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Jquery if string contains

= 4.0.0. Mozilla Developer Network compatibility table If you need to support Internet Explorer, you must instead use the String # Indexof () method, which has been part of JavaScript from ES1 in 1997. CONST STR = 'ARYA STARK'; STR.INDEXOF ('STARK')! == -1; STR.INDEXOF ('SNOW')! == -1; In general, if you have any doubts about the fact that the code will be performed in an environment that supports includes (), you need to use indexof (). The syntax of the function includes () is only marginally more concise indexing (). Insensitive cases seeks both string # includes () and String # indexof () are case sensitive. N? ? function supports regular expressions. To make the insensitive search, you can use regular expressions and the String # Match () function or it is possible to convert both the string and the substructure to the tiny using the String # Tolowercase () function. CONST STR = 'ARYA STARK'; STR.MATCH (/ STARK / I); Str.Match (/ Nevica (s); str.tolowercase (). Includes ('Stark'tolowerase ()); str.tolowercase (). Indexif ('stark'.tolowerase ())! == -1; str.tolowercase (). Includes ('Snow'Tolowerasesesa ()); str.tolowercase (). INDICEF ('SNOW'.TOLERASESESE ())! == -1; More Fundamental Tutorials Newbedevpythonjavscriptlinxcheat Sheet I have a shopping cart that displays the product options in a drop-down menu and if you select "Yes", I want to make other fields on the visible page. The problem is that the shopping cart also includes the price modifier in the text, which can be different for each product. The following code works: $ (document) .ready (function () {$ ('Select [ID = "Engraving"]'). Change (function () {VAR STR = $ ('Select [ID = "Engraving"] Option: selected '). text (); if (str == "S? (+ $ 6.95)") {$ ('. Engraving '). Show ();} Else {$ ('. Engraving '). Hide ();}});}); However I would prefer to use something like that, which does not work: $ (document) .ready (function () {$ ('select [id = "incision"]'). Change (function () {var str = $ ('select [ Id = "engraving"] option: selected '). Text (); if (str * = "yes") {$ (' incision '). Show ();} else {$ ('. Engraving ') .nasize ();}});}); I just want to perform the action if the selected option contains the word "yes" and would ignore the price modifier. The URL bar or the address bar of a web browser contains the address of a website. The URL also contains parameters or arguments, which we often define dynamically to communicate with elements or objects on a web page. Sometimes we need to extract the data we move on to URL as parameters. Here you show you how to check if the URL bar contains a series or text or a specified value or value using JavaScript indexof (). You will need this if Working on a website that depends on the data extracted from URL. You can extract or read the URL parameters on the server side in (for example using querystring) and using the JavaScript methods to the client side itself. See this demo is that you are using jquery or javascript for your frontend, you can simply use the indexof () method with the href property using windows.location windows.location Syntax for indexof () string.indexof (searchValue) The indexof () method returns the position (a number) of the first occurrence of a certain string. You will return -1, if you find anything that matches the date string. You can use the indexof () method with the HREF properties of the Windows.Location object. For example, var t = window.location.href.indexof ('& book ='); If the method finds the string & book = in the URL, return the position (a number) and the position to the T variable. Note: The character & indicates that I am passing a parameter more for the URL. Now, let's see an example. I would like to check if the URL contains the parameter? Book = in jQuery. My script would be a | The script if (window.location.href.indexof ()> 0 'book =?') {} Herea S a complete markup with the script to check using jQuery.

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