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App inventor 2 en español
Cómo programar los teléfonos móviles con Android
mediante App inventor 2 - Juan Antonio Villalpando

-- Tutorial de iniciación de App Inventor 2 en español --

Volver al índice del tutorial

____________________________

169C4.- JavaScript y crear un Deslizador en una página web. Slider.

p169C4_javascript_deslizador.aia

- Vamos a crear un Deslizador mediante JavaScript.

- Utilizaremos códigos de:

https://www.w3schools.com/howto/howto_js_rangeslider.asp

_________________
- Diseño.

_________________
- Bloques.

_________________
- Código de JavaScript.

slider.htm 

<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
<style>
.slidecontainer {
  width: 100%;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 25px;
  background: #d3d3d3;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  background: #04AA6D;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 25px;
  height: 25px;
  background: #04AA6D;
  cursor: pointer;
}
</style>

</head>
<body>
<div class="slidecontainer">
  <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
</div>

<script>
var slider = document.getElementById("myRange");

/// 	THIS LINE FOR CONTINUOUS CHANGE    ////
slider.oninput = function() {window.AppInventor.setWebViewString("" + slider.value);}
///////////////////////////////////////////////////////////////////////////

/// 	THIS LINE FOR TOUCH UP    ////
// slider.addEventListener('change', () => {window.AppInventor.setWebViewString("" + slider.value);});
///////////////////////////////////////////////////////////////////////////
</script>
</body>
</html>

- Si ponemos la línea:

slider.oninput = function() {window.AppInventor.setWebViewString("" + slider.value);}

El Deslizador mostrará los valores según desplazemos el cursor.

- Si ponemos la línea:

slider.addEventListener('change', () => {window.AppInventor.setWebViewString("" + slider.value);});

El Deslizador mostrará el valor cuando soltemos el cursor.

_________________
- Comentarios.

- En versiones anteriores de App Inventor para leer el archivo cuando estamos emulando utilizábamos:

file:///mnt/sdcard/AppInventor/assets/slider.htm

- Cuando instalábamos utilizábamos:

file:///android_asset/slider.htm

- Actualmente utilizamos esta url para emular e instalar:

http://localhost/slider.htm

_________________
2.- Deslizador. Entrada de valor.

p169C4_javascript_deslizador_Entra.aia

- En este ejemplo podemos situar el valor del Deslizador en una posición indicada desde la aplicación.

- Mediante un Botón situamos el Deslizador en la posición 80.

- Mediante un componente Deslizador situamos el Deslizador en la posición que se va estableciendo.

_________________
- Diseño.

_________________
- Bloques.

_________________
- Código de JavaScript.

slider_input.htm 

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
<style>
.slidecontainer {
  width: 100%;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 25px;
  background: #0000FF;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  background: #FF0000;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 25px;
  height: 25px;
  background: #FFFF00;
  cursor: pointer;
}
</style>
</head>
<body>
<div class="slidecontainer">
  <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
</div>

<script>
var datos =  window.AppInventor.getWebViewString(); // Entrada de datos.
var slider = document.getElementById("myRange");
slider.value = datos;

/// 	THIS LINE FOR CONTINUOUS CHANGE    ////
slider.oninput = function() {window.AppInventor.setWebViewString("" + slider.value);}
///////////////////////////////////////////////////////////////////////////

/// 	THIS LINE FOR TOUCH UP    ////
// slider.addEventListener('change', () => {window.AppInventor.setWebViewString("" + slider.value);});
///////////////////////////////////////////////////////////////////////////
</script>
</body>
</html>

_________________
3.- Deslizador con dos rangos.

p169C4_javascript_deslizador3.aia

 

slider3.htm 

<!DOCTYPE html><head><meta charset="UTF-8">
<style>
.range-slider.flat {
  --thumb-size: 25px;
  --track-height: calc(var(--thumb-size) / 3);
  --progress-shadow: none;
  --progress-flll-shadow: none;
  --thumb-shadow: 0 0 0 7px var(--primary-color) inset, 0 0 0 99px white inset;
  --thumb-shadow-hover: 0 0 0 9px var(--primary-color) inset,
    0 0 0 99px white inset;
  --thumb-shadow-active: 0 0 0 13px var(--primary-color) inset;
}

