Trying to make a graph slideshow using (altair, html, css, js)

Intent:

Want to create a script that:

  1. Create altair charts
  2. Saves and embeds them into html slideshow skeleton
  3. Uses components.html to show html in streamlit

I have found resources (below) for tackling some of the problems but still struggle to combined them. I suspect it is from my lack of knowledge about html/css/js and was wondering if anyone could fill int he gaps and combine them?

Saving Altair Charts to HTML

Multiple Charts in one HTML · Issue #1422 · altair-viz/altair · GitHub

import altair as alt
import pandas as pd

two_charts_template = """
<!DOCTYPE html>
<html>
<head>
  <script src="https://cdn.jsdelivr.net/npm/vega@{vega_version}"></script>
  <script src="https://cdn.jsdelivr.net/npm/vega-lite@{vegalite_version}"></script>
  <script src="https://cdn.jsdelivr.net/npm/vega-embed@{vegaembed_version}"></script>
</head>
<body>

<div id="vis1"></div>
<div id="vis2"></div>

<script type="text/javascript">
  vegaEmbed('#vis1', {spec1}).catch(console.error);
  vegaEmbed('#vis2', {spec2}).catch(console.error);
</script>
</body>
</html>
"""


df = pd.DataFrame({'x': range(5), 'y': range(5)})

chart1 = alt.Chart(df).mark_point().encode(x='x', y='y')
chart2 = alt.Chart(df).mark_line().encode(x='x', y='y')

with open('charts.html', 'w') as f:
    f.write(two_charts_template.format(
        vega_version=alt.VEGA_VERSION,
        vegalite_version=alt.VEGALITE_VERSION,
        vegaembed_version=alt.VEGAEMBED_VERSION,
        spec1=chart1.to_json(indent=None),
        spec2=chart2.to_json(indent=None),
    ))
Making a slide show using html, css, js

How To Create a Slideshow

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}
.mySlides {display: none}
img {vertical-align: middle;}

/* Slideshow container */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* The dots/bullets/indicators */
.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .prev, .next,.text {font-size: 11px}
}
</style>
</head>
<body>

<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <img src="img_nature_wide.jpg" style="width:100%">
  <div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">2 / 3</div>
  <img src="img_snow_wide.jpg" style="width:100%">
  <div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">3 / 3</div>
  <img src="img_mountains_wide.jpg" style="width:100%">
  <div class="text">Caption Three</div>
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</a>

</div>
<br>

<div style="text-align:center">
  <span class="dot" onclick="currentSlide(1)"></span> 
  <span class="dot" onclick="currentSlide(2)"></span> 
  <span class="dot" onclick="currentSlide(3)"></span> 
</div>

<script>
var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";  
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";  
  dots[slideIndex-1].className += " active";
}
</script>

</body>
</html> 

Got the fix to my problem. I’m not a full-stack expert, so the solution may be rough but it works. My initial problems arise because the python replace method would have issues when javascript and CSS were in the same HTML file. So i seperated them into separate files, read them using open() into a python script where I eventually combined them.

Python
import streamlit as st
import streamlit.components.v1 as components
import altair as alt
from vega_datasets import data

cars = data.cars()

st.title('Altair Slideshow')

chart1 = alt.Chart(cars).mark_point().encode(
    x='Horsepower:Q',
    y='Miles_per_Gallon:Q',
    color='Origin:N'
)

chart2 = alt.Chart(cars).mark_bar().encode(
    x=alt.X('Miles_per_Gallon', bin=alt.Bin(maxbins=30)),
    y='count()',
    color='Origin'
)

chart3 = alt.Chart(cars).mark_area(opacity=0.3).encode(
    x=alt.X('Year', timeUnit='year'),
    y=alt.Y('ci0(Miles_per_Gallon)', axis=alt.Axis(title='Miles per Gallon')),
    y2='ci1(Miles_per_Gallon)',
    color='Origin'
).properties(
    width=800
)

html = open('slide.html', 'r').read()
css = open('style.css', 'r').read()
js = open('script.js', 'r').read()
html = html.format(
    css_styler=css,
    slide_script=js,
    vega_version=alt.VEGA_VERSION,
    vegalite_version=alt.VEGALITE_VERSION,
    vegaembed_version=alt.VEGAEMBED_VERSION,
    spec1=chart1.to_json(indent=None),
    spec2=chart2.to_json(indent=None),
    spec3=chart3.to_json(indent=None)

)

components.html(html, height=800,scrolling=True)
HTML (slide.html)
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
{css_styler}
</style>
<script src="https://cdn.jsdelivr.net/npm/vega@{vega_version}"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-lite@{vegalite_version}"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-embed@{vegaembed_version}"></script>
</head>
<body>

<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">1 / 3</div>
  <div id="vis1"></div>
  <div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">2 / 3</div>
  <div id="vis2"></div>
  <div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
  <div class="numbertext">3 / 3</div>
  <div id="vis3"></div>
  <div class="text">Caption Three</div>
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</a>

</div>
<br>

<div style="text-align:center">
  <span class="dot" onclick="currentSlide(1)"></span> 
  <span class="dot" onclick="currentSlide(2)"></span> 
  <span class="dot" onclick="currentSlide(3)"></span> 
</div>

<script>
{slide_script}
</script>
<script type="text/javascript">
  vegaEmbed('#vis1', {spec1}).catch(console.error);
  vegaEmbed('#vis2', {spec2}).catch(console.error);
  vegaEmbed('#vis3', {spec3}).catch(console.error);
</script>
</body>
</html> 
CSS (style.css)
* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}
.mySlides {display: none}
img {vertical-align: middle;}

/* Slideshow container */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* The dots/bullets/indicators */
.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .prev, .next,.text {font-size: 11px}
}
JS (script.js)
var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";  
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";  
  dots[slideIndex-1].className += " active";
}

Next step:
Need to edit python script., to be able to dynamically increase the number of graphs.