如何检查复选框是否被选中？

Question

Here is something I have now: I've got a checkbox, which I need to verify whether it is selected.

<input type="checkbox" name="person_info_check" value="0" &nbps>Read and agree!</input>

But when I tried to use the way I had searched through the Internet, I found I couldn't catch the checkbox and thus verify.

This is how I grab the checkbox:

        if($('#person_info_check').is(':checked')){
            if(confirm("Are you sure to submit?")){
                return true;
            }
            else return false;
        }
        else{
            alert("Please read the file and agree the statement!");
            return false;
        }

And I've also tried this:

        var checkbox = document.getElementsByName("person_info_check");

        if(checkbox[0].checked==false){
            alert("Please read the file and agree the statement!");
            return false;
        }

Answer 1

You are using $('#person_info_check') that is actually a jQuery ID Selected while in your HTML you specified the name="person_info_check" so your element is not getting selected.

Try specifying the id="person_info_check" in your checkbox element. Most of the jQuery code should work.

Or you can use the JQuery name selector.

$("input[value='person_info_check]")

Answer 2

The problem is that person_info_check is not the id of your input but the name attribute. You should use this: $("input[name='person_info_check']").is(':checked');

Answer 3

There are major errors in your code such as:

1. Input type checkbox does not require any value tag
2. Input type does not require to have a closing tag
3. Input type does not entertain the HTML text; it only can have value or checked status according to the tag type.

More details of the input tag can be found here . An example of code is as follows:

 var checkbox = document.getElementById("che"); if (checkbox.checked == true) { alert('I am checked') } 

 <input type="checkbox" name="person_info_check" id='che' checked/> <label for='che'>I am checkbox</label>