when checkbox is unchecked it passes null value instead of 0

kaushik guru

i am using a check box to validate the input given by user. the view is as follows




    @if(Model.Is_Prefix_Checked == 1)
    {
        
        
            
        
    
    }
    else
    {
        
        
                
        
    
    }
    Prefix

When the check box is unchecked it passes null instead of 0

in my model i as follows

public int? isprefixchecked {get; set;}

Kindly help

3 Replies

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Rijwan Ansari3y ago

Select your checkbox with Id reference.

Example:

const checkbox = document.getElementById('Is_Prefix_Checked')
checkbox.addEventListener('change', (event) => {
  var value = this.checked ? 1 : 0;
    $(this).attr("value", value);
})

Sachin Singh3y ago

Test this

$('input[type="checkbox"]').change(function(){
    this.value = (Number(this.checked));
});

Naimish Makwana3y ago
Hello Kaushik,

Your model property isprefixchecked is of type int?. which is expecting either an integer value or null. So you need to cast the value to an integer before setting it to the model property
```
$(document).on("click", "[type='checkbox']", function (e) {
    var value = this.checked ? 1 : 0;
    $(this).attr("value", value);
});
```
Thanks

Naimish Makwana