How to check if element contains string after converting everything to lowercase - javascript

I'm using a simple input field to search through a list on my website using this code:
$('#f-search').keyup(function() {
var q = $('#f-search').val().toLowerCase();
$("#f-list .f // toLowerCase // :contains('q')").css('border-color', '#900');
My problem is that the list elements (.f) contain unpredictable capital letters, so in order to accurately check it against the input I need to convert it to lower case, but I don't know how to do that and then use :contains. For example, if one .f contains "WoWoWoWoWzzzziees" but the user typed "wow", it wouldn't be a match with my current code, but I'd like it to be.

What you want is:
$("#f-list .f").filter(function() {
return $(this)
.text() // or .html() or .val(), depends on the element type
.indexOf(q) != -1;
}).css('border-color', '#900');
which compares the text inside your elements selected by "#f-list .f" and, if they contain what is in the q variable, they get the css modification applied.
If you also want the list to be reset each time, you can do this:
$("#f-list .f").css('border-color', 'WHATEVER IT WAS').filter(function() {
return $(this)
.text() // or .html() or .val(), depends on the element type
.indexOf(q) != -1;
}).css('border-color', '#900');
For better performance you could cache your list like this:
var f_list = $("#f-list .f"),
f_search = $('#f-search');
f_search.keyup(function() {
var q = f_search.val().toLowerCase();
f_list.css('border-color', 'WHATEVER IT WAS').filter(function() {
return $(this)
.text() // or .html() or .val(), depends on the element type
.indexOf(q) != -1;
}).css('border-color', '#900');

You can go as far as creating your own custom :contains selector in jQuery:
From here and here and here:
jQuery.expr[":"].Contains = jQuery.expr.createPseudo(function(arg) {
return function( elem ) {
return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
And use it like this (please note the new selector is :Contains with uppercase C):
$("#f-list .f:Contains('q')").css('border-color', '#900');


Finding HTML tags by using `content`'s of them from a Google Chrome extension [duplicate]

