How to determine whether a radio button is selected in jquery

The jquery method to determine whether a radio button is selected: First, when loading the page, obtain the id through "$(this).attr("id");"; then obtain the id when the button is clicked and Just make the judgment.

The operating environment of this tutorial: windows7 system, jquery1.2.6 version, DELL G3 computer.

Recommended: jquery video tutorial

Jquery method to determine whether the radio button radio is selected

The html code is as follows:

<input type="radio" id="d1" name="ra" value="a" checked="checked" />
<input type="radio" id="d2" name="ra" value="b" />
<input type="radio" id="d3" name="ra" value="c" />

1. Get the id when loading the page

$("input[type='radio']").each(function(){
  var id= $(this).attr("id");
  if($("#"+id).attr("checked")=="checked"){
   var fs=$("#"+id).val();
  }
});
var s1 = $(".aa:checked").val(); // .aa 为class
var s2 = $("input[name='ra']:checked").val();

2. Get the id

$(function(){
  $("input[type='radio']").click(function(){
    var id= $(this).attr("id");
    alert(id);
  });
});

when you click the button

The above is the detailed content of How to determine whether a radio button is selected in jquery. For more information, please follow other related articles on the PHP Chinese website!