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July 17, 2021 18:01
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Simple javascript script adding subtracting value input, Code taken from: https://www.youtube.com/watch?v=1TU-ssZSuYQ
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| <!DOCTYPE html> | |
| <html lang="es"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <form action="" name="ejemplo15" method="POST"> | |
| Producto XYZ: | |
| <input type="text" name="Cantidad" value="1" size="2" > | |
| <input type="button" value="aumentar" onclick="ejemplo15.Cantidad.value++;validaCantidad(this.form)" > | |
| <input type="button" value="disminuir" onclick="ejemplo15.Cantidad.value--;validaCantidad(this.form)" > | |
| </form> | |
| <script> | |
| // valor0 = ejemplo15.Cantidad.value; | |
| // console.log(valor0); | |
| function validaCantidad(form){ | |
| if(form.Cantidad.value < 1) | |
| { | |
| form.Cantidad.value = 1; | |
| alert("no puede comprar menos de un producto"); | |
| } | |
| if(form.Cantidad.value >10){ | |
| form.Cantidad.value = 10; | |
| alert("la cantidad máxima de productos a comprar es de 10 productos") | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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