How can I find DIV with certain text? For example:
SomeText, text continues.
Trying to use something like this:
var text = document.querySelector('div[SomeText*]').innerTEXT;
But ofcourse it will not work. How can I do it?
OP's question is about plain JavaScript and not jQuery.
Although there are plenty of answers and I like #Pawan Nogariya answer, please check this alternative out.
You can use XPATH in JavaScript. More info on the MDN article here.
The document.evaluate() method evaluates an XPATH query/expression. So you can pass XPATH expressions there, traverse into the HTML document and locate the desired element.
In XPATH you can select an element, by the text node like the following, whch gets the div that has the following text node.
//div[text()="Hello World"]
To get an element that contains some text use the following:
//div[contains(., 'Hello')]
The contains() method in XPATH takes a node as first parameter and the text to search for as second parameter.
Check this plunk here, this is an example use of XPATH in JavaScript
Here is a code snippet:
var headings = document.evaluate("//h1[contains(., 'Hello')]", document, null, XPathResult.ANY_TYPE, null );
var thisHeading = headings.iterateNext();
console.log(thisHeading); // Prints the html element in console
console.log(thisHeading.textContent); // prints the text content in console
thisHeading.innerHTML += "<br />Modified contents";
As you can see, I can grab the HTML element and modify it as I like.
You could use this pretty simple solution:
.find(el => el.textContent === 'SomeText, text continues.');
The Array.from will convert the NodeList to an array (there are multiple methods to do this like the spread operator or slice)
The result now being an array allows for using the Array.find method, you can then put in any predicate. You could also check the textContent with a regex or whatever you like.
Note that Array.from and Array.find are ES2015 features. Te be compatible with older browsers like IE10 without a transpiler:'div'))
.filter(function (el) {
return el.textContent === 'SomeText, text continues.'
Since you have asked it in javascript so you can have something like this
function contains(selector, text) {
var elements = document.querySelectorAll(selector);
return, function(element){
return RegExp(text).test(element.textContent);
And then call it like this
contains('div', 'sometext'); // find "div" that contain "sometext"
contains('div', /^sometext/); // find "div" that start with "sometext"
contains('div', /sometext$/i); // find "div" that end with "sometext", case-insensitive
This solution does the following:
Uses the ES6 spread operator to convert the NodeList of all divs to an array.
Provides output if the div contains the query string, not just if it exactly equals the query string (which happens for some of the other answers). e.g. It should provide output not just for 'SomeText' but also for 'SomeText, text continues'.
Outputs the entire div contents, not just the query string. e.g. For 'SomeText, text continues' it should output that whole string, not just 'SomeText'.
Allows for multiple divs to contain the string, not just a single div.
[...document.querySelectorAll('div')] // get all the divs in an array
.map(div => div.innerHTML) // get their contents
.filter(txt => txt.includes('SomeText')) // keep only those containing the query
.forEach(txt => console.log(txt)); // output the entire contents of those
<div>SomeText, text continues.</div>
<div>Not in this div.</div>
<div>Here is more SomeText.</div>
Coming across this in 2021, I found using XPATH too complicated (need to learn something else) for something that should be rather simple.
Came up with this:
function querySelectorIncludesText (selector, text){
return Array.from(document.querySelectorAll(selector))
.find(el => el.textContent.includes(text));
querySelectorIncludesText('button', 'Send')
Note that I decided to use includes and not a strict comparison, because that's what I really needed, feel free to adapt.
