css Audio - Active file-generic CSS - Active Generic - Active HTML - Active JS - Active SVG - Active Text - Active file-generic Video - Active header Love html icon-new-collection icon-person icon-team numbered-list123 pop-out spinner split-screen star tv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <!DOCTYPE html>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Ovulation Predictor Calc in Vue</title>

  <section class="hero is-primary has-text-centered">
  <div class="hero-body">
    <div class="container">
      <h1 class="title is-1">Ovulation Predictor Calculator</h1>
  <section id="app" class="section content has-text-centered">

    <div class="content columns level is-centered
" v-if="!calcReturned">

      <div class="column is-one-third level has-text-centered ">
        <p class="subtitle">Please select the first day of your last menstrual period:</p>
        <vuejs-datepicker :inline="true" v-model="date">{{ date }}</vuejs-datepicker>

      <div class="column is-one-third has-text-centered level">
        <p>Usual number of days in your cycle:</p>
        <div class="select is-primary">
          <select name="days" v-model="cycleSelected">
            <option v-for="n in 45" v-if="n >= 20">{{ n }}</option>

        <div class="level-item">
          <button class="button is-large is-primary is-rounded " id="calculate-btn" @click="startCalc(); calculateFertileBegin(); calculateFertileEnds(); calculateDueDate();">Calculate</button>

    <div class="content has-text-centered" v-else>

      <p class="subtitle">Here are the results based on the information you provided:</p>
      <p>Your next most fertile period is <strong>{{ fertileFrom }}</strong> to <strong>{{ fertileUntil }}</strong>.</p>
      <p>If you conceive within this timeframe, your estimated due date will be <strong>{{ dueDate }}</strong>.</p>
      <div class="level-item">
        <button class="button is-large is-primary is-rounded" id="resetCalc" @click="resetCalc">Calculate Again</button>


    <div class="notification is-full">*Average length will vary by woman. **A woman's best days to conceive can start at least one day prior and last at least one day after fertile date.


              /* Override Vue Datepicker CSS */

.vdp-datepicker__calendar {
    width: 100% !important;
.vdp-datepicker__calendar .cell.selected {
    background: #00d2b2 !important;
    color: #fff;
    font-weight: bold;
.vdp-datepicker__calendar .cell:not(.blank):not(.disabled).day:hover, .vdp-datepicker__calendar .cell:not(.blank):not(.disabled).month:hover, .vdp-datepicker__calendar .cell:not(.blank):not(.disabled).year:hover {
    border: 1px solid #00d2b2 !important;
.vdp-datepicker__calendar .cell.selected:hover {
    background: #00d2b2 !important;
.select {
  margin-bottom: 1em;
              // Ovulation Predictor Calculator using Vue.js + Vue Datepicker + MomentJS + Bulma CSS

new Vue({
  el: '#app',
  components: {
  data() {
    return {
      calcReturned: false,
      date: new Date(),
      cycleSelected: 28,
      fertileFrom: "",
      fertileUntil: "",
      dueDate: "",
      fullDate: "",
  methods: {
    startCalc: function() {
      this.calcReturned = true;
    calcDate: function() {
      var day = parseInt(document.querySelector("span.day.selected").innerHTML);
      var month = document.querySelector("span.month.selected").innerHTML;
      var year = parseInt(document.querySelector("span.year.selected").innerHTML);

      var months = [
      months.forEach(function (value, i) {
      if (value === month && i <= 8 ) {
        i ++;
        month = "0" + i.toString();
      } else if (value === month && i >= 9 ) {
          i ++;
        month = i.toString();
      this.fullDate = year + "" + month + "" + day;
    calculateFertileBegin: function() {
      if ( this.cycleSelected === 28) {
        this.fertileFrom = moment(this.fullDate, 'YYYYMMDD').add(12, 'days').format('MMMM Do YYYY');
      } else {
          this.fertileFrom = moment(this.fullDate, 'YYYYMMDD').add(this.cycleSelected - 28 + 12, 'days').format('MMMM Do YYYY');  
    calculateFertileEnds: function() {
      //this.calcDate(); is called from calculateFertileBegin
      if ( this.cycleSelected === 28) {
        this.fertileUntil = moment(this.fullDate, 'YYYYMMDD').add(16, 'days').format('MMMM Do YYYY');
      } else {
          this.fertileUntil = moment(this.fullDate, 'YYYYMMDD').add(this.cycleSelected - 28 + 16, 'days').format('MMMM Do YYYY');  
    calculateDueDate: function() {
      //this.calcDate(); is called from calculateFertileBegin
      if ( this.cycleSelected === 28) {
        this.dueDate = moment(this.fullDate, 'YYYYMMDD').add(280, 'days').format('MMMM Do YYYY');
      } else {
          this.dueDate = moment(this.fullDate, 'YYYYMMDD').add(this.cycleSelected - 28 + 280, 'days').format('MMMM Do YYYY');  
    resetCalc: function() {
      this.calcReturned = false;
      this.date = new Date();
      this.cycleSelected = 28;
      this.fertileFrom = "";
      this.fertileUntil = "";
      this.dueDate = "";
      this.fullDate = "";

🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................