What is the best way to connect a string to a scoped variable in a view?

Question

What is the best way to connect a string to a scoped variable in a view?

I'm looking to connect a string to a scope variable that will be determined by user input in an input field located within a specific view. The goal is for the combined string and scope variable value to appear in another div within the view.

Here's an example of what I have in mind:

<body ng-controller="MainCtrl">
Name: <input ng-model="userInput" placeholder="Type your input here..."/><br>
<div>{{ "Hello" + userInput}}</div>

However, the issue arises when the word "Hello" is displayed before any user input has been entered. I'd like it to show up only after the user has inputted their desired text.

javascript angularjs ionic-framework ngcordova ionic-view

Answer 1

Answer №1

There are several different methods that can be used, such as implementing the `ng-if` directive or utilizing a ternary expression.

<div ng-if="userInput">{{ "Hello" + userInput}}</div>

Alternatively,

<div>{{userInput ?  "Hello" + userInput :''}}</div>

Answer 2

There are several different methods that can be used, such as implementing the `ng-if` directive or utilizing a ternary expression.

<div ng-if="userInput">{{ "Hello" + userInput}}</div>

Alternatively,

<div>{{userInput ?  "Hello" + userInput :''}}</div>

Answer 3

Answer №2

Give this a go:

Name: <input ng-model="userInput" placeholder="Type something here..."/><br>
<div ng-show="!!userInput">{{ "Hey there" + userInput}}</div>

Answer 4

Give this a go:

Name: <input ng-model="userInput" placeholder="Type something here..."/><br>
<div ng-show="!!userInput">{{ "Hey there" + userInput}}</div>

Answer 5

Answer №3

To create your custom filter named ifEmpty, follow the example below:

angular.module('app').filter('ifEmpty', function() {
    return function(input, defaultValue) {
        if (angular.isUndefined(input) || input === null || input === '') {
            return defaultValue;
        }

        return "Greetings "+input;
    }
});

After creating the filter, you can use it like this:

<div>{{ userInput | ifEmpty:''}}</div>

Answer 6

To create your custom filter named ifEmpty, follow the example below:

angular.module('app').filter('ifEmpty', function() {
    return function(input, defaultValue) {
        if (angular.isUndefined(input) || input === null || input === '') {
            return defaultValue;
        }

        return "Greetings "+input;
    }
});

After creating the filter, you can use it like this:

<div>{{ userInput | ifEmpty:''}}</div>

Answer 7

Answer №4

To show the user input, you can utilize an ng-if.

<p ng-if="userInput">Greetings {{userInput}}</p>

Answer 8

To show the user input, you can utilize an ng-if.

<p ng-if="userInput">Greetings {{userInput}}</p>

What is the best way to connect a string to a scoped variable in a view?

Answer №1

Answer №2

Answer №3

Answer №4

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