You might need those polyfills if you want to support all browsers:
* String.prototype.includes() polyfill
* #see
if (!String.prototype.includes) {
String.prototype.includes = function (search, start) {
'use strict';
if (search instanceof RegExp) {
throw TypeError('first argument must not be a RegExp');
if (start === undefined) {
start = 0;
return this.indexOf(search, start) !== -1;
You best see if you have a parent element of the div you are querying. If so get the parent element and perform an element.querySelectorAll("div"). Once you get the nodeList apply a filter on it over the innerText property. Assume that a parent element of the div that we are querying has an id of container. You can normally access container directly from the id but let's do it the proper way.
var conty = document.getElementById("container"),
divs = conty.querySelectorAll("div"),
myDiv = [...divs].filter(e => e.innerText == "SomeText");
So that's it.
If you don't want to use jquery or something like that then you can try this:
function findByText(rootElement, text){
var filter = {
acceptNode: function(node){
// look for nodes that are text_nodes and include the following string.
if(node.nodeType === document.TEXT_NODE && node.nodeValue.includes(text)){
return NodeFilter.FILTER_ACCEPT;
return NodeFilter.FILTER_REJECT;
var nodes = [];
var walker = document.createTreeWalker(rootElement, NodeFilter.SHOW_TEXT, filter, false);
//give me the element containing the node
return nodes;
//call it like
var nodes = findByText(document.body,'SomeText');
//then do what you will with nodes[];
for(var i = 0; i < nodes.length; i++){
//do something with nodes[i]
Once you have the nodes in an array that contain the text you can do something with them. Like alert each one or print to console. One caveat is that this may not necessarily grab divs per se, this will grab the parent of the textnode that has the text you are looking for.
Google has this as a top result for For those who need to find a node with certain text.
By way of update, a nodelist is now iterable in modern browsers without having to convert it to an array.
The solution can use forEach like so.
var elList = document.querySelectorAll(".some .selector");
elList.forEach(function(el) {
if (el.innerHTML.indexOf("needle") !== -1) {
// Do what you like with el
// The needle is case sensitive
This worked for me to do a find/replace text inside a nodelist when a normal selector could not choose just one node so I had to filter each node one by one to check it for the needle.
Use XPath and document.evaluate(), and make sure to use text() and not . for the contains() argument, or else you will have the entire HTML, or outermost div element matched.
var headings = document.evaluate("//h1[contains(text(), 'Hello')]", document, null, XPathResult.ANY_TYPE, null );
or ignore leading and trailing whitespace
var headings = document.evaluate("//h1[contains(normalize-space(text()), 'Hello')]", document, null, XPathResult.ANY_TYPE, null );
or match all tag types (div, h1, p, etc.)
var headings = document.evaluate("//*[contains(text(), 'Hello')]", document, null, XPathResult.ANY_TYPE, null );
Then iterate
let thisHeading;
while(thisHeading = headings.iterateNext()){
// thisHeading contains matched node
Here's the XPath approach but with a minimum of XPath jargon.
Regular selection based on element attribute values (for comparison):
// for matching <element class="foo bar baz">...</element> by 'bar'
var things = document.querySelectorAll('[class*="bar"]');
for (var i = 0; i < things.length; i++) {
things[i].style.outline = '1px solid red';
XPath selection based on text within element.
// for matching <element>foo bar baz</element> by 'bar'
var things = document.evaluate('//*[contains(text(),"bar")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
for (var i = 0; i < things.snapshotLength; i++) {
things.snapshotItem(i).style.outline = '1px solid red';
And here's with case-insensitivity since text is more volatile:
// for matching <element>foo bar baz</element> by 'bar' case-insensitively
