javascript - if statement doesnt work when included with two variables

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javascript - if statement doesnt work when included with two variables

asked Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

I want to create a simple login system with the help of javascript. Unfortunately, the if statement doesn't work as I've intended it to. The page doesn't redirect when the enter key is pressed.

var objPeople = [
	{studentid: "input1"},
	{studentid: "input2"}
]

var input = document.getElementById("myInput");
input.addEventListener("keyup", function(event){
    for(i = 0; i < objPeople.length; i++){
      if (myInput == objPeople[i].myInput && event.keyCode === 13){
        window.location.href = "www.google.com"; 
      }
    }
  });

<html>
    <head>
        <script LANGUAGE="JavaScript" src="JavaScript.js"></script>
        <title>aaa</title>
    </head>
    <body>
        <input type="text" id="myInput">
    </body>
</html>

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1 Answer

深蓝 · Answer 1 · 2022-01-31T07:23:39+0000

myInput is undefined for your event, you should get the value by adding following line in your eventListener.

 let myInput= document.getElementById("myInput").value;

Change your code like following.

var input = document.getElementById("myInput");
input.addEventListener("keyup", function(event) {
  let myInput = document.getElementById("myInput").value;
  for (i = 0; i < objPeople.length; i++) {
    if (myInput == objPeople[i].studentid && event.keyCode === 13) {
      console.log(objPeople[i].studentid);
      window.location.href = "https://www.google.com";
    }
  }
});

Edit: Sample

var objPeople = [{
    studentid: "input1"
  },
  {
    studentid: "input2"
  }
]

var input = document.getElementById("myInput");
input.addEventListener("keyup", function(event) {
  let myInput = document.getElementById("myInput").value;
  for (i = 0; i < objPeople.length; i++) {
    if (myInput == objPeople[i].studentid && event.keyCode === 13) {
      console.log(objPeople[i].studentid);
      window.location.href = "https://www.google.com";
    }
  }
});

<html>

<head>
  <script LANGUAGE="JavaScript" src="JavaScript.js"></script>
  <title>aaa</title>
</head>

<body>
  <input type="text" id="myInput">
</body>

</html>

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