Using VueJs to associate boolean values with dropdowns

Question

Using VueJs to associate boolean values with dropdowns

I am currently working on a form with a dropdown menu containing two options: "True" and "False". My goal is to save the selected value as a boolean in the form.

For instance, when the user selects "True", I want the value stored as true in boolean format.

<select v-model="selected">
  <option :value="null">Pick a value</option>
  <option v-for="val in options">{{val}}</option>
</select>

...

data() {
 return {
  selected: null,
   options: ["true", "false"]
}

If you'd like to see what I'm working on, here's a fiddle link: https://jsfiddle.net/q0nk9h32/5/

Do you have any suggestions on how I can display the selected values in their boolean form?

As a bonus question: Instead of using the options variable, would it be considered valid syntax or good practice to use:

v-for="val in ["true", "false"]" ?

I feel like having a separate variable for this might be unnecessary (but when I tried using an array directly, it failed in the fiddle). Appreciate any insights!

javascript vue.js

Answer 1

Answer №1

To assign a value to each <option>, you can use the :value attribute.

Click here for more information on Select Options in Vue.js

new Vue({
    el: '#app',
    data() {
        return {
            selected: null
        }
    }
});

<script src="https://unpkg.com/vue"></script>

<div id="app">
    <select v-model="selected">
        <option :value="null">Pick a value</option>
        <option v-for="val in [true, false]" :value="val">{{val}}!!!</option>
    </select>
    <p>
        Selected is the {{ typeof selected }}: {{ selected }}
    </p>
</div>

If you want, you can define the array directly within the v-for. Keep in mind that when using double quotes around strings, it may conflict with existing double quotes in attributes.

There are multiple ways to display the text as True and False for these values...

In particular cases where there are only two values, such as true and false, you might consider skipping the v-for loop and manually writing the options.

<option :value="null">Pick a value</option>
<option :value="true">True</option>
<option :value="false">False</option>

Alternatively, you could utilize a filter or method to format the text accordingly. Here are examples:

<option v-for="val in [true, false]" :value="val">{{ val | filter }}</option>

or

<option v-for="val in [true, false]" :value="val">{{ method(val) }}</option>

To implement a filter, define it in the component's filters section. For a method, place it in the methods. The function should convert the boolean value to a string and capitalize the first letter.

// This method could be named differently...
method (value) {
    const str = String(value);
    return str.charAt(0).toUpperCase() + str.slice(1);
}

Considering there are only two options, several other approaches can achieve the same result. For instance:

<option v-for="val in [true, false]" :value="val">{{ val ? 'True' : 'False' }}</option>

Answer 2

To assign a value to each <option>, you can use the :value attribute.

Click here for more information on Select Options in Vue.js

new Vue({
    el: '#app',
    data() {
        return {
            selected: null
        }
    }
});

<script src="https://unpkg.com/vue"></script>

<div id="app">
    <select v-model="selected">
        <option :value="null">Pick a value</option>
        <option v-for="val in [true, false]" :value="val">{{val}}!!!</option>
    </select>
    <p>
        Selected is the {{ typeof selected }}: {{ selected }}
    </p>
</div>

If you want, you can define the array directly within the v-for. Keep in mind that when using double quotes around strings, it may conflict with existing double quotes in attributes.

There are multiple ways to display the text as True and False for these values...

In particular cases where there are only two values, such as true and false, you might consider skipping the v-for loop and manually writing the options.

<option :value="null">Pick a value</option>
<option :value="true">True</option>
<option :value="false">False</option>

Alternatively, you could utilize a filter or method to format the text accordingly. Here are examples:

<option v-for="val in [true, false]" :value="val">{{ val | filter }}</option>

or

<option v-for="val in [true, false]" :value="val">{{ method(val) }}</option>

To implement a filter, define it in the component's filters section. For a method, place it in the methods. The function should convert the boolean value to a string and capitalize the first letter.

// This method could be named differently...
method (value) {
    const str = String(value);
    return str.charAt(0).toUpperCase() + str.slice(1);
}

Considering there are only two options, several other approaches can achieve the same result. For instance:

<option v-for="val in [true, false]" :value="val">{{ val ? 'True' : 'False' }}</option>

Answer 3

Answer №2

An alternative approach could involve implementing a computed property that simply evaluates whether this.selected is equal to 'true'.

Answer 4

An alternative approach could involve implementing a computed property that simply evaluates whether this.selected is equal to 'true'.

Using VueJs to associate boolean values with dropdowns

Answer №1

Answer №2

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