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Firing javascript event based on time of day

I'm looking for help to see if there is an easy quick way to fire a JS event based on the time of day a website opens in the browser.
Essentially what I want to do is between 5pm-5am of the users local time zone have this script fire. The script is currently wired to a button that simply flips the class of the body of the page to "night mode". I would like the two to work in harmony, automate based on time and the ability to override with the button if you want the dark or light theme.
function toggleClass(element, className) {
if (!element || !className) {
return;
}
var classString = element.className,
nameIndex = classString.indexOf(className);
if (nameIndex == -1) {
classString += ' ' + className;
} else {
classString = classString.substr(0, nameIndex) + classString.substr(nameIndex + className.length);
}
element.className = classString;
}
document.getElementById('day-btn').addEventListener('click', function() {
toggleClass(document.getElementById('body'), 'night');
});
https://jsfiddle.net/simpson/57xe333n/2/

var time = new Date();
element = document.getElementById('body');
className = "night";
console.log(time.getHours());
if(time.getHours() > 17 || time.getHours < 5) {
if (!element || !className) {
return;
}
var classString = element.className,
nameIndex = classString.indexOf(className);
if (nameIndex == -1) {
classString += ' ' + className;
} else {
classString = classString.substr(0, nameIndex) + classString.substr(nameIndex + className.length);
}
element.className = classString;
}
This uses JS's built in Date functionalities which pull from the system. It runs a getHours() function which returns an int(0-23). The if statement (time.getHours() > 17 || time.getHours < 5) will then only run the code and change the theme if it is after 5pm or before 5 am. Hope this can get you started.

Angularjs ng-bind-html with custom Filter

I am currently working with ng-bind-html. Basically, what I am trying to do is, when I post a blog, the blog contains links and other styling. So when I am trying to show the list of blogs, I am using ng-bing-html like this:
<p ng-bind-html="blog.blogContent"></p>
which works fine.
But in addition, I try to truncate the blog and show only few paragraphs with view more option by passing a custom filter. But when I pass the filter I get the following:
<p ng-bind-html="blog.blogContent | Truncate"></p>
Error: [$sanitize:badparse] The sanitizer was unable to parse the
following block of html: <a href="https:.......
My Filter looks like this:
return function (text, length, end) {
if (text !== undefined) {
if (isNaN(length)) {
length = 450;
}
if (end === undefined) {
end = ".......";
}
if (text.length <= length || text.length - end.length <= length) {
return text;
} else {
return String(text).substring(0, length - end.length) + end;
}
}

You can solve this using custom directives and filters. try this one: https://stackoverflow.com/a/45076560/6816707

