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jquery Gets the value of the checkbox and determines whether it is not selected

Source: Internet
Author: User
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Core code

The code is as follows Copy Code

if ($ ("Input[name= ' checkbox ']:checkbox:checked '). length>0) {
box = ';
$ ("Input[name= ' checkbox ']:checkbox:checked"). each (function () {
Box + = $ (this). Val () + ', ';
})
}else{
Alert (' no choice ');
return false;
}

Cases

The code is as follows Copy Code

<input type= "checkbox" name= "Sex" value= "male"/> Male
<input type= "checkbox" name= "Sex" value= "female"/> Female
<input type= "checkbox" name= "Sex" value= "Unknow"/>unknow
<input type= "button" value= "Showselectedvalue" id= "Showvalue"/>
$ (function () {
$ ("#showValue"). Click (function () {
$ (": checkbox[name= ' Sex '][checked]"). each (function () {
Alert ($ (this). Val ());
});
})
});

Full instance

The code is as follows Copy Code

<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "HTTP://WWW.W3.ORG/TR/HTML4/LOOSE.DTD" >
<title>js gets the value of the check box selected </title>
<body>
<input type= "checkbox" name= "Test" value= "0"/>0&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "1"/>1&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "2"/>2&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "3"/>3&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "4"/>4&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "5"/>5&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "6"/>6&nbsp;&nbsp;
<input type= "checkbox" name= "Test" value= "7"/>7&nbsp;&nbsp;
<input type= "button" onclick= "Chk ()" value= "Submit"/>
</body>


<mce:script type= "Text/javascript" ><!--
 
Function chk () { 
  var obj= Document.getelementsbyname (' test '); //Select all Name= "' Test '" objects, return array  
 ///Fetch to object array, we'll loop to see if it's selected  
  var s= '; 
  for (var i=0; i<obj.length; i++) { 
    if (obj[i) . Checked) s+=obj[i].value+ ', '; //If selected, add value to variable s  
 } 
 // So now to detect the value of S, you know the value of the selected check box  
  alert (s== '? ') You have not chosen any content yet! ': s]; 
} 
 
Function jqchk () { //jquery get check box value  
  var chk_value =[];  ;
  $ (' input[name= ' Test ']:checked '). each (function () { 
   Chk_value.push ($ (this). Val ());  
 }); 
  alert (chk_value.length==0? ') You have not chosen any content yet! ': chk_value); 
} 

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