CODEWITHSUNDEEP
jquery
Saint Robson
Saint Robson

Reputation: 5525

jQuery Change Null Into Zero With IF Failed

I have this jquery loop :

var total_value = 0;
$("select.dropdown").each(function() {

    if (($(this).val()) = null) {
        $(this).val() = 0;
    }

    alert ($(this).val());
    total_value = parseInt(total_value) + parseInt($(this).val());
});

some of $(this).val() still have null value because user haven't select yet. but I need to sum all value. so, I need to convert null into 0 in order to be calculated.

but I can't alert it because there's conditional IF there. what's wrong with that IF?

Upvotes: 0

Views: 3696

Answers (3)

Milind Anantwar
Milind Anantwar

Reputation: 82231

If this is just for sake of calculating the sum, then you need to change the total_value calculation to:

total_value += $(this).val() == null ? 0: parseInt($(this).val(),10);

Full Snippet:

var total_value = 0;
$("select.dropdown").each(function() {
   total_value += $(this).val() == null ? 0: parseInt($(this).val(),10);
});

Upvotes: 2

Rion Williams
Rion Williams

Reputation: 76547

You are currently using the assignment operator = for equality instead of one of the the equality operators == or === in your if-statement.

Additionally, the val() function actually expects a parameter for the value you wish to set as seen below :

// This will compare your value to null
if ($(this).val() == null) {
    // If it is null, it will set it to 0
    $(this).val(0);
}

Upvotes: 1

Dhara Parmar
Dhara Parmar

Reputation: 8101

It should be:

if ($(this).val() == null) {
    $(this).val(0);
}

Upvotes: 1

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