Hide a div if content is empty

问题:

Philosophy bubble is like a quote/speech bubble div styled which has a sharepoint control inside, the richHtmlField which lets users to type in content while editing page, but if the user chooses to leave it empty, there will be no content in the div so only the bubble will show up in the page which will look funny so i wanna hide the whole div when there is no user entry or basically the div is empty?? How do you do this in jquery?

<div class="philosophy-bubble">
<PublishingWebControls:RichHtmlField FieldName="carephilosophy" runat="server"></PublishingWebControls:RichHtmlField>
</div>  

回答1:

Use jQuery's :empty selector:

$('.philosophy-bubble:empty').hide();

Here's a working fiddle.

Alternative

You could also use the filter() function to find all empty div's and hide:

//All divs
$('div').filter(function() {
        return $.trim($(this).text()) === ''
}).hide()

//div's with a certain class
$('.philosophy-bubble').filter(function() {
        return $.trim($(this).text()) === ''
}).hide()

//div with a specific ID
$('#YourDivID').filter(function() {
        return $.trim($(this).text()) === ''
}).hide()

..etc.

Note: the :empty selector will be more performant. See jsPerf.

回答2:

var myDiv =  $('#myDiv');

if (myDiv.text() == '')
{
    myDiv.hide();
}

回答3:

Something like:

if ($('.philosophy-bubble').is(":empty")){
    $('.philosophy-bubble').hide();
}

here is a fiddle: http://jsfiddle.net/IrvinDominin/XYr9T/1/

EDIT

better by using:

$('.philosophy-bubble:empty').hide()

http://jsfiddle.net/IrvinDominin/XYr9T/3/