var things = document.evaluate('//*[contains(translate(text(),"ABCDEFGHIJKLMNOPQRSTUVWXYZ","abcdefghijklmnopqrstuvwxyz"),"bar")]',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,null);
for (var i = 0; i < things.snapshotLength; i++) {
things.snapshotItem(i).style.outline = '1px solid red';
There are lots of great solutions here already. However, to provide a more streamlined solution and one more in keeping with the idea of a querySelector behavior and syntax, I opted for a solution that extends Object with a couple prototype functions. Both of these functions use regular expressions for matching text, however, a string can be provided as a loose search parameter.
Simply implement the following functions:
// find all elements with inner text matching a given regular expression
// args:
// selector: string query selector to use for identifying elements on which we
// should check innerText
// regex: A regular expression for matching innerText; if a string is provided,
// a case-insensitive search is performed for any element containing the string.
Object.prototype.queryInnerTextAll = function(selector, regex) {
if (typeof(regex) === 'string') regex = new RegExp(regex, 'i');
const elements = [...this.querySelectorAll(selector)];
const rtn = elements.filter((e)=>{
return e.innerText.match(regex);
return rtn.length === 0 ? null : rtn
// find the first element with inner text matching a given regular expression
// args:
// selector: string query selector to use for identifying elements on which we
// should check innerText
// regex: A regular expression for matching innerText; if a string is provided,
// a case-insensitive search is performed for any element containing the string.
Object.prototype.queryInnerText = function(selector, text){
return this.queryInnerTextAll(selector, text)[0];
With these functions implemented, you can now make calls as follows:
document.queryInnerTextAll('', 'go');
This would find all divs containing the link class with the word go in the innerText (eg. Go Left or GO down or go right or It's Good)
document.queryInnerText('', 'go');
This would work exactly as the example above except it would return only the first matching element.
document.queryInnerTextAll('a', /^Next$/);
Find all links with the exact text Next (case-sensitive). This will exclude links that contain the word Next along with other text.
document.queryInnerText('a', /next/i);
Find the first link that contains the word next, regardless of case (eg. Next Page or Go to next)
e = document.querySelector('#page');
e.queryInnerText('button', /Continue/);
This performs a search within a container element for a button containing the text, Continue (case-sensitive). (eg. Continue or Continue to Next but not continue)
I had similar problem.
Function that return all element which include text from arg.
This works for me:
function getElementsByText(document, str, tag = '*') {
return [...document.querySelectorAll(tag)]
el => (el.text && el.text.includes(str))
|| (el.children.length === 0 && el.outerText && el.outerText.includes(str)))
Since there are no limits to the length of text in a data attribute, use data attributes! And then you can use regular css selectors to select your element(s) like the OP wants.
for (const element of document.querySelectorAll("*")) {
element.dataset.myInnerText = element.innerText;
document.querySelector("*[data-my-inner-text='Different text.']").style.color="blue";
<div>SomeText, text continues.</div>
<div>Different text.</div>
Ideally you do the data attribute setting part on document load and narrow down the querySelectorAll selector a bit for performance.
I was looking for a way to do something similar using a Regex, and decided to build something of my own that I wanted to share if others are looking for a similar solution.
function getElementsByTextContent(tag, regex) {
const results = Array.from(document.querySelectorAll(tag))
.reduce((acc, el) => {
if (el.textContent && el.textContent.match(regex) !== null) {
return acc;
}, []);
return results;

