only when the input field was touched and is still invalid. Now the error is showed on the loaded fresh new form. How to do it? following:touched and valid using reactive forms in Angular I tried using form control like: <div class="form__control"> <label for="title"...
Validation: exportfunctionatLeastOne(validator: ValidatorFn, controls: string[] = []):ValidatorFn{return(control:AbstractControl):ValidationErrors|null=>{if(!control)returnnull;constformGroup = controlasFormGroup;return(formGroup && controls.some(k=>!validator(formGroup.controls[k]))) ...
<!DOCTYPEhtml><html><body>Only numbers not startingwithzero allowed.<br><input type="text"...
可以根据具体需求自定义验证指令来验证textbox和textarea。例如,自定义一个指令来验证textbox只允许输入数字:app.directive('onlyNumbers', function() { return { require: 'ngModel', link: function(scope, element, attrs, ngModelCtrl) { ngModelCtrl.$parsers.push(function(inputValue) { var transfor...
digits:nEnsures that field only has integer numbers and length precisely matches the specified length (n). digits_between:min,maxEnsures that field only has integer numbers and is between a min,max length. emailChecks for a valid email address ...
Dropdown with Typeahead Support In the next section, let's enable the input of multiple phone numbers. 动态表单数组 注意,phones是一个数组,可能允许许多输入。我们可以通过构建一个带有this.formBuilder.array和几个辅助函数的FormArray来实现这一点: src/app/user/profile/profile.component.ts ... phones...
Again if we want the numbers only divisible by 3, again we have to copy paste entire code just by changing the if condition. If we have a chance to pass the if condition as a argument to method, then we would have achieved both requirements with only one method, for this java 8 ...
Angular Strongly typed forms in Angular Registering form groups in Angular Form control validation Making a custom form control Nesting form groups in Angular Adding asynchronous data to the form How to add a FormControl to a FormGroup How to set a FormGroup value What is FormBuilder in ...
Syntaxe de la validation des e-mails dans AngularJS : <formname="Form">Code:<inputtype="text"name="pincode"ng-model="txtpin"ng-pattern="/^[0-9]{1,5}$/"/><spanng-show="personForm.pincode.$error.pattern">Only numbers allowed</span></form> ...
public numbers: Observable<Array<any>>; ngOnInit() { this.numbers = Observable.interval(1000 * 2).map( i => { return new Array(5).fill(0).map(i => { return Math.random(); }); }); } 示例中并没有编写任何subscribe来订阅结果,而只是在模块中添加了asyncPipe。这样的好处是代码量减少...