Question

With jQuery how do I count how many fields of my array field[] are not empty ?

Sample of the input field

<input type="file" name="arquivo[]" id="arquivo">

I was trying to make something up using map and get but it is not coming along well:

var total = 0;
var count = $('#arquivo[value!=""]').map(function() { total = total+1; }).get();

But no matter how many fields I have filled it always end up with the value of 1 and if I have no fields filled 0.

Answer 1

You can just find the length of the jQuery object, which returns the number of matched elements:

$('#arquivo[value!=""]').length

But you do know that this will always return 0 or 1? The id property is unique to only one element, so you can’t reuse it multiple times.

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For example:

<div id="foo"></div>
<div id="foo"></div>

When you run:

$('#foo').length;

It returns 1, because only one element should exist with the id of foo.

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Now try this:

<div class="foo"></div>
<div class="foo"></div>

When you run:

$('.foo').length;

It returns 2. Why? Because class can be reused many times.

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What are you trying to do? Can you post a scenario with multiple input fields?