In some explorer won't show the file selection dialog

[magicgis]

In some explorer won't show the file selection dialog，because in the "_showDialog" function，the element input should putinto the document node，here is the original code:
ImageTool.prototype._showDialog = function() {
var acceptedMIMEStr = this.options.acceptedMIMETypes.join(',');
var $el = $('');
$el.on('change', this._processFileInput.bind(this));
$el.click();
};
and the below one will work:

ImageTool.prototype._showDialog = function() {
var acceptedMIMEStr = this.options.acceptedMIMETypes.join(',');
var $el = $('');
$el.on('change', this._processFileInput.bind(this));
$(document.body).append($el);
$el.click();
$(document.body).remove($el);
};

and also the BackgroundImageTool plugin in the "BackgroundImageTool.prototype._showDialog" function should modify as above。

[extremeCrazyCoder]

you could create a PR for that
didn't experience that myself, but I could think that some browsers are picky about that