JQuery operation & lt; input type = & quot; checkbox & quot; & gt;, jquerycheckbox

JQuery operation <input type = "checkbox">, jquerycheckbox

<Input type = "checkbox">:

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The National Team that qualify for the 2012 European Cup "death group" is: <br><input Type = "checkbox" name = "nation" value = "Germany"> Germany<input Type = "checkbox" name = "nation" value = "Denmark"> Denmark<input Type = "checkbox" name = "nation" value = "Holland"> Netherlands<input Type = "checkbox" name = "nation" value = "Portugal"> Portugal

1. The first and second place in the group can only be selected.

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var len = $("input[name='nation']:checked").length;if(len==0) {     alert("Select the qualifying National Team! ");     return false;}else if(len<2) {     alert("Select two national teams! ");     return false;}else if(len>2) {     alert("Only two national teams can be selected! ");     return false;}else {     return true;}

2. Traverse selected national teams.

123	$("input[name='nation']:checked").each(function(){    alert("Selected national team :"+$(this).val());});

3. Cancel all selected national teams.

1	$("input[name='nation']:checked").attr("checked",false);

4. Select two national teams.

12	$("input[name='nation'][value='Germany']").attr("checked",true);$("input[name='nation'][value='Holland']").attr("checked",true);

5. You are not allowed to select the National Team.

1	$("input[name='nation']").attr("disabled",true);

6. Select the National Team.

1	$("input[name='nation']").attr("disabled",false);

7. Select the national team with an even or odd number of indexes (the index starts from 0 ).

1234	// Select the national team with an even Index$("input[name='nation']:even").attr("checked",true);// Select the national team with an odd Index$("input[name='nation']:odd").attr("checked",true);