How can I automatically trigger an enter key press event after a certain action is executed?

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I\'m writing some unit test in my web apps and I want to automatically trigger an Enter key pressed event from my page after for example a download to text file b

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4条回答

无人共我

2021-01-02 10:44

Create a variable that tells us if the user has clicked your button.
```
var clicked = false;
```
Add an event listener to your button, so that when the user clicks on it, the clicked variable will become true.
```
myButton.addEventListener('click', function(){
  clicked = true;
});
```

Add a keypress event listener:

document.addEventListener('keypress', function(e) {
  // `e` is the event
});

Inside that event listener, check if the user clicked previously
```
if(clicked) {
  // ...
}
```

If (s)he did, check the pressed key. Enter's key code is 13.

var keynum = e.keyCode||e.which;
if(keynum == 13) {
   // ...
}

If the pressed key was enter, use
```
clicked = false;
```
Otherwise, once the user clicked your button and pressed enter, it wouldn't be necessary to click the button again.
After that run your code. For example, this will call function f after 2 seconds.
```
setTimeout(f, 2000);
```

Live demo

var clicked = false;
document.querySelector('#btn').addEventListener('click', function(){
  clicked = true;
  snippet.log("You clicked the button. `clicked` is now `true`");
});
document.addEventListener('keypress', function(e) {
  if(clicked) {
    var keynum = e.keyCode || e.which;
    if(keynum == 13) {
      clicked = false; 
      snippet.log("`clicked` is now `false`. Waiting 2 seconds...");
      setTimeout(f, 2000);
    }
  }
});
function f() {
  snippet.log("Function `f` executed successfully!");
}

#btn {
  border: 3px solid red;
  cursor: pointer;
}

<div id="btn">Click me, and then press enter.</div>
<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 --><script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>

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忘掉有多难

2021-01-02 11:00

If I get your question right, this is what you are looking for

<html>
<head>

  <script src="http://code.jquery.com/jquery-latest.js"></script>

  <script type="text/javascript">
      $(document).keydown(function(event){
            if(event.keyCode == 13){                
                alert("keypressed");
            }
        });

function clickevent()
{                
     var e = $.Event("keydown");
     e.which = 13;
     e.keyCode = 13;
     $(document).trigger(e);     
}
</script>

</head>
<body id="thebody">
  <input type="button" onclick="clickevent()" value="click me first">
</body>
</html>

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余生分开走

2021-01-02 11:00
If you're talking about automatically entering an Enter key to trigger a submit event, you can use this instead:
```
$("#formID").submit();
```
To trigger this event after a button has been pressed, try this:
```
$("#buttonID").click(function() {
    $("#formID").submit(); // submits form
});
```
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被撕碎了的回忆

2021-01-02 11:00

$("#txtfield").keyup(function(e) {
 if(e.keyCode == 13) {
  $("#submit").submit();
 }
});

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