Alert in an html boot

Question

hi, I have an html button and when I click on it I would like to display an Alert, how do I do this ?

follow the button code:

<input type="submit" class="btn btn-primary" id="btn_cadastro" oneclick="cadastro()"/>

Answer 1

Your button is right, you just need to change the oneclick to onclick.

See the code below:

function cadastro(){
  alert('ok');
}

<input type="submit" class="btn btn-primary" id="btn_cadastro" onclick="cadastro()"/>

Answer 2

I believe your syntax is incorrect the function call should be "onclick" and not "oneclick" see:

<input type="submit" class="btn btn-primary" id="btn_cadastro" onclick="cadastro()"/>

Check if your function is declared...

<script>
    function cadastro(){
       alert('Sua mensagem aqui!');
    }
</script>

Answer 3

In HTML

<input type="submit" class="btn btn-primary" id="btn_cadastro" onclick="cadastro();" />

In your Javascript

function cadastro() {
    alert("Oiii");
}

See an example working:

https://jsfiddle.net/sq9pc64j/1/

Your mistake is that you wrote onclick wrong