问题描述:

I have the following: FIDDLE

The placeholder works fine and dandy until you type something, ctrl + A, and delete. If you do that, the placeholder disappears and never shows up again.

What's wrong? How can I have a placeholder for a contenteditable div?

HTML:

<div class="test" placeholder="Type something..." contenteditable="true"></div>


CSS:

.test {

width: 500px;

height: 70px;

background: #f5f5f5;

border: 1px solid #ddd;

padding: 5px;

}

.test[placeholder]:empty:before {

content: attr(placeholder);

color: #555;

}


Thanks.

网友答案:

While searching for the same problem i worked out a simple mixed css-javascript solution i'd like to share:

CSS:

[placeholder]:empty:before {
    content: attr(placeholder);
    color: #555; 
}

[placeholder]:empty:focus:before {
    content: "";
}

Javascript:

jQuery(function($){
    $("[contenteditable]").focusout(function(){
        var element = $(this);        
        if (!element.text().trim().length) {
            element.empty();
        }
    });
});

Updated fiddle

网友答案:

I see what you mean. In your fiddle I typed in a few characters and deleted it using 'ctrl-a' and 'delete', and the placeholder reappeared.

However, it seems as if when you hit 'enter' within the contenteditabele div it creates a child div containing the line break <div><br></div> creating an issue with the :empty pseudo-class which only targets elements with no child elements.**

Check it out in chrome developer tools or whatever you use.

From developer.mozilla.org

The :empty pseudo-class represents any element that has no children at all. Only element nodes and text (including whitespace) are considered. Comments or processing instructions do not affect whether an element is considered empty or not.

Ctrl-a will delete the text, but leaves the child div. Might be able to fix this by adding some javascript.

网友答案:

Updating Christian Brink's answer, you could/should check for more events. You can do so by simply doing:

// More descriptive name
var $input = $(".placeholder");
function clearPlaceHolder() {
  if ($input.text().length == 0) {
    $input.empty();
    }
  }

// On each click
$input.keyup(clearPlaceHolder);

// Probably not needed, but just in case
$input.click(clearPlaceHolder);

// Copy/paste/cut events http://stackoverflow.com/q/17796731
$input.bind('input', (clearPlaceHolder));

// Other strange events (javascript modification of value?)
$input.change(clearPlaceHolder);

Finally, the updated JSFiddle

网友答案:

As swifft said, you can fix this with some super simple JS. Using jQuery:

var $input = $(".test");
$input.keyup(function () {
    if ($input.text().length == 0) {
        $input.empty();
    }
});

On each keystroke it checks whether there's any input text present. If not, it whacks any child elements that may have been left behind by user interaction with the element -- e.g. the <div> swifft describes.

网友答案:

It feels like I am repeating myself, but why not to check contenteditable element mutations? Trying to bind everything to event that are changing content are pain in the butt. What if You need to add button (For example paste), or change content dynamically (javascript). My approach would be using MutationObservers. Demo fiddle

HTML:

<div class="test" id="test" placeholder="Type something..." contenteditable="true"></div>

CSS:

.test {
    width: 500px;
    height: 70px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    padding: 5px;
}

.test[placeholder]:empty:before {
    content: attr(placeholder);
    color: #555; 
}

JavaScript:

var target = document.querySelector('#test');
var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
      if (target.textContent == '') {
          target.innerHTML = '';
      }
  });    
});
var config = { attributes: true, childList: true, characterData: true };
observer.observe(target, config);
网友答案:

some fixes:

1) $element.text().trim().length - it solved problems with <div><br/></div> and &nbsp;

2) data-placeholder attr instead of placeholder - it is true way

3) common selector $("[contenteditable]") - it is true way

4) display: inline-block; - fix for Chrome and Firefox

JavaScript:

jQuery(function($){
    $("[contenteditable]").blur(function(){
        var $element = $(this);
        if ($element.html().length && !$element.text().trim().length) {
            $element.empty();
        }
    });
});

HTML:

<div data-placeholder="Type something..." contenteditable="true"></div>

CSS:

[contenteditable]:empty:before {
    content: attr(data-placeholder);
    color: grey;
    display: inline-block;
}
网友答案:

I have this function, and I always use to prevent this kind of things.

I use my function in this way:

var notEmpty = {}

    notEmpty.selector = ".no-empty-plz"
    notEmpty.event = "focusout"
    notEmpty.nonEmpty = "---"


    neverEmpty(notEmpty)

And I just add the no-empty-plz to the Elements I that don't want to be empty.

/**
     * Used to prevent a element have a empty content, made to be used 
when we want to edit the content directly with the contenteditable=true 
because when a element is completely empty, it disappears U_U
     * 
     * @param selector
     * @param event
     * @param nonEmpty:
     *        String to be put instead empty
     */
function neverEmpty(params) {

    var element = $(params.selector)



    $(document).on(params.event, params.selector, function() {

        var text = $(this).html()
        text = hardTrim(text)

        if ($.trim(text)  == "") {
            $(this).html(params.nonEmpty)
        }
    });
}

params is actually a json, so selector = params.selector as you can see

And hardTrim is also another fucntion I created is like a trim but includs &nbsp and <br/>, etc

function hardTrim(text) {

    if (!exists(text)) {
        return ""
    }
    text = text.replace(/^\&nbsp\;|<br?\>*/gi, "").replace(/\&nbsp\;|<br?\>$/gi, "").trim();

    return text
}
网友答案:

from Placeholder in contenteditable - focus event issue

[contentEditable=true]:empty:not(:focus):before{
  content:attr(data-ph);
  color:grey;
  font-style:italic;
}
网友答案:
<div id="write_comment" contenteditable="true"></div>

var placeholderCommentText = 'Comment...',
    placeholderComment = $('#write_comment').attr('placeholder', placeholderCommentText);

$('#write_comment').text(placeholderCommentText);

$('[contenteditable]').bind({
    focus: function(){
        if ($('#write_comment').text().length == 0 || $('#write_comment').text() == $('#write_comment').attr('placeholder')) {
            $(this).empty();
        }
        $(this).keyup(function(){
            if ($('#write_comment').text() == $('#write_comment').attr('placeholder')){
                $('#write_comment').attr('placeholder','');
            } else if ($('#write_comment').text().length == 0 ) {
                $('#write_comment').attr('placeholder', placeholderCommentText);
            }
        });
    },
    focusout: function(){
        if ($('#write_comment').text().length == 0) { 
            $(this).text($(this).attr('placeholder'));
        }
    }
});
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