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javascript - 如何在几种不同的函数中插入由提示收集的信息，以显示在JavaScript的Div元素中？

我试图通过各自功能各自的提示从用户收集信息。我测试了这些功能后，它们各自的功能都会自己工作。接下来，我试图使用函数financialInfoDisplay（）在Div中显示信息，但出现以下错误消息


  未捕获的TypeError：无法在以下位置设置null的属性“ innerHTML”
  financialInfoDisplay


并且在浏览器中未显示提示。为什么会这样，我该如何解决？

我什至尝试过在每个函数中都包含将.innerHTML添加到div的代码，该方法可以正常工作，但是一旦我向div添加另一个提示，第一个提示就会消失。

我什至尝试将参数而不是诸如var userWithdrawal，userName，depositAmount之类的全局变量添加到financialInfoDisplay（）中，然后在调用所述函数时将这些变量作为参数传递，但这也不起作用。



//GLOBAL VARIABLES
var userWithdrawal, userName, depositAmount;

//GETS ELEMENT FROM DOM
var $ = function (id) {
    "use strict";
    return window.document.getElementById(id);
};
//GETS USER NAME
function namePrompt () {
    "use strict";
    userName = window.prompt("Please enter your name");
    return userName;
}

//GETS DEPOSIT AMOUNT
function depositAmountPrompt () {
    "use strict";
    depositAmount = window.prompt("Please enter the amount of money you would like to deposit");
    return depositAmount;

}
//GETS WITHDRAWAL Amount
function withdrawalAmount () {
    "use strict";
     userWithdrawal = window.prompt("Please enter the amount of money you would like to withdrawal from your account");
     return userWithdrawal;
}

//DISPLAYS THE PROMPTS WITHIN A DIV
function financialInfoDisplay() {
    "use strict";
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML = userName + depositAmount + userWithdrawal;
    return infoDisplay;
}

financialInfoDisplay();

//HANDLES ALL EVENT LISTENERS
function init() {
    "use strict";
    $('nameBtn').addEventListener("click", namePrompt);
    $('depositBtn').addEventListener("click", depositAmountPrompt);
    $('withdrawlBtn').addEventListener("click", withdrawalAmount)

}
window.addEventListener("load", init);







<style>body {
  width: 500px;
  margin: 0 auto;
}

#infoDisplay {
  border: 3px solid black;
  height: 250px;
}

</style>

<body>
  <button type="button" id="nameBtn" value>Name</button>
  <button type="button" id="depositBtn">Deposit</button>
  <button type="button" id="withdrawlBtn">Withdrawl</button>
  <div id="infoDisplay"></div>
</body>

最佳答案

您应该在每个点击事件内调用financialInfoDisplay并在financialInfoDisplay中检查undefined，在您的情况下不需要返回值。

使用代码功能financialInfoDisplay()在加载时仅调用1次。

您不应放入标头标记，nameBtn不会生成，也无法为其设置事件处理程序。

HTML内容：

<style>
  body {
    width: 500px;
    margin: 0 auto;
  }

  #infoDisplay {
    border: 3px solid black;
    height: 250px;
  }
</style>

<body>
  <button type="button" id="nameBtn" value>Name</button>
  <button type="button" id="depositBtn">Deposit</button>
  <button type="button" id="withdrawlBtn">Withdrawl</button>
  <div id="infoDisplay"></div>
  <script>
    //GLOBAL VARIABLES
    var userWithdrawal, userName, depositAmount;

    //GETS ELEMENT FROM DOM
    var $ = function (id) {
      "use strict";
      return window.document.getElementById(id);
    };
    //GETS USER NAME
    function namePrompt() {
      "use strict";
      userName = window.prompt("Please enter your name");
      financialInfoDisplay();
      //return userName;
    }

    //GETS DEPOSIT AMOUNT
    function depositAmountPrompt() {
      "use strict";
      depositAmount = window.prompt("Please enter the amount of money you would like to deposit");
      //return depositAmount;
      financialInfoDisplay();

    }
    //GETS WITHDRAWAL Amount
    function withdrawalAmount() {
      "use strict";
      userWithdrawal = window.prompt("Please enter the amount of money you would like to withdrawal from your account");
      financialInfoDisplay();
      //return userWithdrawal;
    }

    //DISPLAYS THE PROMPTS WITHIN A DIV
    function financialInfoDisplay() {
      "use strict";
      if (userName != undefined) {
        var infoDisplay = window.document.getElementById('infoDisplay').innerHTML = userName;
      }
      if (depositAmount != undefined) {
        var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += depositAmount;
      }
      if (userWithdrawal != undefined) {
        var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += userWithdrawal;
      }

      //return infoDisplay;
    }

    //HANDLES ALL EVENT LISTENERS
    function init() {
      "use strict";
      $('nameBtn').addEventListener("click", namePrompt);
      $('depositBtn').addEventListener("click", depositAmountPrompt);
      $('withdrawlBtn').addEventListener("click", withdrawalAmount)

    }
    window.addEventListener("load", init);
  </script>
</body>

function financialInfoDisplay() {
    "use strict";
    if(userName != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML = userName;
    }
    if(depositAmount != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += depositAmount;
    }
    if(userWithdrawal != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += userWithdrawal;
    }

    //return infoDisplay;
}





//GLOBAL VARIABLES
var userWithdrawal, userName, depositAmount;

//GETS ELEMENT FROM DOM
var $ = function (id) {
    "use strict";
    return window.document.getElementById(id);
};
//GETS USER NAME
function namePrompt () {
    "use strict";
    userName = window.prompt("Please enter your name");
    financialInfoDisplay();
    //return userName;
}

//GETS DEPOSIT AMOUNT
function depositAmountPrompt () {
    "use strict";
    depositAmount = window.prompt("Please enter the amount of money you would like to deposit");
    //return depositAmount;
    financialInfoDisplay();

}
//GETS WITHDRAWAL Amount
function withdrawalAmount () {
    "use strict";
     userWithdrawal = window.prompt("Please enter the amount of money you would like to withdrawal from your account");
     financialInfoDisplay();
     //return userWithdrawal;
}

//DISPLAYS THE PROMPTS WITHIN A DIV
function financialInfoDisplay() {
    "use strict";
    if(userName != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML = userName;
    }
    if(depositAmount != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += depositAmount;
    }
    if(userWithdrawal != undefined){
    var infoDisplay = window.document.getElementById('infoDisplay').innerHTML += userWithdrawal;
    }

    //return infoDisplay;
}



//HANDLES ALL EVENT LISTENERS
function init() {
    "use strict";
    $('nameBtn').addEventListener("click", namePrompt);
    $('depositBtn').addEventListener("click", depositAmountPrompt);
    $('withdrawlBtn').addEventListener("click", withdrawalAmount)

}
window.addEventListener("load", init);

<style>body {
  width: 500px;
  margin: 0 auto;
}

#infoDisplay {
  border: 3px solid black;
  height: 250px;
}

</style>

<body>
  <button type="button" id="nameBtn" value>Name</button>
  <button type="button" id="depositBtn">Deposit</button>
  <button type="button" id="withdrawlBtn">Withdrawl</button>
  <div id="infoDisplay"></div>
</body>

关于javascript - 如何在几种不同的函数中插入由提示收集的信息，以显示在JavaScript的Div元素中？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/55756675/

10-09 23:40
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