"AngularJS offers a unique way to include alternative text in placeholders and titles using

I need to implement an input field (<input..>) with a placeholder and title for tooltip that functions in the following way:

There is a variable called "myString" which can either be undefined/empty or contain a string. When empty, a default string should be displayed as the placeholder; otherwise, the value of "myString" should be shown.

I am working with AngularJS but I'm finding that ng-if does not offer an ideal solution (basically duplicating the same HTML and showing one based on the value of myString).

Appreciate any advice!

javascriptangularjs

Answer №1

<input ng-model="modelName" placeholder="{{placeHolderString}}">

$scope.myString = "";
$scope.placeHolderString = $scope.myString ? $scope.myString : defaultString;

If the value of myString changes frequently, you may need to set up a watch on that variable like so:

$scope.$watch('myString', function (newVal, oldVal) {
    // Update placeHolderString based on the new value
});

Answer №2

If the variable myString is considered falsy (meaning it is undefined or empty), you have the option to use the logical OR operator (||) to display a default string as the placeholder:

<input placeholder="{{ myString || 'Placeholder text' }}">

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