Approach 1: We will use the onchange event in the input element and call a function to see the effect. switch (_string) {. function check_empty(_string) {. reac-router-dom push search params object. Javascript check if string is empty using case statement. If the url does not contains a hash, then an empty string "" will be returned. case "": case null: case false: The function takes params and url as a parameters. is there any way to detect this change from Component partial . Then we call text.replace with the urlRegex and return a string with the matched url in the callback. Start typing in the box below and you'll see the query string in your browser's URL bar . Set a query string value before calling the start method (with the generated proxy) $.connection.hub.qs = { 'version' : '1.0' }; Set a query string value before calling the start method (without the generated proxy) To attach an event handler to the change event of an element, you can either call the addEventListener () method: element.addEventListener ( 'change', function() { // handle change }); Code language: JavaScript (javascript) or use the onchange attribute of the element. The URL change occurs when variants are selected with the query parameter (question mark) like this: The Regex Pattern checks the value that starts with either & or ? Therefore, when we call urlify with text , we get: Be sure to change the url variable to your page's URL! If we trigger the animation when a media query changes (rather than on node insertion), we can also detect when that media query change happened in our JavaScript. Plain Javascript code to get query parameters. While URLSearchParams is ideal, not all browsers support that API. The following examples show how to set a query string parameter in client code. The g flag at the end of the regex lets us search for all URLs in the string. react router push query params. history push with query params. Putting together media queries and animations. react add query parameter to url. change query string connected-router. There's a polyfill available but if you want a tiny function for basic query string parsing, the following is a function stolen from the A-Frame VR toolkit which parses the query string to get the key's value you'd like: To detect a screen orientation change in Javascript you can use the following snippet. Media queries are used to determine the width and height of a viewport to make web pages look good on all devices (desktops, laptops, tablets, phones, etc). The change event occurs when the element has completed changing. Approach 2: There are few other events that can be used to detect the change in content of textbox. For say, I have the following URL for the product page: https://localhost:44389/products If it is changed to https://localhost:44389 . Getting the URL Hash. To access the value of the query inside the browser, using JavaScript, we have a special API called URLSearchParam, supported by all modern browsers. 4 comments . body { animation-duration: 0.001s; } @media screen and (min-width: 1000px) { body { animation . Perhaps you can see where this is going. Here you assign the url to variable href inside the function. after page load add query param react. Here is how we can use it: const params = new URLSearchParams(window.location.search) Note: don't pass the full URL as a parameter to URLSearchParams (), but only the query string part of the . For example: Javascript get query string values. and click outside of it to see. This returned MediaQueryList can then be used to determine if the Document matches the media query, or to monitor a document to detect when it matches or stops matching the media query. Within the Browser, the window.matchMedia method returns a new MediaQueryList object representing the parsed results of the specified media query string. Sample Javascript function updateqs (param,value) { var url = '/code/get-query-strings-with-javascript'; var new_url = url + '?' + param + '=' + value; history.pushState (null, null, new_url); } Here's an example. Here is a utility function which is custom code that returns query key and value pairs in a javascript object. Sample Javascript window.addEventListener("orientationchange", function() { //0 = potrait //90 or -90 = landscape left or landscape right }, false); some devices do not fire the orientationchange event, try the resize event instead. The window.matchMedia () method returns a MediaQueryList object representing the results of the specified CSS media query string. Some of the solutions posted here are inefficient. Repeating the regular expression search every time the script needs to access a parameter is completely unnecessary, one single function to split up the parameters into an associative-array style object is enough. Use any or all of them onchange event, onpropertychange . append a query string to the url react without pushing. The hash of a url can be found by creating a new URL Javascript object from the URL string, and then using its hash property to get the value of the hash fragment. In the below example, the function will check different cases and print String is empty/null/undefined/ if the input argument is empty, null, undefined, false, or 0 else will print String input is valid. There are two approaches that are discussed below. The value of the matchMedia () method can be any of the . 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