Friday, January 9th, 2009
defaultValueActsAsHint
Thomas Fuchs has created defaultValueActsAsHint, an implementation of the Input Prompt pattern:
An often occuring UI pattern is “use the value of a textfield as hint what to input”. These fields all auto-clear when the user first focuses it (by clicking or tabbing it), and if nothing it entered, the hint will be shown once again once the user leaves it.
Because we decided to go this path for the “Quick entry” box we’re using for freckle time tracking, I dug out an older script I wrote and refreshed it a bit, and I present you defaultValueActsAsHint.
JAVASCRIPT:
This is all there’s to it, and the file to include is merely 18 lines of code. It works with textareas, too. Just specify whatever should be displayed as hint in the value attribute of the input (or as text within the textarea tag) and off you go. Define a ‘hint’ style if you like to show the text in gray, italics or whatever you fancy.
Check out the test sample that lives in his prototype_helpers library that also includes deferUntil.
jQuery users should check out ToggleVal. It’s currently at version 2.0.2, and has lots more options than just clearing/populating the inputs, such as conditional classes for styling, and clearing unchanged values on submit.
If you’re interested in a slightly more robust solution that doesn’t require you to manually call defaultValueActsAsHint() on each element you’d like to “hint”, you should check out my Ghostie project on Github (http://github.com/atnan/ghostie/tree/master), which allows you to add a CSS class of “ghostie” to any text/password field and it will automatically pull the value specified in the “title” attribute in as the default text. It also ensures that the default value is cleared if the form is submitted, and also adds a class of “ghostied” when the default value is populated so that you can style the default state easily.
In Jquery:
(function($){
$.fn.defaultValueActsAsHint = function(){
$(this).focus(function(){
if(this._default != this.value) return;
this.value = "";
}).removeClass('hint').blur(function(){
if(this.value != '') return;
this.value = this._default;
}).addClass('hint').get(0)._default = this.val();
};
})(jQuery);
For MooTools: http://www.clientcide.com/wiki/cnet-libraries/09-forms/05-overtext
An issue with using the
valueattribute is that it can be overwirtten when a user hits the back button after submitting the form, leaving your hint text as the value just submitted.I’ve published a jQuery implementation on GitHub that gets around this issue and the accessibility issue of not providing a
label– by default, it grabs the value from thelabeland moves thelabeloff-screen. You can override this behaviour if you want to use thevalueattribute, though.http://github.com/alexrabarts/jquery-clearinginput
I loved this implementation, but I agree further work would be nice to clear the values on form submission and supporting also select fields. Nice work,though.
It’s a flawed implementation, if you are halfway through a form and refresh the page then _default is set to the halfway value. Definately a bad bit of code! Kinda OK for freckle as the form is so small, but I’d reccomend against it.
Am I missing something, or is this virtually the same thing as this plugin – written 2 years ago:
http://remysharp.com/2007/01/25/jquery-tutorial-text-box-hints/
and:
http://www.alistapart.com/articles/makingcompactformsmoreaccessible
There’s another version that was written about 6-9 months ago too – but I can’t remember the link.
Have I missed the point – hasn’t this pattern been implemented time and time again?
Here’s an improved jQuery plugin that doesn’t use the value attribute because @oopstudio and @anewton’s concerns above. This version won’t change the value after a refresh since it uses a title attribute instead.
http://gist.github.com/46340
We’ve been doing this in schmedley on a bunch of our schmidgets and we’re using MooTools. After reading this article I was inspired to make a similar contribution – so, I made some quick edits to the code we’ve created and have posted an article with a MooTools class for this functionality on my site – http://dustincaruso.com/2009/01/defaultvalueactsashint/
It’s currently at version 2.0.2, and has lots more options than just clearing/populating the inputs, such as conditional classes for styling, and clearing unchanged values on submit.
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