Select2 add image icon to option dynamically

问题

This is what select2.github.io gives you:

function addIcons(opt) {
    if (!opt.id) {
        return opt.text;
    }
    var $opt = $(
            '<span><img src="/images/flags/' + opt.element.value.toLowerCase() + '.png" class="img-flag" /> ' + opt.text + '</span>'
            );
    return $opt;
}

I'd like to add a data-image attribute to my options:

<option value="flag" data-image="/images/flags/flag.png">Country 1</option>

and log it in the function:

function addIcons(opt) {
    if (!opt.id) {
        return opt.text;
    }

    var optimage = opt.attr('data-image');
    var $opt = $(
            '<span><img src="/images/flags/' + optimage + '" class="img-flag" /> ' + opt.text + '</span>'
            );
    return $opt;
}

Sadly, a simple console.log(opt); doesn't return anything in the function, so I can't see if I can access my data-image attribute. The above block of code returns an error, so this obviously doesn't work. Any suggestions on this matter?

回答1:

Solved using attr and tested on Select2 4.0.6-rc.0.

$(".class").select2({
    templateResult: formatState,
    templateSelection: formatState
});

function formatState (opt) {
    if (!opt.id) {
        return opt.text.toUpperCase();
    } 

    var optimage = $(opt.element).attr('data-image'); 
    console.log(optimage)
    if(!optimage){
       return opt.text.toUpperCase();
    } else {                    
        var $opt = $(
           '<span><img src="' + optimage + '" width="60px" /> ' + opt.text.toUpperCase() + '</span>'
        );
        return $opt;
    }
};

回答2:

If optimage returns "undefined" try my sample: its working fine:

$("#selectUserForChat").select2({
		templateResult: addUserPic,
        templateSelection: addUserPic
});
	
function addUserPic (opt) {
	if (!opt.id) {
		return opt.text;
	}               
	var optimage = $(opt.element).data('image'); 
	if(!optimage){
		return opt.text;
	} else {
		var $opt = $(
		'<span class="userName"><img src="' + optimage + '" class="userPic" /> ' + $(opt.element).text() + '</span>'
		);
		return $opt;
	}
};

回答3:

I solved problem with this code: var optimage = $(opt.element).data('image');

$(".category").select2({
            templateResult: formatState,
            templateSelection: formatState
        });
        function formatState (opt) {
            if (!opt.id) {
                return opt.text;
            }               
            var optimage = $(opt.element).data('image'); 
            if(!optimage){
                return opt.text;
            } else {                    
                var $opt = $(
                    '<span><img src="' + optimage + '" width="23px" /> ' + opt.text + '</span>'
                );
                return $opt;
            }

        };

回答4:

Try this:

var optimage = $(opt).data('image'); //or $(opt).attr('data-image')
var $opt = $(
    '<span><img src="' + optimage + '" class="img-flag" /> ' + $(opt).text() + '</span>'
);

回答5:

Not necessarily related to the question, but in my case it wasn't working because if you are using Select 2 < 4.0, templateResult and templateSelection does not exist. Use formatResult and formatSelection instead.

来源：https://stackoverflow.com/questions/29290389/select2-add-image-icon-to-option-dynamically