The code snippet below is giving error because _element is returning null any idea how to solve?
class View {
constructor(seletor) {
this._elemento = document.querySelector(seletor);
}
update(model) {
this._elemento.innerHTML = this.template(model);
}
template(model) {
throw new Error('Você precisa implementar o método template');
}
}
class NegociacoesView extends View {
template(model) {
return '
<table class="table table-hover table-bordered">
<thead>
<tr>
<th>DATA</th>
<th>QUANTIDADE</th>
<th>VALOR</th>
<th>VOLUME</th>
</tr>
</thead>
<tbody>
${model.paraArray().map(negociacao =>
'
<tr>
<td>${DateConverter.paraTexto(negociacao.data)}</td>
<td>${negociacao.quantidade}</td>
<td>${negociacao.valor}</td>
<td>${negociacao.volume}</td>
</tr>
').join('')}
</tbody>
<tfoot>
<tr>
<td colspan="3"></td>
<td>${model.volumeTotal}</td>
</tr>
</tfoot>
</table>
'
}
}
class MensagemView extends View {
template(model) {
return model.texto
? '<p class="alert alert-info">${model.texto}</p>'
: '<p></p>';
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<title>Negociações</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body class="container">
<h1 class="text-center">Negociações</h1>
<div class="mensagemView"></div>
<form class="form">
<div class="form-group">
<label for="data">Data</label>
<input type="date" id="data" class="form-control" required autofocus/>
</div>
<div class="form-group">
<label for="quantidade">Quantidade</label>
<input type="number" min="1" step="1" id="quantidade" class="form-control" value="1" required/>
</div>
<div class="form-group">
<label for="valor">Valor</label>
<input id="valor" type="number" class="form-control" min="0.01" step="0.01" value="0.0" required />
</div>
<button class="btn btn-primary" type="submit">Incluir</button>
</form>
<div class="text-center">
<button id="botao-importa" class="btn btn-primary text-center" type="button">
Importar Negociações
</button>
<button id="botao-apaga" class="btn btn-primary text-center" type="button">
Apagar
</button>
</div>
<br>
<br>
<div id="negociacoes"></div>
<script src="app/domain/negociacao/Negociacao.js"></script>
<script src="app/controllers/NegociacaoController.js"></script>
<script src="app/ui/converters/DateConverter.js"></script>
<script src="app/domain/negociacao/Negociacoes.js"></script>
<script src="app/ui/views/View.js"></script>
<script src="app/ui/views/NegociacoesView.js"></script>
<script src="app/ui/models/Mensagem.js"></script>
<script src="app/ui/views/MensagemView.js"></script>
<script src="app/app.js"></script>
</body>
</html>