Add placeholder support

[yaphanlong]

Hi, is it possible to include placeholder support as shown below? Current workaround is to use javascript and target each input to inject placeholder.

[AlexMiniApps]

@yaphanlong Hi, I will research it, but it seems that this placeholder will not be native for the HTML.

[rbalet]

@AlexMiniApps @yaphanlong It would be actually possible by

1. Adding the has-value class up in the span (or adding a new class)
2. Displaying the following css in the span, if it doesn't have the class

span {
  &.has-value {
          &:after {
            content: "";
            position: absolute;
            height: 8px;
            width: 8px;
            top: calc(50% - 4px);
            left: calc(50% - 4px);
            background-image: radial-gradient(
                    circle at center,
                    lightgray 5px,
                    transparent 5px
            );
            border-radius: 100%;
            background-size: 20px;
            background-position: top center, bottom center;
            background-repeat: no-repeat;
    }
   }
}

I can make a pull-request if you wish

[AlexMiniApps]

@rbalet Thanks for the suggestion