jquery script adding id and using it doesn't work

问题

i am trying to use my keyboard to click on a button using the id.

For some buttons i had to set the ID, which actually works. But as soon as i try to use the keyboard for the buttons where i set the id, it won't work.

I am not getting any errors and since adding the id to the element works, i am kinda confused why i cannot use the new set id later in the code.

//setting id for first button (works)
$( "a:contains('Im Verband freigeben')" ).attr('id', 'freigabe-verband');
//setting id for second button (works aswell)
$( "a:contains('Vorheriger Einsatz')" ).attr('id', 'vorheriger-einsatz');


$( document ).keydown(function(e) {
 if (e.keyCode == 39) {
    //works, id is available, not set by me
     $("#alert_next").click();

} else if (e.keyCode == 38){
    // doesn't work, but id is set
    $("#freigabe-verband").click();

} else if (e.keyCode == 40){
    // doesn't work, but id is set
    $("#vorheriger-einsatz").click();

} 
return e.returnValue;

});

Anyone know why? https://i.imgur.com/uy6oGFJ.png

回答1:

To click a dom element, use:-

$('#freigabe-verband')[0].click();

$('#freigabe-verband').get(0).click();

Example

$("a").attr('id', 'test');

$(document).keydown(function(e) {
	$('#test')[0].click();
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<a href="http://stackoverflow.com">link</a>

回答2:

It doesn't make sense. I copy your code and create a plunkr, it works well. http://plnkr.co/edit/Eb5QF6mB97Js41NFbr8J?p=preview

// Code goes here
$(function() {
  //setting id for first button (works)
  $( "a:contains('Im Verband freigeben')" ).attr('id', 'freigabe-verband');
  //setting id for second button (works aswell)
  $( "a:contains('Vorheriger Einsatz')" ).attr('id', 'vorheriger-einsatz');
  
  $( document ).keydown(function(e) {
   if (e.keyCode == 39) {
    //works, id is available, not set by me
     $("#alert_next").click();
  
  } else if (e.keyCode == 38){
    // arrow up
    $("#freigabe-verband").click();
  
  } else if (e.keyCode == 40){
    // arrow down
    $("#vorheriger-einsatz").click();
  
  } 
  return e.returnValue;
  
  });  
}
);

<!DOCTYPE html>
<html>

  <head>
    <script data-require="jquery@2.1.4" data-semver="2.1.4" src="https://code.jquery.com/jquery-2.1.4.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body>
    <h1>Hello Plunker!</h1>
    <a href="#" onclick="alert('a');">Im Verband freigeben</a><br>
    <a href="#" onclick="alert('b');">Vorheriger Einsatz</a>
  </body>

</html>

回答3:

Try this example:

$(document).find("#vorheriger-einsatz").click();

You're adding to the DOM after the fact so unless you search the dom again it won't be found

来源：https://stackoverflow.com/questions/34315820/jquery-script-adding-id-and-using-it-doesnt-work

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