I used the solution posted by Minouris in this post (Javascript truncate HTML text) and adapted it into an AngularJS filter. It seems to work pretty well. The filter is
angular.module('plunker').filter('Truncate', function() {
return function(text, length, end) {
if (text !== undefined) {
if (isNaN(length)) {
length = 20;
}
if (end === undefined) {
end = ".......";
}
if (text.length <= length || text.length - end.length <= length) {
return text;
}
var truncated = text.substring(0, length);
// Remove line breaks and surrounding whitespace
truncated = truncated.replace(/(\r\n|\n|\r)/gm,"").trim();
// If the text ends with an incomplete start tag, trim it off
truncated = truncated.replace(/<(\w*)(?:(?:\s\w+(?:={0,1}(["']{0,1})\w*\2{0,1})))*$/g, '');
// If the text ends with a truncated end tag, fix it.
var truncatedEndTagExpr = /<\/((?:\w*))$/g;
var truncatedEndTagMatch = truncatedEndTagExpr.exec(truncated);
if (truncatedEndTagMatch != null) {
var truncatedEndTag = truncatedEndTagMatch[1];
// Check to see if there's an identifiable tag in the end tag
if (truncatedEndTag.length > 0) {
// If so, find the start tag, and close it
var startTagExpr = new RegExp(
"<(" + truncatedEndTag + "\\w?)(?:(?:\\s\\w+(?:=([\"\'])\\w*\\2)))*>");
var testString = truncated;
var startTagMatch = startTagExpr.exec(testString);
var startTag = null;
while (startTagMatch != null) {
startTag = startTagMatch[1];
testString = testString.replace(startTagExpr, '');
startTagMatch = startTagExpr.exec(testString);
}
if (startTag != null) {
truncated = truncated.replace(truncatedEndTagExpr, '</' + startTag + '>');
}
} else {
// Otherwise, cull off the broken end tag
truncated = truncated.replace(truncatedEndTagExpr, '');
}
}
// Now the tricky part. Reverse the text, and look for opening tags. For each opening tag,
// check to see that he closing tag before it is for that tag. If not, append a closing tag.
var testString = reverseHtml(truncated);
var reverseTagOpenExpr = /<(?:(["'])\w*\1=\w+ )*(\w*)>/;
var tagMatch = reverseTagOpenExpr.exec(testString);
while (tagMatch != null) {
var tag = tagMatch[0];
var tagName = tagMatch[2];
var startPos = tagMatch.index;
var endPos = startPos + tag.length;
var fragment = testString.substring(0, endPos);
// Test to see if an end tag is found in the fragment. If not, append one to the end
// of the truncated HTML, thus closing the last unclosed tag
if (!new RegExp("<" + tagName + "\/>").test(fragment)) {
truncated += '</' + reverseHtml(tagName) + '>';
}
// Get rid of the already tested fragment
testString = testString.replace(fragment, '');
// Get another tag to test
tagMatch = reverseTagOpenExpr.exec(testString);
}
return truncated;
}
}
function reverseHtml(str) {
var ph = String.fromCharCode(206);
var result = str.split('').reverse().join('');
while (result.indexOf('<') > -1) {
result = result.replace('<',ph);
}
while (result.indexOf('>') > -1) {
result = result.replace('>', '<');
}
while (result.indexOf(ph) > -1) {
result = result.replace(ph, '>');
}
return result;
}
});
Working plunkr:
http://plnkr.co/edit/oCwmGyBXB26omocT2q9m?p=preview
I havent tested the above solution and you may run into issues with more complicated HTML strings. May I suggest using a Jquery library like https://github.com/pathable/truncate to be safe?

Checking a div for duplicates before appending to the list using jQuery

This should be trivial but I'm having issues...
Basically what I am trying to do is append a new "div" to "selected-courses" when a user clicks on a "course". This should happen if and only if the current course is not already in the "selected-courses" box.
The problem I'm running into is that nothing is appended to the "selected-courses" section when this is executed. I have used alert statements to make sure the code is in fact being run. Is there something wrong with my understanding of the way .on and .each work ? can I use them this way.
Here is a fiddle http://jsfiddle.net/jq9dth4j/
$(document).on("click", "div.course", function() {
var title = $( this ).find("span").text();
var match_found = 0;
//if length 0 nothing in list, no need to check for a match
if ($(".selected-course").length > 0) {
match_found = match(title);
}
if (matched == 0) {
var out = '<div class="selected-course">' + '' + title + ''+'</div>';
$("#selected-box").append(out);
}
});
//checks to see if clicked course is already in list before adding.
function match(str) {
$(".selected-course").each(function() {
var retval = 0;
if(str == this.text()) {
//course already in selected-course section
retval = 1;
return false;
}
});
return retval;
}

There was a couple of little issues in your fiddle.
See fixed fiddle: http://jsfiddle.net/jq9dth4j/1/
function match(str) {
var retval = 0;
$(".selected-course").each(function() {
if(str == $(this).text()) {
retval = 1;
return false;
}
});
return retval;
}
You hadn't wrapped your this in a jquery object. So it threw an exception saying this had no method text().
Second your retval was declared inside the each so it wasn't available to return outside the each, wrong scope.
Lastly the if in the block:
if (matched== 0) {
var out = '';
out += '<div class="selected-course">' + '' + title + ''+'</div>';
$("#selected-box").append(out);
}
was looking at the wrong variable it was looking at matched which didn't exist causing an exception.

