Category: Vue 3

Vue 3 is the latest version of the easy to use Vue JavaScript framework that lets us create front end apps.

In this article, we’ll look at how to create a landing page with Vue 3 and JavaScript.

Create the Project

We can create the Vue project with Vue CLI.

To install it, we run:

npm install -g @vue/cli

with NPM or:

yarn global add @vue/cli

with Yarn.

Then we run:

vue create landing-page

and select all the default options to create the project.

Create the Landing Page

To create the landing page, we write:

<template>
  <form v-if="!submitted" @submit.prevent="submitted = true">
    <div>
      <label>your name</label>
      <input v-model.trim="name" />
    </div>
    <button type="submit">submit</button>
  </form>
  <div v-else>
    <p>Welcome {{ name }}</p>
    <p>The time is {{ dateTime }}</p>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      name: "",
      dateTime: new Date(),
      timer: undefined,
      submitted: false,
    };
  },
  methods: {
    setDate() {
      this.dateTime = new Date();
    },
  },
  mounted() {
    this.timer = setInterval(() => {
      this.setDate();
    }, 1000);
  },
  beforeUnmount() {
    clearInterval(this.timer);
  },
};
</script>

We have a form that lets the user submit their name.

Inside it, we have an input that binds to the name reactive property with v-model .

The trim modifier lets us trim leading and trailing whitespaces.

The form has the v-if directive to show the form if submitted is false .

And triggering the submit event with the submit button with set submitted to true .

Below that, we should the landing page content by showing the name and dateTime .

In the script tag, we have the data method to return our reactive properties.

The setDate method sets the dateTime to the current date.

The mounted hook calls setInterval to call setDate to update dateTime every second.

The beforeUnmount hook calls clearInterval to clear the timer when we unmount the component.

Conclusion

We can create a landing page with Vue 3 and JavaScript.

Vue 3 is the latest version of the easy to use Vue JavaScript framework that lets us create front end apps.

In this article, we’ll look at how to create a drag and drop app with Vue 3 and JavaScript.

Create the Project

We can create the Vue project with Vue CLI.

To install it, we run:

npm install -g @vue/cli

with NPM or:

yarn global add @vue/cli

with Yarn.

Then we run:

vue create drag-and-drop

and select all the default options to create the project.

Create the Drag and Drop App

To create the drag and drop app, we write:

<template>
  <h2>Draggable Elements</h2>
  <div
    class="draggable"
    :draggable="true"
    @dragstart="drag($event, o)"
    v-for="o of origin"
    :key="o"
    @click.stop
  >
    {{ o }}
  </div>

<h2>Target</h2>
  <div id="target" @dragover.prevent @drop="drop">
    <div class="draggable" v-for="t of target" :key="t">
      {{ t }}
    </div>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      origin: ["apple", "orange", "grape"],
      target: [],
    };
  },
  methods: {
    drag(ev, text) {
      ev.dataTransfer.setData("text", text);
    },
    drop(ev) {
      const text = ev.dataTransfer.getData("text");
      const index = this.origin.findIndex((o) => o === text);
      this.origin.splice(index, 1);
      this.target.push(text);
    },
  },
};
</script>

<style scoped>
.draggable {
  border: 1px solid black;
  margin-right: 5px;
}

#target {
  border: 1px solid black;
  width: 95vw;
  height: 100px;
  padding: 5px;
}
</style>

In the template, we have divs under the Draggable Elements heading.

We style the divs by setting the class of each div to draggable .

Then we add a border to the draggable class.

To make the divs draggable, we set the draggable prop to true .

Next, we add the @dragstart directive to listen for the dragstart event, which is triggered when we first start dragging the div.

We use v-for to render the items in the origin array.

And we set the key to the origin entry so that Vue 3 can identify the items.

The entries are unique so we can just assign them as the value of the key prop.

Also, we have the @click.stop directive to stop the propagation of the click event.

Below the Target heading, we have the container div for the draggable items.

We have the @dragover.prevent directive to prevent the default behavior when we drag over the div which lets us keep dragging the item.

The @drop directive lets us call drop to put the items in the target array.

We render the target array inside the div with ID target with v-for .

In the script tag, we have the data method which has the origin and target reactive properties.

The drag method calls ev.dataTransfer.data to set the data we’re transferring when we start dragging the element.

In the drop method, we call ev.dataTransfer.getData to get the data by the key and return the item with key 'text' .

Then we find the item in the origin array and remove it from it with splice .

Then finally, we call this.target.push to append the item to the target array.

The style tag has some styles for the draggable items and the target container div.

Now we can drag the items from the Draggable Elements section to the Target section.

Conclusion

We can add drag and drop features easily into our app with Vue 3 and JavaScript.

Vue 3 is the latest version of the easy to use Vue JavaScript framework that lets us create front end apps.

In this article, we’ll look at how to create a JSON to CSV cowith Vue 3 and JavaScript.

Create the Project

We can create the Vue project with Vue CLI.

To install it, we run:

npm install -g @vue/cli

with NPM or:

yarn global add @vue/cli

with Yarn.

Then we run:

vue create json-to-csv

and select all the default options to create the project.

Create the JSON to CSV Converter

To create the JSON to CSV converter, we write:

<template>
  <form @submit.prevent="convert">
    <div>
      <label>json</label>
      <textarea v-model="json"></textarea>
    </div>
    <button type="submit">convert</button>
  </form>
  <div>
    <label>csv</label>
    <textarea v-model="csv"></textarea>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      json: "",
      csv: "",
    };
  },
  methods: {
    convert() {
      const parsedJson = JSON.parse(this.json);
      if (
        !Array.isArray(parsedJson) ||
        !parsedJson.every((p) => typeof p === "object" && p !== null)
      ) {
        return;
      }
      const heading = Object.keys(parsedJson[0]).join(",");
      const body = parsedJson.map((j) => Object.values(j).join(",")).join("n");
      this.csv = `${heading}${body}`;
    },
  },
};
</script>

In the template, we have a form that takes the JSON array string.

The textarea in the form has v-model to bind the inputted value to the json reactive property.

The form element has the @submit directive to listen to the submit event which is triggered when we click convert.

prevent lets us do client-side form submission instead of server-side.

Below that, we have a div to display the CSV result in the textarea.

We bind it to the csv reactive property with v-model .

In the script tag, we have the data method to return the reactive properties.

Then in the convert method, we parse the json string with JSON.parse .

And then we check if the parsed object is an array and that all entries are objects.

Then we create the heading from the keys of the first entry.

We get the keys with Object.keys .

Then we get all the values with Object.values and the join them together with commas with join .

And we join the rows together with join and a new line character as the argument.

Finally, we assign a string with heading and body combined to this.csv to display the result in the 2nd textarea.

Conclusion

We can create a JSON to CSV converter with Vue 3 and JavaScript.