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Why wont this event listener work for multiple keys when in an array in javascript?


Why wont this event listener work for multiple keys when in an array in javascript?

By : Ramakrishna Kumar
Date : November 18 2020, 03:49 PM
fixed the issue. Will look into that further When you press multiple keys, your addEventListener no longer listens to your first keypress. That's why your if statement is failing. You can test that out on the first example on http://api.jquery.com/event.which/ Try holding one key, then holding a second key, and then releasing the second key. You'll notice that the first key won't be logged anymore.
*edit: A way around that would be to implement it like this:
code :
var keys = {};

$(document).keydown(function (e) {
    keys[e.which] = true;
});

$(document).keyup(function (e) {
    delete keys[e.which];
});


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Adding multiple expanders event programmatically wont work

Adding multiple expanders event programmatically wont work


By : Reechard Flanagan
Date : March 29 2020, 07:55 AM
around this issue I suspect you are finding x in the delegate is always the highest value it reached during the loop. This is due to the way the compiler instantiates the instance of the anonymous method you've defined. It looks at what captured outer variables there are around the delegate and decides whether it requires separate instances or if it can use a single instance. In this case, you have no captured outer variables; therefore, the compiler is permitted to use the same instance of the delegate and therefore the same value of x.
To get around this issue, all you need to do is add a more granular variable just before the delegate and assign it the value of x. This will work:
code :
private void InitExpanders()
{
    var expanders = GetExpanders();
    int x = 0;
    for (int i = 0; i < expanders.Count; i++)
    {
        if (i % 6 == 1)
        {
                int y = x++;
                expanders[i - 1].Expanded += delegate
                {
                    DisableBigExpanders(y);
                };
        }
    }
}
Why Won't This Simple Event Listener Work in Javascript?

Why Won't This Simple Event Listener Work in Javascript?


By : Thangapandi Pandi
Date : March 29 2020, 07:55 AM
seems to work fine I was wondering if someone could provide a teaching point for me. I am trying to learn Javascript and the logic of this code seems reasonable to me, but it doesn't work for some reason. , The switch must be inside the function of the event Listener:
code :
myButton.addEventListener("click", function() {
    testingVar = "hello";
    switch (testingVar) {
      case "hello" :
        alert("You've got the hello condition!");
        break;

      case "goodbye" :
        alert("You've got the goodbye condition");
        break;
    } // end switch statement
}, false);
JavaScript HTML DOM Event Listener doesn't work

JavaScript HTML DOM Event Listener doesn't work


By : Randy
Date : March 29 2020, 07:55 AM
like below fixes the issue My code: , Code should look like this
code :
<form id="<?php echo $id; ?>" name ="form_test" action="test_form.php" method="post">
    <input type="radio" name="type_test" value="ola"> ola <br/>
    <input type="radio" name="type_test" value="adeus"> adeus <br/>
    <input type="submit" value="submit" /> <!--imput only use for POST method-->
</form>

<button id="myBtn">Try it</button>

<script>
        document.getElementById("myBtn").addEventListener("click", functio_test);

        function functio_test(){
            var x = document.querySelector('input[name="type_test"]:checked').value;
            if(x == "ola"){
                 alert("Ola José");
            }
            else if(x == "adeus"){
                 alert("Adeus José");
            }
            else {
                alert("Continua José");
            }
        }
</script>
Trouble getting event listener to work properly in javascript

Trouble getting event listener to work properly in javascript


By : Aditya Tyagi
Date : March 29 2020, 07:55 AM
hop of those help? document.getElementById is case-sensitive.
You have id="showAll" when you are searching for document.getElementById("showALL");.
code :
var greenBox = document.getElementById("greenBox");
var redBox = document.getElementById("redBox");
var blueBox = document.getElementById("blueBox");
var showALL = document.getElementById("showAll");
var hideALL = document.getElementById("hideAll");


var boxes = [greenBox, redBox, blueBox];

function showBoxes(boxes) {
  for (i = 0; i < boxes.length; i++) {
    boxes[i].style.display = "block";
  }
}

function hideBoxes(boxes) {
  for (i = 0; i < boxes.length; i++) {
    boxes[i].style.display = "none";
  }
}

showALL.addEventListener("click", function() {
  showBoxes(boxes);
})


// The "Hide All" button invokes the hideBoxes method
hideALL.addEventListener("click", function() {
  hideBoxes(boxes);
})
.box {width: 200px; height: 36px;}

#redBox {background-color: #F00;}
#greenBox {background-color: #0F0;}
#blueBox {background-color: #00F;}
<form action="#">
  <input type="button" id="showAll" value="Show All"><br />
  <input type="button" id="hideAll" value="Hide All"><br />
</form>

<div class="box" id="greenBox" style="display:none"></div>
<div class="box" id="redBox" style="display:none"></div>
<div class="box" id="blueBox" style="display:none"></div>
Javascript - Add Event Listener to live <a> tags but exclude the inside elements from the Event Listener

Javascript - Add Event Listener to live <a> tags but exclude the inside elements from the Event Listener


By : Bin Li
Date : March 29 2020, 07:55 AM
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