IF condition according to option field selection

Question

I’m new to programming, I’m having a problem with my code:

var micro = "Micro Inversores";

if (micro.equals(document.getElementById("tipo_unidade"))) {
    var tipo1 = 1;
else
    var tipo1 = 0.8;
}

<select id="tipo_unidade" name="tipo_unidade" onchange="MudaLabeL('compl_Preco_1',txt_qtd_1.value)" style="width:660px">
    <option value="Micro Inversores">Micro Inversores</option>
    <option value="Inversor Tradicional">Inversor Tradicional</option>

I have a field <option> where the user selects an option, according to its selection, need the value of the variable tipo1 be it 0.8 or 1.

I tried too:

var char micro = "Micro Inversores";

if (micro = p_classe) {
    var tipo = 1;
else
    var tipo = 0.8;
}

document.getElementById("p_classe").innerHTML = (classeundValue);

function atualizaclasse() {
    var classeund = document.getElementById("tipo_unidade");
    classeundValue = classeund.value;
}

If I remove the condition part if and define, for example var tipo = 1;, the code works perfectly. My problem is in setting this value of 0.8 or 1 for the type variable, according to the user’s selection.

Answer 1

I set an example with the value as @Sam said

var micro = "Micro Inversores";
var valor = 0; // Veja que eu coloquei a variável valor em um escopo global

	function addEventHandler(elem, eventType, handler) {
		if (elem.addEventListener)
			elem.addEventListener (eventType, handler, false);
		else if (elem.attachEvent)
			elem.attachEvent ('on' + eventType, handler); 
	}

	addEventHandler(document, 'DOMContentLoaded', function() {
		addEventHandler(document.getElementById('tipo_unidade'), 'change', function() {
			if (document.getElementById("tipo_unidade").value == micro) {
				valor = 1;
			} else {
				valor = 0.8;
			}
			console.log(valor);
			document.getElementById('compl_Preco_1').value = valor;
		});
	});

<select id="tipo_unidade" name="tipo_unidade" style="width:660px">
    <option value="">Selecione uma opção</option>
	<option value="Micro Inversores">Micro Inversores</option>
	<option value="Inversor Tradicional">Inversor Tradicional</option>
</select>

<input type="text" id="compl_Preco_1">

Answer 2

If I understood your question correctly, you could use the values you need as value of each option:

<select id="tipo_unidade" name="tipo_unidade" onchange="MudaLabeL('compl_Preco_1',txt_qtd_1.value)" style="width:660px">
    <option value="1">Micro Inversores</option>
    <option value="0.8">Inversor Tradicional</option>
</select>

Hence:

let tipo = parseFloat(document.getElementyById('tipo_unidade').value);

I did not test, but I believe it is the way. (Within what I understood of your question.)

Answer 3

You can do it like this:

function teste(a) {
     var micro = (a.value || a.options[a.selectedIndex].value);  
     var tipo1 = 0;
     
     if (micro == "Micro Inversores"){
           tipo1 = 1;
     }else if(micro == "Inversor Tradicional"){
           tipo1 = 0.8;
     }else{
           tipo1 = 0;
     }
    
    document.getElementById('compl_Preco_1').value = tipo1;
}

<select onChange="teste(this)" id="tipo_unidade" name="tipo_unidade"  style="width:660px">
      <option value="">-Selecione</option>
     <option value="Micro Inversores">Micro Inversores</option>
     <option value="Inversor Tradicional">Inversor Tradicional </option>
</select>

<input type="text" id="compl_Preco_1">

Answer 4

thank you very much for the help, incredible as it may seem, it was something silly on Cód (as always) that was making everything go wrong.

        #COMO FUNCIONOU ↓
        var micro = "Micro Inversores";
        if (document.getElementById("tipo_unidade").value == micro) {
            var tipon = 1;
        } else {
            var tipon = 0.8;
        }

        #CÓDIGO DANDO PROBLEMAS ↓
        var micro = "Micro Inversores";
        if (micro.equals(document.getElementById("tipo_unidade"))) {
        var tipo1 = 1;
        else
        var tipo1 = 0.8;
        }

I did not get to test with the equals, the rule is clear, whether it worked leaves working (haha), but I had forgotten to close and open keys in if '-' } LSE {

I made a big deal out of it, but anyway, thank you so much for trying to help me!!