Search Engine with jQuery :contains() [duplicate]

Is there a case insensitive version of the :contains jQuery selector or should I do the work manually by looping over all elements and comparing their .text() to my string?
What I ended up doing for jQuery 1.2 is :
jQuery.expr[':'], {
Contains : "jQuery(a).text().toUpperCase().indexOf(m[3].toUpperCase())>=0"
This will extend jquery to have a :Contains selector that is case insensitive, the :contains selector remains unchanged.
Edit: For jQuery 1.3 (thanks #user95227) and later you need
jQuery.expr[':'].Contains = function(a,i,m){
return jQuery(a).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
Apparently accessing the DOM directly by using
(a.textContent || a.innerText || "")
instead of
In the previous expression speeds it up considerably so try at your own risk if speed is an issue. (see #John 's question)
Latest edit: For jQuery 1.8 it should be:
jQuery.expr[":"].Contains = jQuery.expr.createPseudo(function(arg) {
return function( elem ) {
return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
To make it optionally case insensitive:
$.extend($.expr[':'], {
'containsi': function(elem, i, match, array)
return (elem.textContent || elem.innerText || '').toLowerCase()
.indexOf((match[3] || "").toLowerCase()) >= 0;
then use :containsi instead of :contains
As of jQuery 1.3, this method is deprecated. To get this to work it needs to be defined as a function:
jQuery.expr[':'].Contains = function(a,i,m){
return jQuery(a).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
If someone (like me) is interested what do a and m[3] mean in Contains definition.
KEY/LEGEND: Params made available by jQuery for use in the selector definitions:
r = jQuery array of elements being scrutinised. (eg: r.length = Number of elements)
i = index of element currently under scrutiny, within array r.
a = element currently under scrutiny. Selector statement must return true to include it in its matched results.
m[2] = nodeName or * that we a looking for (left of colon).
m[3] = param passed into the :selector(param). Typically an index number, as in :nth-of-type(5), or a string, as in :color(blue).
In jQuery 1.8 you will need to use
jQuery.expr[":"].icontains = jQuery.expr.createPseudo(function (arg) {
return function (elem) {
return jQuery(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
A variation that seems to perform slightly faster and that also allows regular expressions is:
jQuery.extend (
jQuery.expr[':'].containsCI = function (a, i, m) {
//-- faster than jQuery(a).text()
var sText = (a.textContent || a.innerText || "");
var zRegExp = new RegExp (m[3], 'i');
return zRegExp.test (sText);
Not only is this case-insensitive, but it allows powerful searches like:
$("p:containsCI('\\bup\\b')") (Matches "Up" or "up", but not "upper", "wakeup", etc.)
$("p:containsCI('(?:Red|Blue) state')") (Matches "red state" or "blue state", but not "up state", etc.)
$("p:containsCI('^\\s*Stocks?')") (Matches "stock" or "stocks", but only at the start of the paragraph (ignoring any leading whitespace).)
May be late.... but,
I'd prefer to go this way..
$.extend($.expr[":"], {
"MyCaseInsensitiveContains": function(elem, i, match, array) {
return (elem.textContent || elem.innerText || "").toLowerCase().indexOf((match[3] || "").toLowerCase()) >= 0;
This way, you DO NOT tamper with jQuery's NATIVE '.contains'... You may need the default one later...if tampered with, you might find yourself back to stackOverFlow...
jQuery.expr[':'].contains = function(a,i,m){
return jQuery(a).text().toUpperCase().indexOf(m[3].toUpperCase())>=0;
The update code works great in 1.3, but "contains" should be lower case on the first letter unlike the previous example.
Refer below to use ":contains" to find text ignoring its case sensitivity from an HTML code,
$.expr[":"].contains = $.expr.createPseudo(function(arg) {
return function( elem ) {
return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
$("#searchTextBox").keypress(function() {
if($("#searchTextBox").val().length > 0){
var userSerarchField = $("#searchTextBox").val();
$(".rows:contains('"+ userSerarchField +"')").css("display","block");
} else {
You can also use this link to find case ignoring code based on your jquery version,
Make jQuery :contains Case-Insensitive
A faster version using regular expressions.
$.expr[':'].icontains = function(el, i, m) { // checks for substring (case insensitive)
var search = m[3];
if (!search) return false;
var pattern = new RegExp(search, 'i');
return pattern.test($(el).text());
I had a similar problem with the following not working...
// This doesn't catch flac or Flac
$('div.story span.Quality:not(:contains("FLAC"))').css("background-color", 'yellow');
This works and without the need for an extension
$('div.story span.Quality:not([data*="flac"])').css("background-color", 'yellow');
This works too, but probably falls into the "manually looping" category....
$('div.story span.Quality').contents().filter(function()
return !/flac/i.test(this.nodeValue);
}).parent().css("background-color", 'yellow');
New a variable I give it name subString and put string you want to search in some elements text. Then using Jquery selector select elements you need like my example $("elementsYouNeed") and filter by .filter(). In the .filter() it will compare each elements in $("elementsYouNeed") with the function.
In the function i using .toLowerCase() for element text also subString that can avoid case sensitive condition and check if there is a subString in it. After that the .filter() method constructs a new jQuery object from a subset of the matching elements.
Now you can get the match elements in matchObjects and do whatever you want.
var subString ="string you want to match".toLowerCase();
var matchObjects = $("elementsYouNeed").filter(function () {return $(this).text().toLowerCase().indexOf(subString) > -1;});

