Delete default value of an input text on click

Using jQuery, you can do:

$("input:text").each(function ()
{
    // store default value
    var v = this.value;

    $(this).blur(function ()
    {
        // if input is empty, reset value to default 
        if (this.value.length == 0) this.value = v;
    }).focus(function ()
    {
        // when input is focused, clear its contents
        this.value = "";
    }); 
});

And you could stuff all this into a custom plug-in, like so:

jQuery.fn.hideObtrusiveText = function ()
{
    return this.each(function ()
    {
        var v = this.value;

        $(this).blur(function ()
        {
            if (this.value.length == 0) this.value = v;
        }).focus(function ()
        {
            this.value = "";
        }); 
    });
};

Here's how you would use the plug-in:

$("input:text").hideObtrusiveText();

Advantages to using this code is:

• Its unobtrusive and doesn't pollute the DOM
• Code re-use: it works on multiple fields
• It figures out the default value of inputs by itself

Non-jQuery approach:

function hideObtrusiveText(id)
{
    var e = document.getElementById(id);

    var v = e.value;

    e.onfocus = function ()
    {
        e.value = "";
    };

    e.onblur = function ()
    {
        if (e.value.length == 0) e.value = v;
    };
}