Simple way to check if placeholder is supported?
JavascriptHtmlPlaceholderJavascript Problem Overview
I want to use the HTML5
"placeholder"
attribute in my code if the user's browser supports it otherwise just print the field name on top of the form. But I only want to check whether placeholder is supported and not what version/name of browser the user is using.
So Ideally i would want to do something like
<body>
<script>
if (placeholderIsNotSupported) {
<b>Username</b>;
}
</script>
<input type = "text" placeholder ="Username">
</body>
Except Im not sure of the javascript bit. Help is appreciated!
Javascript Solutions
Solution 1 - Javascript
function placeholderIsSupported() {
var test = document.createElement('input');
return ('placeholder' in test);
}
I used a jQuery-ized version as a starting point. (Just giving credit where it's due.)
Solution 2 - Javascript
Or just:
if (document.createElement("input").placeholder == undefined) {
// Placeholder is not supported
}
Solution 3 - Javascript
Another way without making an input element in memory that has to be GC'd:
if ('placeholder' in HTMLInputElement.prototype) {
...
}
Solution 4 - Javascript
If you are using Modernizr, quick catch following:
if(!Modernizr.input.placeholder){
...
}
Solution 5 - Javascript
http://html5tutorial.info/html5-placeholder.php has the code to do it.
If you're already using jQuery, you don't really need to do this though. There are placeholder plugins available ( http://plugins.jquery.com/plugin-tags/placeholder ) that will use the HTML5 attribute where possible, and Javascript to simulate it if not.
Solution 6 - Javascript
I'm trying to do the same... here i wrote this
if(!('placeholder'in document.createElement("input"))){
//... document.getElementById("element"). <-- rest of the code
}}
With this you should have an id to identify the element with the placeholder... I don't know thought if this also help you to identify the element ONLY when the placeholder isn't supported.
Solution 7 - Javascript
Hi there this is an old question but hopefully this helps someone.
This script will check the compatibility of placeholders in your browser, and if its not compatible it will make all input fields with a placeholder use the value="" field instead. Note when the form is submitted it will also change your input back to "" if nothing was entered.
// Add support for placeholders in all browsers
var testInput = document.createElement('input');
testPlaceholderCompatibility = ('placeholder' in testInput);
if (testPlaceholderCompatibility === false)
{
$('[placeholder]').load(function(){
var input = $(this);
if (input.val() == '')
{
input.addClass('placeholder');
input.val(input.attr('placeholder'));
}
});
$('[placeholder]').focus(function() {
var input = $(this);
if (input.val() == input.attr('placeholder')) {
input.val('');
input.removeClass('placeholder');
}
}).blur(function() {
var input = $(this);
if (input.val() == '' || input.val() == input.attr('placeholder')) {
input.addClass('placeholder');
input.val(input.attr('placeholder'));
}
}).blur().parents('form').submit(function() {
$(this).find('[placeholder]').each(function() {
var input = $(this);
if (input.val() == input.attr('placeholder')) {
input.val('');
}
})
});
}
Solution 8 - Javascript
A bit late to the party, but if you're using jQuery or AngularJS you can simplify the method suggested above without using any plugins.
jQuery
typeof $('<input>')[0].placeholder == 'string'
AngularJS
typeof angular.element('<input>')[0].placeholder == 'string'
The checks are very similar, as AngularJS runs jQlite under the hood.
Solution 9 - Javascript
NOTE: Placeholder DO NOT work in internet explorer in a way, it should work.
document.createElement("input").placeholder == undefined
Doesnt work in internet explorer 11 - document.createElement("input").placeholder return empty string
var testInput = document.createElement('input');
testPlaceholderCompatibility = ('placeholder' in testInput);
Doesnt work in internet explorer 11 - return true
'placeholder'in document.createElement("input")
Doesnt work in internet explorer 11 - return true
In theory, Internet explorer 11 is supposed to support placeholder, but in fact - when input get focus placeholder disappear. In Chrome placeholder showed until you actually type something, no matter on focus. So, feature detection doesnt work in this case - you need to detect IE and show Labels.