in component: formData.form.controls[’email’].setErrors({‘incorrect’: true}); and in HTML: <input mdInput placeholder=”Email” type=”email” name=”email” required [(ngModel)]=”email” #email=”ngModel”> <div *ngIf=”!email.valid”>{{email.errors| json}}</div>
To check whether a certain field is valid, use: $(‘#myField’)[0].checkValidity(); // returns true|false To check if the form is valid, use: $(‘#myForm’)[0].checkValidity(); // returns true|false If you want to display the native error messages that some browsers have (such as Chrome), unfortunately the only way to do that is by submitting the form, like this: … Read more
The best you can achieve with HTML only (documentation): <input type=”number” min=”0″ step=”1″/>
Yes, you can use the File API for this. Here’s a complete example (see comments): document.getElementById(“btnLoad”).addEventListener(“click”, function showFileSize() { // (Can’t use `typeof FileReader === “function”` because apparently it // comes back as “object” on some browsers. So just see if it’s there // at all.) if (!window.FileReader) { // This is VERY unlikely, browser … Read more
Try this to validate HTTP URLs (uriName is the URI you want to test): Uri uriResult; bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult) && uriResult.Scheme == Uri.UriSchemeHttp; Or, if you want to accept both HTTP and HTTPS URLs as valid (per J0e3gan’s comment): Uri uriResult; bool result = Uri.TryCreate(uriName, UriKind.Absolute, out uriResult) && (uriResult.Scheme == … Read more
I actually like MY JavaScript files to be validated, but I definitely don’t want to validate and deal with trivial warnings with third party libraries. That’s why I think that turning off validation all together is too drastic. Fortunately with Eclipse, you can selectively remove some JavaScript sources from validation. Right-click your project. Navigate to: … Read more
Currently, UUID’s are as specified in RFC4122. An often neglected edge case is the NIL UUID, noted here. The following regex takes this into account and will return a match for a NIL UUID. See below for a UUID which only accepts non-NIL UUIDs. Both of these solutions are for versions 1 to 5 (see … Read more
You can use regular old javascript for that: function isEmail(email) { var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/; return regex.test(email); }
I would use NSPredicate: func isValidEmail(_ email: String) -> Bool { let emailRegEx = “[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}” let emailPred = NSPredicate(format:”SELF MATCHES %@”, emailRegEx) return emailPred.evaluate(with: email) } for versions of Swift earlier than 3.0: func isValidEmail(email: String) -> Bool { let emailRegEx = “[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}” let emailPred = NSPredicate(format:”SELF MATCHES %@”, emailRegEx) return emailPred.evaluate(with: email) } for … Read more
Here is the code to handle custom error message in HTML5: <input type=”text” id=”username” required placeholder=”Enter Name” oninvalid=”this.setCustomValidity(‘Enter User Name Here’)” oninput=”this.setCustomValidity(”)”/> This part is important because it hides the error message when the user inputs new data: oninput=”this.setCustomValidity(”)”