javascript - Remove empty values before form submit jquery - Stack Overflow

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I have form with several text inputs.

When user clicks submit on this form - text input field values being serialized and bee parameters of GET request like this

?param1+=26482&param2=

I need to check: if parameter has no value then remove it. So only parameters with values will be appended to GET request.

How it should be done?

My submit function

$("body").on('click','#form_submit_button', function(e){
    var form = $('#filter_form');
    change_url('?'+form.serialize());
});

function change_url(link)
{
    var IE = IE || 0;

    if (IE == 0) {
        var stateObj = { foo: "bar" };
        history.pushState(stateObj, "page 2", link);
    } else {
        location.href = link;
    }
}

I have form with several text inputs.

When user clicks submit on this form - text input field values being serialized and bee parameters of GET request like this

?param1+=26482&param2=

I need to check: if parameter has no value then remove it. So only parameters with values will be appended to GET request.

How it should be done?

My submit function

$("body").on('click','#form_submit_button', function(e){
    var form = $('#filter_form');
    change_url('?'+form.serialize());
});

function change_url(link)
{
    var IE = IE || 0;

    if (IE == 0) {
        var stateObj = { foo: "bar" };
        history.pushState(stateObj, "page 2", link);
    } else {
        location.href = link;
    }
}

• javascript
• jquery
• forms

Share Improve this question Follow edited Oct 20, 2014 at 12:53 nikodz 72755 silver badges1313 bronze badges asked Oct 20, 2014 at 12:37 micgeronimomicgeronimo 2,14955 gold badges2424 silver badges4545 bronze badges

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3 Answers 3

Sorted by: Reset to default 4

You can use the following js which filter your form including only inputs with a value.

http://jsfiddle/63ux5ap9/

  $(document).ready(function () {
        $('#filter_form').submit(function () {
            var text = $(this).find(":input").filter(function () {
                return $.trim(this.value).length > 0
            }).serialize();
            console.log('text: ', text);
            return false;
        });
    });

jQuery $.fn.serialize is a bination of $.param and $.fn.serializeArray methods:

jQuery.fn.serialize = function () {
    return jQuery.param(this.serializeArray());
}

It means that in order to achiever what you are after you can use the same approach and perform additional filtering of the resulting array returned by serializeArray:

var form = $('#filter_form'),
    params = $.param(form.serializeArray().filter(function(el) {
        return $.trim(el.value);
    }));

change_url('?' + params);

What do you need is:

var i = str.lastIndexOf("&");

So

if(str.length <= str.lastIndexOf("=")) {
   var i = str.lastIndexOf("&");
   str = str.substring(0, i); 
}

By the way, I would remove problem from radix!

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