jQuery supports 3 types of keyboard events and which we are :
- keyup(): Event fired when a key is released on the keyboard.
- keydown(): Event fired when a key is pressed on the keyboard.
- keypress:() Event fired when a key is pressed on the keyboard.
From above definitions, it looks like that keydown() and keypress() are same thing. But, actually they are not exactly same.
Let’s see how they are different.
1) Special keys (e.g. CTRL or ALT or SHIFT)
In case if you press any special key, browser will fire only keydown() event but not keypress() event.
Try Yourself
Try pressing some normal keys and then some special keys.
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
var keydownCounter = 0;
var keypressCounter = 0;
$( document ).ready(function(){
$('#textbox').keydown(function(event){
$('#keydownCounter').html(++keydownCounter);
});
$('#textbox').keypress(function(event){
$('#keypressCounter').html(++keypressCounter);
});
});
</script>
</head>
<body>
<h4>jQuery keydown() and keypress() difference</h4>
<label>TextBox : </label><input id="textbox" type="text" size="50" />
<div>
<label>keydown() event fired : </label><span id="keydownCounter">0</span> times.
</div>
<div>
<label>keypress() event fired : </label><span id="keypressCounter">0</span> times.
</div>
</body>
</html>
2) Capturing keycode or key ascii value
If you hit the letter a, and A (capital letter), you will find the below behavior of events.
- keydown() will display a = 65, A = 65 (case insensitive).
- keypresss() will display a= 97, A=65 (case sensitive).
If you want to capture the real character key in, always use keypress() event.
Try Yourself
Try pressing some keys with [Caps Lock] ON and then after turning it OFF.
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
$( document ).ready(function(){
$('#textbox').keydown(function(event){
var keycode = (event.keyCode ? event.keyCode : event.which);
$('#keydownCode').html(keycode);
});
$('#textbox').keypress(function(event){
var keycode = (event.keyCode ? event.keyCode : event.which);
$('#keypressCode').html(keycode);
});
});
</script>
</head>
<body>
<h4>jQuery keydown() and keypress() difference</h4>
<label>TextBox : </label><input id="textbox" type="text" size="50" />
<div>
<label>keydown() detected keycode : </label><span id="keydownCode">0</span>.
</div>
<div>
<label>keypress() detected keycode : </label><span id="keypressCode">0</span>.
</div>
</body>
</html>
var keycode = (event.keyCode ? event.keyCode : event.which);
3) When any key is long pressed
In this case, according to docs, keydown() event is triggered once, but the keypress() event will keep triggering until the key is released. Anyway, this is browser specific behavior and I will not suggest you on this feature. This should be limited to your knowledge only.
Try Yourself
Press any key and keep it down.
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">
var keydownCounter = 0;
var keypressCounter = 0;
$( document ).ready(function(){
$('#textbox').keydown(function(event){
$('#keydownCounter').html(++keydownCounter);
});
$('#textbox').keypress(function(event){
$('#keypressCounter').html(++keypressCounter);
});
});
</script>
</head>
<body>
<h4>jQuery keydown() and keypress() difference</h4>
<label>TextBox : </label><input id="textbox" type="text" size="50" />
<div>
<label>keydown() event fired : </label><span id="keydownCounter">0</span> times.
</div>
<div>
<label>keypress() event fired : </label><span id="keypressCounter">0</span> times.
</div>
</body>
</html>
Let me know if you have any doubt or suggestion.
great job
I’m using Firefox 29.0.1 and when holding down the Enter key, keypress and keydown both continually fire with identical counts.
However, when pressing on keys other than the Enter key, keydown continually fires and keypress is counted once only.
Strange. I will also check it.
On #3, it’s the opposite for me, I’m on Mac OS and the “keydown” even keeps going, not the “keypress”. Also you have 1 or 2 grammar errors, not a big deal.
thanks for your comment.
How To Do the Radio Button Validation in SAPUI5 ?
Here I created A sample Form…Tell me the Validations of radio Button?
Insert title here
var oLayout1 = new sap.ui.layout.form.ResponsiveGridLayout(“L1”);
var oForm1 = new sap.ui.layout.form.Form(“F1”,{
title: new sap.ui.core.Title({text: “Ticket Information”}),
layout: oLayout1,
formContainers: [
new sap.ui.layout.form.FormContainer(“F1C1”,{
// title: “Person data”,
formElements: [
new sap.ui.layout.form.FormElement({
label: “TicketNumber”,
fields: [new sap.ui.commons.TextField({value: “200008216”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Subject”,
fields: [new sap.ui.commons.TextField({value: “(10796)Orders Being Rejected With System Error”})
]
}),
new sap.ui.layout.form.FormElement({
label: “Sybase 365 Campaign “,
fields: [new sap.ui.commons.TextField({value: “Unisys AUS Push Account”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Sybase 365 Campaign Status”,
fields: [new sap.ui.commons.TextField({value: “Active”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Contact Name “,
fields: [new sap.ui.commons.TextField({value: “Mr. Robert Simmons”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Account Name”,
fields: [new sap.ui.commons.TextField({value: “Unisys Australia Pty Limited”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Account Service Status”,
fields: [new sap.ui.commons.TextField({value: “Unknown”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “Account Customer Status”,
fields: [new sap.ui.commons.TextField({value: “Live”}),
]
}),
new sap.ui.layout.form.FormElement({
label: “CustomerSatisfaction”,
fields: [new sap.ui.commons.RadioButtonGroup({
columns: 2,
id :”msg”,
name:”cust_option”,
items: [new sap.ui.core.Item({text: “Yes”}),
new sap.ui.core.Item({text: “No”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Portal Information”,
// fields: [new sap.ui.commons.TextField({value: “Live”}),
})
]
}),
new sap.ui.layout.form.FormContainer(“F1C2”,{
//title: “address”,
formElements: [
new sap.ui.layout.form.FormElement({
label: “Status”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “Closed”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Severity”,
fields: [new sap.ui.commons.DropdownBox({
items:[new sap.ui.core.ListItem({text: “2”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Priority”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “TBD”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Reason for Closed”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “Fixed”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Ticket Category”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “AM Network”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Ticket Subcatagory”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text:”Missing MT”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Product Catagory”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “SMS”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Product SubCatagory”,
fields: [new sap.ui.commons.DropdownBox({
items: [new sap.ui.core.ListItem({text: “AM SMS”})],
})]
}),
new sap.ui.layout.form.FormElement({
label: “Salesforce Ticket Number”,
fields: [new sap.ui.commons.TextField({value: “00158253”}),
]
})
]
}),
new sap.ui.layout.form.FormContainer(“C11”,{
formElements: [
new sap.ui.layout.form.FormElement({
label: “”
}),
new sap.ui.layout.form.FormElement({
fields: [new sap.ui.commons.Button({text: “Edit”,
width:”100%”,
//press : function() {alert(‘Alert from ‘ + oButton1.getText());}
layoutData: new sap.ui.layout.form.GridElementData({hCells: “1”})
// press : function() {alert(‘Alert from ‘ + oButton1.getText());}
})]
})
]
})
]
});
oForm1.placeAt(“sample1”);
this is my form..
Absolutely no idea of SAP UI.
Good information.