Relying on checking what text elements contain is not the best approach to solve this kind of question. It is prone to errors (as you have found out), it can be slow, it gives you long code and it is sensitive to small changes in the HTML. I would recommend using custom data-* attributes instead.
So you would get HTML like this:
<div class="course" data-course="Kite Flying 101">
<a href="#">
<span>Kite Flying 101</span>
</a>
</div>
Then the JS would be simple like this:
$(document).on('click', 'div.course', function() {
// Get the name of the course that was clicked from the attribute.
var title = $(this).attr('data-course');
// Create a selector that selects everything with class selected-course and the right data-course attribute.
var selector = '.selected-course[data-course="' + title + '"]';
if($(selector).length == 0) {
// If the selector didn't return anything, append the div.
// Do note that we need to add the data-course attribute here.
var out = '<div class="selected-course" data-course="' + title + '">' + title + '</div>';
$('#selected-box').append(out);
}
});
Beware of case sensitivity in course names, though!
Here is a working fiddle.

Try this code, read comment for where the changes are :
$(document).on("click", "div.course", function () {
var title = $(this).find("span").text().trim(); // use trim to remove first and end whitespace
var match_found = 0;
if ($(".selected-course").length > 0) {
match_found = match(title);
}
if (match_found == 0) { // should change into match_found
var out = '';
out += '<div class="selected-course">' + '' + title + '' + '</div>';
$("#selected-box").append(out);
}
});
function match(str) {
var retval = 0; // this variable should place in here
$(".selected-course").each(function () {
if (str == $(this).find('a').text().trim()) { // find a tag to catch values, and use $(this) instead of this
retval = 1;
return false;
}
});
return retval; // now can return variable, before will return undefined
}
Updated DEMO

Your Issues are :
1.this.text() is not valid. you have to use $(this).text().
2.you defined var retval = 0; inside each statement and trying to return it outside each statement. so move this line out of the each statement.
3.matched is not defined . it should be match_found in line if (matched == 0) {.
4. use trim() to get and set text, because text may contain leading and trailing spaces.
Your updated JS is
$(document).on("click", "div.course", function () {
var title = $(this).find("span").text();
var match_found = 0;
if ($(".selected-course").length > 0) {
match_found = match(title);
}
if (match_found == 0) {
var out = '<div class="selected-course">' + '' + title + '' + '</div>';
$("#selected-box").append(out);
}
});
function match(str) {
var retval = 0;
$(".selected-course").each(function () {
if (str.trim() == $(this).text().trim()) {
retval = 1;
return false;
}
});
return retval;
}
Updated you Fiddle

Why html-element text doesn't replace?

I use javascript (jQuery) to toggle text of html-element (span):
function TextToogle(element, text) {
if (element.html() == '-' + text) {
element.html(text.replace(element.html(), '+' + text));
}
else {
element.html(text.replace(element.html(), '-' + text));
}
}
I give two arguments for my function:
1) element - html Object
2) text - default text of span
My goal is toggle the span text from "+text" to "-text" and vice versa.
But script doesn't work correctly. When function toggle text to "+text", as result I see "text". The toggle to "-text" works correctly.

I would just replace inside a callback, seems so much simpler
element.text(function(_, txt) {
return txt.replace(/[+-]/g, function(x) {
return x == '+' ? '-' : '+';
});
});
FIDDLE

Based on you is comparison (element.html() == '-' + text) your function can be simpler. You don't need text.replace(element.html(), '+' + text) part:
function TextToogle(element, text) {
if (element.text() == '-' + text) {
element.text('+' + text);
}
else {
element.text('-' + text);
}
}
However relying on text comparison is not ideal. I would use CSS which is not text dependent:
$('.text-toggle').click(function() {
$(this).toggleClass('active');
});
CSS
.text-toggle:before {
content: '+';
}
.text-toggle.active:before {
content: '-';
}
There is obvious advantage here is that you can style your +/- easily, you can set a background image, chage font-size, etc. While you would'n be able this with your original approach.
Demo: http://jsfiddle.net/dfsq/mvj5c/

function toggleText(text) {
return {'-':'+', '+':'-'}[text[0]]+text.slice(1);
}
element.html(toggleText(element.html()));

See simple example.
You've text -abc. Now it's fail on both of the checks.
Why not do this
function TextToogle(element, text) {
var check = text.splice(0, 1);
if (check === "-") {
element.html("+" + text.substring(1, text.length));
}
else {
element.html("-" + text.substring(1, text.length));
}
}

try this code
$('span').click(function(){
var
$this = $(this),
thisText = $this.text();
$this.text($this.text() === "-" + thisText ? ("+" + thisText) : ("-" + thisText));
});

Get the DOM path of the clicked <a>

HTML
<body>
<div class="lol">
<a class="rightArrow" href="javascriptVoid:(0);" title"Next image">
</div>
</body>
Pseudo Code
$(".rightArrow").click(function() {
rightArrowParents = this.dom(); //.dom(); is the pseudo function ... it should show the whole
alert(rightArrowParents);
});
Alert message would be:
body div.lol a.rightArrow
How can I get this with javascript/jquery?

