=\"".pcrtlang("Submit Service Request")."\" onclick=\"this.disabled=true;this.value='".pcrtlang("Sending Request")."...'; this.form.submit();\">";
I believe it will work if you remove the onlick function but then you have an issue if a user double clicks the submit button it will submit twice.
I use a javascript to disable the submit button to prevent double submissions, and then javascript to make the form submit.
The problem is that onclick is being called everytime (even when its not going to submit by the browser).
You can fix by changing the onclick to onsubmit (JSFiddle)
<input class="button" id="submitbutton" type="submit" value="Submit" onsubmit="this.disabled=true;this.value='Sending Request';">
I would be tempted to bind to the submit event of the containing form, and use the concept from _.debounce to limit the repetition of submissions:
jQuery:
// prevent the user from submitting the form twice within a second
var DELAY = 1000;
var lastSubmit = null;
$("#form").submit(function(e) {
if (lastSubmit === null || Date.now() - lastSubmit > DELAY)
return true;
// two ways to prevent the default action
e.preventDefault();
return false;
});
Or staight JavaScript:
// prevent the user from submitting the form twice within a second
var DELAY = 1000;
var lastSubmit = null;
document.getElementById('form').addEventListener('submit', function(e) {
if (lastSubmit === null || Date.now() - lastSubmit > DELAY)
return true;
// two ways to prevent the default action
e.preventDefault();
return false;
});
You can tune DELAY to meet your requirements, or handle the form submission failing to reset a disabled state.
If a requirement is to use attributes for the hooks, then:
echo "<form onsubmit=\"var stop = lastSubmit && Date.now() - lastSubmit <= 1000;stop && e.preventDefault();return !stop;\">";
I just have a question about how to use ajax or jquery to control stop(esc) in browser url section. This is because some data is very large so it will take very long time to wait. If user does not want to wait he can click stop(esc) in url(it was "refresh" before). The user click stop button "X" then html page will do some event. Could you tell me how to manipulate? Does it has API that I can use directly? Thank you very much!
var code = (e.keyCode ? e.keyCode : e.which);
if(code == 13) { //Enter keycode
//Do something
}