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Handle keyboard event in javascript #93

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203 changes: 203 additions & 0 deletions Handle Keyboard event in javascript
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Keyboard Events tester</title>
<style>
.evtType,
.evtHandle {
padding: 8px 12px;
font-size: 16px;
outline: none;
border: 1px solid #d6d6d6;
cursor: pointer;
margin: 4px;
}

.evtType.active,
.evtHandle.active {
background: #7fffd4;
border: 1px solid #49cca0;
}

textarea {
width: calc(100% - 44px);
height: 80px;
padding: 10px;
margin: 12px;
font-size: 18px;
}

.caselist {
font-family: roboto;
font-size: 15px;
border: 1px solid #d0d0d0;
}

.caselist div {
padding: 8px 6px;
border-bottom: 1px solid #d0d0d0;
}

.textBox {
display: none;
}

.textBox.active {
display: block;
}
</style>
</head>

<body>



<div style="padding:6px 2px; margin:6px 2px;">
<p>Select Keyboard Event Type:</p>
<button class="evtType active" onclick="changeEventType(this,'onkeydown')">onkeydown</button>
<button class="evtType" onclick="changeEventType(this,'onkeypress')">onkeypress</button>
<button class="evtType" onclick="changeEventType(this,'onkeyup')">onkeyup</button>
</div>
<div style="border-top:1px solid #ddd; padding:6px 2px; margin:6px 2px;">
<p>Select Event Handle Type:</p>
<button class="evtHandle active" data-input-box="txtBox"
onclick="changeEventHandleType(this,'html')">HTML</button>
<button class="evtHandle" data-input-box="txtBox1" onclick="changeEventHandleType(this,'js')">JS</button>
<button class="evtHandle" data-input-box="txtBox2"
onclick="changeEventHandleType(this,'addEventListener')">addEventListener</button>
</div>

<br><br>
<textarea id="txtBox" class="textBox active" placeholder="Type somethin here..." onkeydown="keydownAction(event)"
onkeypress="keypressAction(event)" onkeyup="keyupAction(event)"></textarea>

<textarea id="txtBox1" class="textBox" placeholder="Type somethin here...">1</textarea>
<textarea id="txtBox2" class="textBox" placeholder="Type somethin here...">2</textarea>

<br>
<p style="font-size:18px; font-family:roboto;">You have pressed the key : <span id="triggerKey"
style="font-weight:600;">-</span></p>


<div class="caselist">
<div>Case 1 : key down event handle with html </div>
<div>Case 2 : key press event handle with html</div>
<div>Case 3 : key up event handle with html</div>
<div>Case 4 : key down event handle with JS</div>
<div>Case 5 : key press event handle with JS</div>
<div>Case 6 : key up event handle with JS</div>
<div>Case 7 : key down event handle with addEventListener</div>
<div>Case 8 : key press event handle with addEventListener</div>
<div>Case 9 : key up event handle with addEventListener</div>
<div>

<pre>Chrome/opera/firefox(desktop): 1, 2, 3
Chrome/Opera/firefox(android): 1, 3 ( undefine 229)
Chrome/Opera/firefox(android): 2 ( )
</pre>


<script>
var eventType = "onkeydown";
var eventHandle = "html";

var txtBox = document.getElementById('txtBox');
var txtBox1 = document.getElementById('txtBox1');
var txtBox2 = document.getElementById('txtBox2');

function changeEventType(elm, type) {
document.querySelector('button.evtType.active').classList.remove('active');
elm.classList.add('active');
eventType = type;
document.getElementById('triggerKey').innerText = "";
}

function changeEventHandleType(elm, type) {
document.querySelector('button.evtHandle.active').classList.remove('active');
elm.classList.add('active');
eventHandle = type;
document.querySelector('textarea.textBox.active').classList.remove('active');
document.getElementById(elm.dataset.inputBox).classList.add('active');
}

// how to handel events
// 1. using HTML

function keydownAction(e) {
if (eventType == "onkeydown" && eventHandle == "html") {
handleKeyEvent(e, 1);
}
}

function keypressAction(e) {
if (eventType == "onkeypress" && eventHandle == "html") {
handleKeyEvent(e, 2);
}
}

function keyupAction(e) {
if (eventType == "onkeyup" && eventHandle == "html") {
handleKeyEvent(e, 3);
}
}




// 2. using Javascript
txtBox1.onkeydown = function (e) {
if (eventType == "onkeydown" && eventHandle == "js") {
handleKeyEvent(e, 4);
}
};

txtBox1.onkeypress = function (e) {
if (eventType == "onkeypress" && eventHandle == "js") {
handleKeyEvent(e, 5);
}
};

txtBox1.onkeyup = function (e) {
if (eventType == "onkeyup" && eventHandle == "js") {
handleKeyEvent(e, 6);
}
};



// 3. using addEventListener
// txtBox.addEventListener("onkeyup", functionName);
// or
txtBox2.addEventListener("onkeydown", function (e) {
if (eventType == "onkeydown" && eventHandle == "addEventListener") {
handleKeyEvent(e, 7);
}
});

txtBox2.addEventListener("onkeypress", function (e) {
if (eventType == "onkeypress" && eventHandle == "addEventListener") {
handleKeyEvent(e, 8);
}
});

txtBox2.addEventListener("onkeyup", function (e) {
if (eventType == "onkeyup" && eventHandle == "addEventListener") {
handleKeyEvent(e, 9);
}
});


function handleKeyEvent(event, caseType) {
var keyCode = event.which || event.keyCode;
var key = event.key;
document.getElementById('triggerKey').innerText = key + " (" + keyCode + ")" + " [ case: " + caseType + " ]";
}

</script>
</body>

</html>