我想限制用户创建一个新的文本框并回显错误消息，如果他/她在上一个文本字段中输入相同的值。因此，仅当文本字段具有不同的值时，才创建新文本框。
.HTML
<input type="text" ng-model="set.values"/>
<span ng-show="message"> Please enter a different value </span>
ANGULARJS
$scope.set = { values: [] };
$scope.message = false;
$scope.add = function (){
$scope.message = false;
$scope.set.values.push('');
}
您可以使用indexOf和$watch。观察ng-model值的变化，并检查该值是否已存在于数组中，如果是，则抛出错误。
.HTML
<input type="text" ng-model="set.val"/>
<span ng-show="message"> Please enter a different value </span>
.JS
$scope.set = {
values: []
}; //array that contains previous ng-model values
$scope.message = false;
$scope.$watch('set.val', function(val) {
if (val != undefined) var index = $scope.set.values.indexOf(val);
if (index > -1) $scope.message = true;
else {
$scope.message = false;
$scope.set.values.push(val);
//add new input logic
}
})
更新
如果您希望在单击添加按钮后进行检查(我假设该按钮存在于您的 UI 中(
$scope.set = {
values: [] //array that contains previous ng-model values
};
$scope.add = function() {
var index = $scope.set.values.indexOf($scope.set.val);
if (index > -1) $scope.message = true;
else {
$scope.message = false;
$scope.set.values.push($scope.set.val);
//add new input logic
}
}
如果您希望限制用户创建新的文本框并在他/她在上一个文本字段中输入相同值时回显错误消息，请参阅此内容。
var app = angular.module("app", []).controller("ctrl", function($scope) {
$scope.boxes = [{value: ""}];
$scope.message = false;
$scope.add = function(val) {
$scope.message = false;
//If total boxes are just one, no need to check, just set the value a nd insert a new box
if ($scope.boxes.length == 1) {
$scope.boxes[0].value = val;
$scope.boxes.push({value: ""});
}
//Total boxes are greater than 1, check last entered value and then add box
else {
$scope.checkAndAddBox(val);
}
}
$scope.checkAndAddBox = function(val) {
// $scope.boxes.length - 2 will give the last box from which value has to be checked
var lastBoxValue = $scope.boxes[$scope.boxes.length - 2].value;
//check this value with the new input box value
if (val != lastBoxValue) {
//set the box to this value
$scope.boxes[$scope.boxes.length - 1].value = val;
//insert a new one
$scope.boxes.push({value: ""});
}
//box has the same value, show error message
else {
$scope.message = true;
}
}
})<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<body ng-app="app" ng-controller="ctrl">
<div ng-repeat="box in boxes track by $index">
<input type="text" ng-model="box.value" ng-readonly="$last ? false : true" />
<button ng-if="$last" ng-click="add(box.value)">Add</button>
</div>
<span ng-show="message"> Please enter a different value </span>
</body>JS CODE :
var akashApp = angular.module('akashApp',[]);
function AvoidDuplicateEntries($scope){
$scope.books = [
{bookname: 'Learn Angular'},
{bookname: 'JS Tutorial'},
{bookname: 'Node Basics'}
];
var someBook = $scope.books;
$scope.addBook = function (){
var newBook = $scope.bookname;
var oldbooks;
if(newBook){ // avoiding empty data
angular.forEach($scope.books, function(eachbook){ //For loop
if(newBook.toLowerCase() == eachbook.bookname.toLowerCase()){ // this is for checking whether the data is existing or not
oldmovies = true;
}
});
if(!oldbooks){
someBook.push({bookname:newBook});
}
}
}
}
You can try this also.
HTML CODE :
<div style="padding:20px" ng-app="akashApp" id="ng-app" ng-controller="AvoidDuplicateEntries">
<h1>Basics using AngularJS</h1>
<table class="table table-bordered" style="width:220px;">
<thead>
<tr><td>#</td>
<td>Book Name</td></tr>
</thead>
<tr ng-repeat='Book in Racks'>
<td>{{$index+1}}</td>
<td>{{book.bookname}}</td>
</tr>
</table>
<form ng-submit="addBook();">
<input type="text" ng-model="bookname" size="30" placeholder="Which book you want to read" /><br />
<input type="submit" class="btn btn-primary" value="Add Book">
</form>
</div>