I am doing some processing on these results and I need to check if the results(i.e the urls are valid for eg that the website is still there etc). Do you know of any thing which I can use in javascript to do so. 10x Sort by date Sort by votes May 14, 2009 #2 feherke ...
String url = sc.next(); if(isUrlValid(url)) { URL obj = new URL(url); //Opening a connection HttpURLConnection conn = (HttpURLConnection) obj.openConnection(); //Sending the request conn.setRequestMethod("GET"); int response = conn.getResponseCode(); if (response == 200) { //...
Check if DateTime is valid Check if dateTimePicker value is before today check if files exist in directory and subdirectories Check if folder has subfolders (fastest) Check if form is closed Check if input string matches a specific format Check if Last Character of a String Is A Number check...
let a = null; console.log(_.isNull(a)); // true console.log(_.isUndefined(a)); // false console.log(_.isNil(a)); // true Conclusion In this short guide, we've taken a look at how to check if a variable is null, undefined or nil in JavaScript, using the ==, === and...
JavaScript Code: // Define a JavaScript function called is_weekend with parameter date1varis_weekend=function(date1){// Create a new Date object by parsing the provided date stringvardt=newDate(date1);// Check if the day of the week is Saturday (6) or Sunday (0)if(dt.getDay()==6|...
JavaScript Code:// Define a function 'isValidJSON' that checks if a given string 'obj' is a valid JSON const isValidJSON = obj => { // Try to parse the string as JSON try { JSON.parse(obj); // If parsing succeeds, return true return true; } catch (e) { // If parsing ...
When it comes to small applications that don't require external dependencies - checking whether an object is empty is best done with pure JavaScript. However, if your application already has external libraries such aslodashandunderscore- they offer great ways to perform these checks as well. ...
// Check if an element is visible on the screen (e.g. not display: none) var isInvisible = $('selector').is(':visible'); // Check if an element is a hidden element var isHidden = $('selector').is(':hidden'); If this isn't what you are looking for, would it be possib...
在使用UIAbilityContext时报401“The context must be a valid Context”的Context类型错误 应用、元服务和卡片是什么关系 系统应用、三方应用、预置应用有什么差别 如何设置默认语言和应用名称为中文 如何查询应用进程的pid信息 除应用市场外,是否存在其它途径下载安装应用包 app.json5文件与工程级build-profile...
Here we missed if the value of 'a' is null: constobj = {a:null}constexisting =typeofget(obj,'a') !== undefined//false, because typeof null === 'object' To solve the problem we can actully using get(obj,'a')!=null//double equals null checks both null and undefined cases...