Here is a native JS version that returns a jQuery path. I'm also adding IDs for elements if they have them. This would give you the opportunity to do the shortest path if you see an id in the array.
var path = getDomPath(element);
console.log(path.join(' > '));
Outputs
body > section:eq(0) > div:eq(3) > section#content > section#firehose > div#firehoselist > article#firehose-46813651 > header > h2 > span#title-46813651
Here is the function.
function getDomPath(el) {
var stack = [];
while ( el.parentNode != null ) {
console.log(el.nodeName);
var sibCount = 0;
var sibIndex = 0;
for ( var i = 0; i < el.parentNode.childNodes.length; i++ ) {
var sib = el.parentNode.childNodes[i];
if ( sib.nodeName == el.nodeName ) {
if ( sib === el ) {
sibIndex = sibCount;
}
sibCount++;
}
}
if ( el.hasAttribute('id') && el.id != '' ) {
stack.unshift(el.nodeName.toLowerCase() + '#' + el.id);
} else if ( sibCount > 1 ) {
stack.unshift(el.nodeName.toLowerCase() + ':eq(' + sibIndex + ')');
} else {
stack.unshift(el.nodeName.toLowerCase());
}
el = el.parentNode;
}
return stack.slice(1); // removes the html element
}

Using jQuery, like this (followed by a solution that doesn't use jQuery except for the event; lots fewer function calls, if that's important):
$(".rightArrow").click(function () {
const rightArrowParents = [];
$(this)
.parents()
.addBack()
.not("html")
.each(function () {
let entry = this.tagName.toLowerCase();
const className = this.className.trim();
if (className) {
entry += "." + className.replace(/ +/g, ".");
}
rightArrowParents.push(entry);
});
console.log(rightArrowParents.join(" "));
return false;
});
Live example:
$(".rightArrow").click(function () {
const rightArrowParents = [];
$(this)
.parents()
.addBack()
.not("html")
.each(function () {
let entry = this.tagName.toLowerCase();
const className = this.className.trim();
if (className) {
entry += "." + className.replace(/ +/g, ".");
}
rightArrowParents.push(entry);
});
console.log(rightArrowParents.join(" "));
return false;
});
<div class=" lol multi ">
Click here
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
(In the live examples, I've updated the class attribute on the div to be lol multi to demonstrate handling multiple classes.)
That uses parents to get the ancestors of the element that was clicked, removes the html element from that via not (since you started at body), then loops through creating entries for each parent and pushing them on an array. Then we use addBack to add the a back into the set, which also changes the order of the set to what you wanted (parents is special, it gives you the parents in the reverse of the order you wanted, but then addBack puts it back in DOM order). Then it uses Array#join to create the space-delimited string.
When creating the entry, we trim className (since leading and trailing spaces are preserved, but meaningless, in the class attribute), and then if there's anything left we replace any series of one or more spaces with a . to support elements that have more than one class (<p class='foo bar'> has className = "foo bar", so that entry ends up being p.foo.bar).
Just for completeness, this is one of those places where jQuery may be overkill, you can readily do this just by walking up the DOM:
$(".rightArrow").click(function () {
const rightArrowParents = [];
for (let elm = this; elm; elm = elm.parentNode) {
let entry = elm.tagName.toLowerCase();
if (entry === "html") {
break;
}
const className = elm.className.trim();
if (className) {
entry += "." + className.replace(/ +/g, ".");
}
rightArrowParents.push(entry);
}
rightArrowParents.reverse();
console.log(rightArrowParents.join(" "));
return false;
});
Live example:
$(".rightArrow").click(function () {
const rightArrowParents = [];
for (let elm = this; elm; elm = elm.parentNode) {
let entry = elm.tagName.toLowerCase();
if (entry === "html") {
break;
}
const className = elm.className.trim();
if (className) {
entry += "." + className.replace(/ +/g, ".");
}
rightArrowParents.push(entry);
}
rightArrowParents.reverse();
console.log(rightArrowParents.join(" "));
return false;
});
<div class=" lol multi ">
Click here
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
There we just use the standard parentNode property (or we could use parentElement) of the element repeatedly to walk up the tree until either we run out of parents or we see the html element. Then we reverse our array (since it's backward to the output you wanted), and join it, and we're good to go.