.range-slider.overlay {
  --primary-color: #d6e9ff;
  --track-height: 50px;
  --thumb-size: var(--track-height);
  --thumb-color: var(--primary-color);
  --thumb-shadow: none;
  --progress-flll-shadow: none;
  --progress-shadow: none;
  --progress-background: none;
  --progress-radius: 0px;
  --ticks-color: var(--primary-color);
  --ticks-height: 0;
  --ticks-thickness: 0;
  --ticks-gap: 0px;
  --min-max-font: 700 18px Arial;
  --min-max-opacity: 1;
  --show-min-max: none;
  color: #0366d6;
}
.range-slider.overlay input:hover {
  --thumb-shadow: calc(25px - (50px * var(--is-left-most))) 0 0 -15px #0366d6
    inset;
}
.range-slider.overlay input:active {
  --thumb-color: inherit;
}
.range-slider.overlay .range-slider__values {
  width: calc(100% - 50% / (var(--max) - var(--min)));
}

.range-slider {
  --primary-color: #0366d6;
  --value-offset-y: var(--ticks-gap);
  --value-active-color: white;
  --value-background: transparent;
  --value-background-hover: var(--primary-color);
  --value-font: 700 12px/1 Arial;
  --fill-color: var(--primary-color);
  --progress-background: #eee;
  --progress-radius: 20px;
  --track-height: calc(var(--thumb-size) / 2);
  --min-max-font: 12px Arial;
  --min-max-opacity: 0.5;
  --min-max-x-offset: 10%;
  --thumb-size: 22px;
  --thumb-color: white;
  --thumb-shadow: 0 0 3px rgba(0, 0, 0, 0.4), 0 0 1px rgba(0, 0, 0, 0.5) inset,
    0 0 0 99px var(--thumb-color) inset;
  --thumb-shadow-active: 0 0 0 calc(var(--thumb-size) / 4) inset
      var(--thumb-color),
    0 0 0 99px var(--primary-color) inset, 0 0 3px rgba(0, 0, 0, 0.4);
  --thumb-shadow-hover: var(--thumb-shadow);
  --ticks-thickness: 1px;
  --ticks-height: 5px;
  --ticks-gap: var(
    --ticks-height,
    0
  );
  --ticks-color: silver;
  --step: 1;
  --ticks-count: Calc(var(--max) - var(--min)) / var(--step);
  --maxTicksAllowed: 30;
  --too-many-ticks: Min(1, Max(var(--ticks-count) - var(--maxTicksAllowed), 0));
  --x-step: Max(
    var(--step),
    var(--too-many-ticks) * (var(--max) - var(--min))
  );
  --tickInterval: 100/ ((var(--max) - var(--min)) / var(--step)) * var(--tickEvery, 1);
  --tickIntervalPerc: calc(
    (100% - var(--thumb-size)) / ((var(--max) - var(--min)) / var(--x-step)) *
      var(--tickEvery, 1)
  );
  --value-a: Clamp(
    var(--min),
    var(--value, 0),
    var(--max)
  );
  --value-b: var(--value, 0);
  --text-value-a: var(--text-value, "");
  --completed-a: calc(
    (var(--value-a) - var(--min)) / (var(--max) - var(--min)) * 100
  );
  --completed-b: calc(
    (var(--value-b) - var(--min)) / (var(--max) - var(--min)) * 100
  );
  --ca: Min(var(--completed-a), var(--completed-b));
  --cb: Max(var(--completed-a), var(--completed-b));
  --thumbs-too-close: Clamp(
    -1,
    1000 * (Min(1, Max(var(--cb) - var(--ca) - 5, -1)) + 0.001),
    1
  );
  --thumb-close-to-min: Min(1, Max(var(--ca) - 2, 0));
  --thumb-close-to-max: Min(1, Max(98 - var(--cb), 0));
  display: inline-block;
  height: max(var(--track-height), var(--thumb-size));
  background: linear-gradient(to right, var(--ticks-color) var(--ticks-thickness), transparent 1px) repeat-x;
  background-size: var(--tickIntervalPerc) var(--ticks-height);
  background-position-x: calc( var(--thumb-size) / 2 - var(--ticks-thickness) / 2 );
  background-position-y: var(--flip-y, bottom);
  padding-bottom: var(--flip-y, var(--ticks-gap));
  padding-top: calc(var(--flip-y) * var(--ticks-gap));
  position: relative;
  z-index: 1;
}
.range-slider[data-ticks-position=top] {
  --flip-y: 1;
}

