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I am working through the examples in chapter 8 of the Ruby on Rails Tutorial and I am getting the above error on my pages, and my dropdown menu isn't working. Any ideas on how I can fix this?
/* ===================================================
* bootstrap-transition.js v2.0.0
* http://twitter.github.com/bootstrap/javascript.html#transitions
* ===================================================
* Copyright 2012 Twitter, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ========================================================== */
!function( $ ) {
$(function () {
"use strict"
/* CSS TRANSITION SUPPORT (https://gist.github.com/373874)
* ======================================================= */
$.support.transition = (function () {
var thisBody = document.body || document.documentElement
, thisStyle = thisBody.style
, support = thisStyle.transition !== undefined || thisStyle.WebkitTransition !== undefined || thisStyle.MozTransition !== undefined || thisStyle.MsTransition !== undefined || thisStyle.OTransition !== undefined
return support && {
end: (function () {
var transitionEnd = "TransitionEnd"
if ( $.browser.webkit ) {
Uncaught TypeError: Cannot read property 'webkit' of undefined
transitionEnd = "webkitTransitionEnd"
} else if ( $.browser.mozilla ) {
transitionEnd = "transitionend"
} else if ( $.browser.opera ) {
transitionEnd = "oTransitionEnd"
}
return transitionEnd
}())
}
})()
})
}(window.jQuery);
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The “cannot read property of undefined” error occurs when you attempt to access a property or method of a variable that is undefined . You can fix it by adding an undefined check on the variable before accessing it.
Undefined means that a variable has been declared but has not been assigned a value. In JavaScript, properties and functions can only belong to objects. Since undefined is not an object type, calling a function or a property on such a variable causes the TypeError: Cannot read property of undefined .
To solve the "Cannot read property 'value' of null" error, make sure you aren't accessing the value property on a null value, e.g. a non-existent DOM element. An element with the provided id does not exist in the DOM, so the getElementById method returns null .
The problem I think is this bit here: $.browser.webkit - apparently $.browser has been removed in jQuery 1.9+.
According to this thread there is no direct replacement, however by using this plugin you should be able to restore the functionality of that tag.
145
Upgrade your bootstrap-sass gem to the most recent version by updating your Gemfile with the line:
gem 'bootstrap-sass', '~> 2.3.0.1'
I was having issues and it was because I was running version 2.0.0 of that gem. Not sure what version they recommend running in the tutorial, but upgrading to the most recent version shouldn't hurt you.
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