In a modern SPFx Web Part, how do I check if a URL exists?
121066
How to check if list item already exist when adding it with
47715
How to check if the URL contains a given string?
19821
Navigating to the edit mode of a not-exist page produces a strange error message
79280
SPSite.Exists returning true for a just deleted site collection
40136
WPF WebBrowser - detecting redirects?
22311
How to validate that an object (whose locator we don't know since it is not present) is not present in a page
50579
How to find out if a file exists in C# / .NET?
133303
How to navigate in JSF? How to make URL reflect current page (and not previous one)
145789
Detect if the url in an iFrame has changed
147951
How can you get the "real" HttpContext within an ASP.NET MVC application?
31916
How can I get a FlowDocument Hyperlink to launch browser and go to URL in a WPF app?
17824
How to detect the presence of URL in a string
2940
How to add http:// if it doesn't exist in the URL
89636
How to get the valid URL of a Link field from within a Twig template?
135480
How do I get the current location of an iframe?
144136
jQuery: Check if image exists
11663
Checking a list if a certain string exist in visualforce page