.range-slider::before {
  --before: 1;
  --at-edge: var(--thumb-close-to-min);
  counter-reset: x var(--min);
  left: var(--offset);
}
.range-slider::after {
  --at-edge: var(--thumb-close-to-max);
  counter-reset: x var(--max);
  right: var(--offset);
}
.range-slider__values {
  position: relative;
  top: 50%;
  line-height: 0;
  text-align: justify;
  width: 100%;
  pointer-events: none;
  margin: 0 auto;
  z-index: 5;
}
.range-slider__values::after {
  content: "";
  width: 100%;
  display: inline-block;
  height: 0;
  background: red;
}
.range-slider__progress {
  --start-end: calc(var(--thumb-size) / 2);
  --clip-end: calc(100% - (var(--cb)) * 1%);
  --clip-start: calc(var(--ca) * 1%);
  --clip: inset(-20px var(--clip-end) -20px var(--clip-start));
  position: absolute;
  left: var(--start-end);
  right: var(--start-end);
  top: calc( var(--ticks-gap) * var(--flip-y, 0) + var(--thumb-size) / 2 - var(--track-height) / 2 );
  height: calc(var(--track-height));
  background: var(--progress-background, #eee);
  pointer-events: none;
  z-index: -1;
  border-radius: var(--progress-radius);
}
.range-slider__progress::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  -webkit-clip-path: var(--clip);
          clip-path: var(--clip);
  top: 0;
  bottom: 0;
  background: var(--fill-color, black);
  box-shadow: var(--progress-flll-shadow);
  z-index: 1;
  border-radius: inherit;
}
.range-slider__progress::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  box-shadow: var(--progress-shadow);
  pointer-events: none;
  border-radius: inherit;
}
.range-slider > input {
  -webkit-appearance: none;
  width: 100%;
  height: var(--thumb-size);
  margin: 0;
  position: absolute;
  left: 0;
  top: calc( 50% - Max(var(--track-height), var(--thumb-size)) / 2 + calc(var(--ticks-gap) / 2 * var(--flip-y, -1)) );
  cursor: -webkit-grab;
  cursor: grab;
  outline: none;
  background: none;
}
.range-slider > input:not(:only-of-type) {
  pointer-events: none;
}
.range-slider > input::-webkit-slider-thumb {
  -webkit-appearance: none;
          appearance: none;
  height: var(--thumb-size);
  width: var(--thumb-size);
  transform: var(--thumb-transform);
  border-radius: var(--thumb-radius, 50%);
  background: var(--thumb-color);
  box-shadow: var(--thumb-shadow);
  border: none;
  pointer-events: auto;
  -webkit-transition: 0.1s;
  transition: 0.1s;
}