Check if any tags have a certain inner HTML

How would i write a jquery function that returns true if any spans within a div with id 'word' have an inner HTML of value v? For the selector, I have:
$('#word span').html()
I'm confused as to the correct way to iterate through them, and return a boolean value because currently i have 5 span tags within that div.
You could use :contains as in $("#word span:contains(v)"), but that selects spans that contain 'v' rather than have it as an exact value. .html only returns the html string of the first element selected, so you probably want to iterate with .each and do an exact comparison:
var count = 0;
$("#word span").each(function () {
if ($.trim($(this).text()) === 'v') {
You can use filter method:
$("#word span").filter(function () {
return this.innerHTML === v; // in case that v is a variable
// return $(this).text() === 'v';
The contains selector
Since you are alread using jQuery, you can take advantage of its .contains method or the ':contains' pseudo-selector:
$("#word span").contains("word")
$("#word span:contains(word)")
This would not return true for each span that contains the word, but rather the elements that contain that word. You would be left with a list of matched elements, that can be manipulated like so:
var $matched = $("word span").contains("word");
$matched.each(function (i, el) {
// do something with the el

If a Div or it's children contain a specific string/substring?

In JQuery/JavaScript, how can I find out if a Div contains a specific string/substring in one of it's child elements? I've looked into both contains and indexOf but couldn't find any examples of my specific case where I need to commit a different action if a unique string/substring of that string is found.
Pseudo Code:
if (div contains (itself or child nodes) "this string/part of this string")
then do something
then do something else
You can use text() of div to get all the text of the current div and its childs,
if('#divId').text().indexOf("this string/part of this string") != -1)
How about this:
$('#yourDiv:contains("search text")').length > 0
Alternatively you could do this:
$('#yourDiv').text().indexOf("search text") !== -1
Both the contains selector and indexOf function are case sensitive so if that matters try:
var re = new RegExp( "regex", "i");
if( re.test( $("#div").text() ) ) // returns boolean

How to filter elements returned by QuerySelectorAll

I'm working on a javascript library, and I use this function to match elements:
$ = function (a)
var x;
if (typeof a !== "string" || typeof a === "undefined"){ return a;}
//Pick the quickest method for each kind of selector
return document.getElementById(a.split('#')[1]);
else if(a.match(/^([\w\-]+)$/))
x = document.getElementsByTagName(a);
x = document.querySelectorAll(a);
//Return the single object if applicable
return (x.length === 1) ? x[0] : x;
There are occasions where I would want to filter the result of this function, like pick out a div span, or a #id div or some other fairly simple selector.
How can I filter these results? Can I create a document fragment, and use the querySelectorAll method on that fragment, or do I have to resort to manual string manipulation?
I only care about modern browsers and IE8+.
If you want to look at the rest of my library, it's here:
To clarify, I want to be able to do something like $_(selector).children(other_selector) and return the children elements matching that selector.
So here's my potential solution to the simplest selectors:
tag_reg = /^([\w\-]+)$/;
id_reg = /#([\w\-]+$)/;
class_reg = /\.([\w\-]+)$/;
function _sel_filter(filter, curr_sel)
var i,
len = curr_sel.length,
matches = [];
if(typeof filter !== "string")
return filter;
//Filter by tag
if(curr_sell[i].tagName.toLowerCase() == filter.toLowerCase())
else if(filter.match(class_reg))
else if(filter.match(id_reg))
return document.getElementById(filter);
console.log(filter+" is not a valid filter");
return (matches.length === 1) ? matches[0] : matches;
It takes a tag like div, an id, or a class selector, and returns the matching elements with the curr_sel argument.
I don't want to have to resort to a full selector engine, so is there a better way?
I don't think I get the question right. Why would you want to "filter" the result of querySelectorAll() which infact, is some kind of a filter itself. If you query for div span or even better #id div, those results are already filtered, no ?
However, you can apply Array.prototype.filter to the static result of querySelectorAll like follows:
var filter = Array.prototype.filter,
result = document.querySelectorAll('div'),
filtered = result, function( node ) {
return !!node.querySelectorAll('span').length;
That code would first use querySelectorAll() to query for all <div> nodes within the document. Afterwards it'll filter for <div> nodes which contain at least one <span>. That code doesn't make much sense and is just for demonstrative purposes (just in case some SO member wants to create a donk comment)
You can also filter with Element.compareDocumentPosition. I'll also tell if Elements are disconnected, following, preceding, or contained. See MDC .compareDocumentPosition()
Note: NodeList is not a genuine array, that is to say it doesn't have
the array methods like slice, some, map etc. To convert it into an
array, try Array.from(nodeList).
for example:
let highlightedItems = Array.from(userList.querySelectorAll(".highlighted"));
highlightedItems.filter((item) => {
Most concise way in 2019 is with spread syntax ... plus an array literal [...], which work great with iterable objects like the NodeList returned by querySelectorAll:
[...document.querySelectorAll(".myClass")].filter(el=>{/*your code here*/})
Some browsers that support qsa also support a non-standard matchesSelector method, like:
...that will return a boolean representing whether element matched the selector provided. So you could iterate the collection, and apply that method, retaining positive results.
In browsers that don't have a matchesSelector, you'd probably need to build your own selector based method similar to the selector engine you're building.