I needed a native JS version, that returns CSS standard path (not jQuery), and deals with ShadowDOM. This code is a minor update on Michael Connor's answer, just in case someone else needs it:
function getDomPath(el) {
if (!el) {
return;
}
var stack = [];
var isShadow = false;
while (el.parentNode != null) {
// console.log(el.nodeName);
var sibCount = 0;
var sibIndex = 0;
// get sibling indexes
for ( var i = 0; i < el.parentNode.childNodes.length; i++ ) {
var sib = el.parentNode.childNodes[i];
if ( sib.nodeName == el.nodeName ) {
if ( sib === el ) {
sibIndex = sibCount;
}
sibCount++;
}
}
// if ( el.hasAttribute('id') && el.id != '' ) { no id shortcuts, ids are not unique in shadowDom
// stack.unshift(el.nodeName.toLowerCase() + '#' + el.id);
// } else
var nodeName = el.nodeName.toLowerCase();
if (isShadow) {
nodeName += "::shadow";
isShadow = false;
}
if ( sibCount > 1 ) {
stack.unshift(nodeName + ':nth-of-type(' + (sibIndex + 1) + ')');
} else {
stack.unshift(nodeName);
}
el = el.parentNode;
if (el.nodeType === 11) { // for shadow dom, we
isShadow = true;
el = el.host;
}
}
stack.splice(0,1); // removes the html element
return stack.join(' > ');
}

Here is a solution for exact matching of an element.
It is important to understand that the selector (it is not a real one) that the chrome tools show do not uniquely identify an element in the DOM. (for example it will not distinguish between a list of consecutive span elements. there is no positioning/indexing info)
An adaptation from a similar (about xpath) answer
$.fn.fullSelector = function () {
var path = this.parents().addBack();
var quickCss = path.get().map(function (item) {
var self = $(item),
id = item.id ? '#' + item.id : '',
clss = item.classList.length ? item.classList.toString().split(' ').map(function (c) {
return '.' + c;
}).join('') : '',
name = item.nodeName.toLowerCase(),
index = self.siblings(name).length ? ':nth-child(' + (self.index() + 1) + ')' : '';
if (name === 'html' || name === 'body') {
return name;
}
return name + index + id + clss;
}).join(' > ');
return quickCss;
};
And you can use it like this
console.log( $('some-selector').fullSelector() );
Demo at http://jsfiddle.net/gaby/zhnr198y/

The short vanilla ES6 version I ended up using:
Returns the output I'm used to read in Chrome inspector e.g body div.container input#name
function getDomPath(el) {
let nodeName = el.nodeName.toLowerCase();
if (el === document.body) return 'body';
if (el.id) nodeName += '#' + el.id;
else if (el.classList.length)
nodeName += '.' + [...el.classList].join('.');
return getDomPath(el.parentNode) + ' ' + nodeName;
};

I moved the snippet from T.J. Crowder to a tiny jQuery Plugin. I used the jQuery version of him even if he's right that this is totally unnecessary overhead, but i only use it for debugging purpose so i don't care.
Usage:
Html
<html>
<body>
<!-- Two spans, the first will be chosen -->
<div>
<span>Nested span</span>
</div>
<span>Simple span</span>
<!-- Pre element -->
<pre>Pre</pre>
</body>
</html>
Javascript
// result (array): ["body", "div.sampleClass"]
$('span').getDomPath(false)
// result (string): body > div.sampleClass
$('span').getDomPath()
// result (array): ["body", "div#test"]
$('pre').getDomPath(false)
// result (string): body > div#test
$('pre').getDomPath()
Repository
https://bitbucket.org/tehrengruber/jquery.dom.path

