function set_touched(event) {
    var hidden_field_id = this.id.substring(0, this.id.length-7) + "touched_0";
    var touch_element = document.getElementById(hidden_field_id);
    touch_element.value = "True";
    this.removeEventListener('change', set_touched)
}

function set_value(event) {
    this.setAttribute('value',this.value);
}

function updateTextInput(name,val) {
    document.getElementById(name).value=val
}
 
var sliders = document.getElementsByClassName("slider");

for (i = 0; i < sliders.length; i++) {
    sliders[i].addEventListener('change', set_touched);
    sliders[i].addEventListener('change', set_value);
}