如何导出Win Elm的控制台日志？

编程问答 2022-06-11

问题描述

很难用Elm导出console.log。

我想通过按下下面的按钮并使用控制台登录功能来输出控制台日志。我该怎么办？

clasp status

如果我使用Javascript，我想做下面的事情。

<!DOCTYPE html>
<html>
<head>
<Meta name="viewport" content="width=device-width,initial-scale=1">
<style>
body {font-family: Arial,Helvetica,sans-serif;}


$(":checkBox").on('click',function(){
  $('.proceed').toggleClass("checked");
});
.proceed{
  display:none;
}
.checked{
  display:block;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>


.modal {
  display: none; 
  position: fixed; 
  z-index: 1; 
  padding-top: 100px; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  overflow: auto;
  background-color: rgb(0,0); 
  background-color: rgba(0,0.4); 
}

.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  border: 1px solid #888;
  width: 80%;
  Box-shadow: 0 4px 8px 0 rgba(0,0.2),0 6px 20px 0 rgba(0,0.19);
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.4s;
  animation-name: animatetop;
  animation-duration: 0.4s
}

@-webkit-keyframes animatetop {
  from {top:-300px; opacity:0} 
  to {top:0; opacity:1}
}

@keyframes animatetop {
  from {top:-300px; opacity:0}
  to {top:0; opacity:1}
}

.close {
  color: white;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}

.modal-header {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}

.modal-body {padding: 2px 16px;}

.modal-footer {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}
</style>
</head>
<body>

<h2>Animated Modal with Header and Footer</h2>

<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">&times;</span>
      <h2>Modal Header</h2>
    </div>
    <div class="modal-body">
      <p>Some text in the Modal Body</p>
      <p>Some other text...</p>
    </div>
    <div class="modal-footer">
      <h3>Modal Footer</h3>
    </div>
  </div>

</div>

<input type="checkBox" id="tos" onchange="changeTriggered()"> I Agree to the <a href="">Terms and Conditions</a> and <a href="">Privacy Policy</a>.
<br>
<button id="myBtn" class="proceed">Open Modal</button>

<script>
var modal = document.getElementById("myModal");

var btn = document.getElementById("myBtn");

var span = document.getElementsByClassName("close")[0];

btn.onclick = function() {
  modal.style.display = "block";
}

span.onclick = function() {
  modal.style.display = "none";
}

window.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = "none";
  }
}

function changeTriggered() {
  let tos = document.getElementById("tos");
  console.log(tos.checked);
  if(tos.checked) {
   modal.style.display = "block";
  }
}

</script>

</body>
</html>

解决方法

如果仅用于调试，则可以使用Debug.log，但是不能在生产代码中使用Debug模块（如果您使用--optimize运行编译器将无法编译有Debug个用法）。使用它可能像这样：

sampleView : Html Message
sampleView =
    Html.div (class "sample-card" :: Styles.sampleCard)
        [ Html.div
            (class "sample-card-list" :: Styles.sampleCardList)
            [
                Html.button
                    ([class "sample-card-button",onClick CardButtonClicked] ++ Styles.sampleCardListButton)
                    [
                        Html.text "サンプルボタン"
                    ]
            ]
        ]

update : Message -> Model -> ( Model,Cmd Message )
update msg model =
    case msg of
        CardButtonClicked ->
            let
                _ = Debug.log "クリックされました" msg
            in
            ( model,Cmd.none )

如果要在生产应用程序中写入控制台，则需要use a port。要创建端口，您需要更新其所在的模块以声明为port module（只需在文件第一行的模块声明的开头添加port）。 / p> 

port module Main exposing (..)

port consoleLog : String -> Cmd msg

update : Message -> Model -> ( Model,Cmd Message )
update msg model =
    case msg of
        CardButtonClicked ->
            ( model,consoleLog "クリックされました" )

然后，您需要连接一些JavaScript来处理该端口消息：

var app = Elm.Main.init({ node: document.querySelector('main') })
app.ports.consoleLog.subscribe(function (msg) {
    console.log(msg);
});

Here's an example app using a port呼叫console.log。

elm