I've been using Michael Connor's answer and made a few improvements to it.
Using ES6 syntax
Using nth-of-type instead of nth-child, since nth-of-type looks for children of the same type, rather than any child
Removing the html node in a cleaner way
Ignoring the nodeName of elements with an id
Only showing the path until the closest id, if any. This should make the code a bit more resilient, but I left a comment on which line to remove if you don't want this behavior
Use CSS.escape to handle special characters in IDs and node names
~
export default function getDomPath(el) {
const stack = []
while (el.parentNode !== null) {
let sibCount = 0
let sibIndex = 0
for (let i = 0; i < el.parentNode.childNodes.length; i += 1) {
const sib = el.parentNode.childNodes[i]
if (sib.nodeName === el.nodeName) {
if (sib === el) {
sibIndex = sibCount
break
}
sibCount += 1
}
}
const nodeName = CSS.escape(el.nodeName.toLowerCase())
// Ignore `html` as a parent node
if (nodeName === 'html') break
if (el.hasAttribute('id') && el.id !== '') {
stack.unshift(`#${CSS.escape(el.id)}`)
// Remove this `break` if you want the entire path
break
} else if (sibIndex > 0) {
// :nth-of-type is 1-indexed
stack.unshift(`${nodeName}:nth-of-type(${sibIndex + 1})`)
} else {
stack.unshift(nodeName)
}
el = el.parentNode
}
return stack
}

All the examples from other ответов did not work very correctly for me, I made my own, maybe my version will be more suitable for the rest
const getDomPath = element => {
let templateElement = element
, stack = []
for (;;) {
if (!!templateElement) {
let attrs = ''
for (let i = 0; i < templateElement.attributes.length; i++) {
const name = templateElement.attributes[i].name
if (name === 'class' || name === 'id') {
attrs += `[${name}="${templateElement.getAttribute(name)}"]`
}
}
stack.push(templateElement.tagName.toLowerCase() + attrs)
templateElement = templateElement.parentElement
} else {
break
}
}
return stack.reverse().slice(1).join(' > ')
}
const currentElement = document.querySelectorAll('[class="serp-item__thumb justifier__thumb"]')[7]
const path = getDomPath(currentElement)
console.log(path)
console.log(document.querySelector(path))
console.log(currentElement)

var obj = $('#show-editor-button'),
path = '';
while (typeof obj.prop('tagName') != "undefined"){
if (obj.attr('class')){
path = '.'+obj.attr('class').replace(/\s/g , ".") + path;
}
if (obj.attr('id')){
path = '#'+obj.attr('id') + path;
}
path = ' ' +obj.prop('tagName').toLowerCase() + path;
obj = obj.parent();
}
console.log(path);

hello this function solve the bug related to current element not show in the path
check this now
$j(".wrapper").click(function(event) {
selectedElement=$j(event.target);
var rightArrowParents = [];
$j(event.target).parents().not('html,body').each(function() {
var entry = this.tagName.toLowerCase();
if (this.className) {
entry += "." + this.className.replace(/ /g, '.');
}else if(this.id){
entry += "#" + this.id;
}
entry=replaceAll(entry,'..','.');
rightArrowParents.push(entry);
});
rightArrowParents.reverse();
//if(event.target.nodeName.toLowerCase()=="a" || event.target.nodeName.toLowerCase()=="h1"){
var entry = event.target.nodeName.toLowerCase();
if (event.target.className) {
entry += "." + event.target.className.replace(/ /g, '.');
}else if(event.target.id){
entry += "#" + event.target.id;
}
rightArrowParents.push(entry);
// }
where $j = jQuery Variable
also solve the issue with .. in class name
here is replace function :
function escapeRegExp(str) {
return str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
}
function replaceAll(str, find, replace) {
return str.replace(new RegExp(escapeRegExp(find), 'g'), replace);
}
Thanks

$(".rightArrow")
.parents()
.map(function () {
var value = this.tagName.toLowerCase();
if (this.className) {
value += '.' + this.className.replace(' ', '.', 'g');
}
return value;
})
.get().reverse().join(", ");