.range-slider > input::-ms-thumb {
  appearance: none;
  height: var(--thumb-size);
  width: var(--thumb-size);
  transform: var(--thumb-transform);
  border-radius: var(--thumb-radius, 50%);
  background: var(--thumb-color);
  box-shadow: var(--thumb-shadow);
  border: none;
  pointer-events: auto;
  -ms-transition: 0.1s;
  transition: 0.1s;
}
.range-slider > input:hover {
  --thumb-shadow: var(--thumb-shadow-hover);
}
.range-slider > input:hover + output {
  --value-background: var(--value-background-hover);
  --y-offset: -5px;
  color: var(--value-active-color);
  box-shadow: 0 0 0 3px var(--value-background);
}
.range-slider > input:active {
  --thumb-shadow: var(--thumb-shadow-active);
  cursor: -webkit-grabbing;
  cursor: grabbing;
  z-index: 2;
}
.range-slider > input:active + output {
  transition: 0s;
}
.range-slider > input:nth-of-type(1) {
  --is-left-most: Clamp(0, (var(--value-a) - var(--value-b)) * 99999, 1);
}
.range-slider > input:nth-of-type(1) + output {
  --value: var(--value-a);
  --x-offset: calc(var(--completed-a) * -1%);
}
.range-slider > input:nth-of-type(1) + output:not(:only-of-type) {
  --flip: calc(var(--thumbs-too-close) * -1);
}
.range-slider > input:nth-of-type(1) + output::after {
  content: var(--prefix, "") var(--text-value-a) var(--suffix, "");
}
.range-slider > input:nth-of-type(2) {
  --is-left-most: Clamp(0, (var(--value-b) - var(--value-a)) * 99999, 1);
}
.range-slider > input:nth-of-type(2) + output {
  --value: var(--value-b);
}
.range-slider > input:only-of-type ~ .range-slider__progress {
  --clip-start: 0;
}
.range-slider > input + output {
  --flip: -1;
  --x-offset: calc(var(--completed-b) * -1%);
  --pos: calc(
    ((var(--value) - var(--min)) / (var(--max) - var(--min))) * 100%
  );
  pointer-events: none;
  position: absolute;
  z-index: 5;
  background: var(--value-background);
  border-radius: 10px;
  padding: 2px 4px;
  left: var(--pos);
  transform: translate(var(--x-offset), calc( 150% * var(--flip) - (var(--y-offset, 0px) + var(--value-offset-y)) * var(--flip) ));
  transition: all 0.12s ease-out, left 0s;
}
.range-slider > input + output::after {
  content: var(--prefix, "") var(--text-value-b) var(--suffix, "");
  font: var(--value-font);
}


@media screen and (max-width: 500px) {
  body {
    padding-top: 2em;
    gap: 8%;
  }
}

a {
  position: fixed;
  top: 1em;
  left: 1em;
  display: inline-block;
  height: 2em;
}
@media screen and (max-width: 500px) {
  a {
    position: static;
    order: -1;
  }
}
a > img {
  display: inherit;
  height: 100%;
}

body > .range-slider,
label[dir=rtl] .range-slider {
  width: clamp(300px, 50vw, 800px);
  min-width: 200px;
}
</style>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0">
</head>

<!-- Double range slider (flat design)  -->
<div class="range-slider flat"  style='--min:-50; --max:50; --value-a:-22; --value-b:40;'>
  <input type="range" min="-50" max="50" value="-22" id="myRange1">
  <input type="range" min="-50" max="50" value="40" id="myRange2">
  <div class='range-slider__progress'></div>
</div>

<script>
var slider1 = document.getElementById("myRange1");
var slider2 = document.getElementById("myRange2");

slider1.oninput = function() {slider1.parentNode.style.setProperty('--value-a',slider1.value); window.AppInventor.setWebViewString(slider1.value + "," + slider2.value); }
slider2.oninput = function() {slider2.parentNode.style.setProperty('--value-b',slider2.value); window.AppInventor.setWebViewString(slider1.value + "," + slider2.value); }
</script>

</body>
</html>

_________________
4.- Deslizador circular.

p169C4_javascript_deslizadorcirculo.aia

- Adaptación:
https://www.cssscript.com/circular-range-slider-svg/

 

__________________________________

 
- Mi correo:
juana1991@yahoo.com
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© Juan A. Villalpando
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