I want to do some pre-server-validation of a form in a Backbone.js model. To do this I need to get the user input from a form into usable data. I found three methods to do this:
var input = $("#inputId").val();
var input = $("form.login").serialize();
var input = $("form.login").serializeArray();
Unfortunately, none of the provide a good reabable and developable JSON object which I require. I already looked through several questions on Stack Overflow, but I found only some extra libraries.
Doesn't Underscore.js, the current jQuery or Backbone.js provide a helper method?
I can't imagine there is no request for such a function.
HTML
<form class="login">
<label for="_user_name">username:</label>
<input type="text" id="_user_name" name="user[name]" value="dev.pus" />
<label for="_user_pass">password:</label>
<input type="password" id="_user_pass" name="user[pass]" value="1234" />
<button type="submit">login</button>
</form>
JavaScript
var formData = $("form.login").serializeObject();
console.log(formData);
Outputs
{
"name": "dev.pus",
"pass": "1234"
}
Backbone.js model
var user = new User(formData);
user.save();
This question is related to
jquery
backbone.js
underscore.js
If you do not care about repetitive form elements with the same name, then you can do:
var data = $("form.login").serializeArray();
var formData = _.object(_.pluck(data, 'name'), _.pluck(data, 'value'));
I am using Underscore.js here.
Here is what I use for this situation as a module (in my formhelper.js):
define(function(){
FormHelper = {};
FormHelper.parseForm = function($form){
var serialized = $form.serializeArray();
var s = '';
var data = {};
for(s in serialized){
data[serialized[s]['name']] = serialized[s]['value']
}
return JSON.stringify(data);
}
return FormHelper;
});
It kind of sucks that I can't seem to find another way to do what I want to do.
This does return this JSON for me:
{"first_name":"John","last_name":"Smith","age":"30"}
Well, here's a handy plugin for it: https://github.com/macek/jquery-serialize-object
The issue for it is:
Moving ahead, on top of core serialization, .serializeObject will support correct serializaton for boolean and number values, resulting valid types for both cases.
Look forward to these in >= 2.1.0
The below code should help you out. :)
//The function is based on http://css-tricks.com/snippets/jquery/serialize-form-to-json/
<script src="//code.jquery.com/jquery-2.1.0.min.js"></script>
<script>
$.fn.serializeObject = function() {
var o = {};
var a = this.serializeArray();
$.each(a, function() {
if (o[this.name]) {
if (!o[this.name].push) {
o[this.name] = [o[this.name]];
}
o[this.name].push(this.value || '');
} else {
o[this.name] = this.value || '';
}
});
return o;
};
$(function() {
$('form.login').on('submit', function(e) {
e.preventDefault();
var formData = $(this).serializeObject();
console.log(formData);
$('.datahere').html(formData);
});
});
</script>
Trying to solve the same problem (validation without getting into complex plugins and libraries), I created jQuery.serializeJSON, that improves serializeArray to support any kind of nested objects.
This plugin got very popular, but in another project I was using Backbone.js, where I would like to write the validation logic in the Backbone.js models. Then I created Backbone.Formwell, which allows you to show the errors returned by the validation method directly in the form.
If you are sending the form with JSON you must remove [] in the sending string. You can do that with the jQuery function serializeObject():
var frm = $(document.myform);
var data = JSON.stringify(frm.serializeObject());
$.fn.serializeObject = function() {
var o = {};
// var a = this.serializeArray();
$(this).find('input[type="hidden"], input[type="text"], input[type="password"], input[type="checkbox"]:checked, input[type="radio"]:checked, select').each(function() {
if ($(this).attr('type') == 'hidden') { //if checkbox is checked do not take the hidden field
var $parent = $(this).parent();
var $chb = $parent.find('input[type="checkbox"][name="' + this.name.replace(/\[/g, '\[').replace(/\]/g, '\]') + '"]');
if ($chb != null) {
if ($chb.prop('checked')) return;
}
}
if (this.name === null || this.name === undefined || this.name === '')
return;
var elemValue = null;
if ($(this).is('select'))
elemValue = $(this).find('option:selected').val();
else elemValue = this.value;
if (o[this.name] !== undefined) {
if (!o[this.name].push) {
o[this.name] = [o[this.name]];
}
o[this.name].push(elemValue || '');
} else {
o[this.name] = elemValue || '';
}
});
return o;
}
Use:
var config = {};
jQuery(form).serializeArray().map(function(item) {
if ( config[item.name] ) {
if ( typeof(config[item.name]) === "string" ) {
config[item.name] = [config[item.name]];
}
config[item.name].push(item.value);
} else {
config[item.name] = item.value;
}
});
You can do this:
function onSubmit( form ){_x000D_
var data = JSON.stringify( $(form).serializeArray() ); // <-----------_x000D_
_x000D_
console.log( data );_x000D_
return false; //don't submit_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<form onsubmit='return onSubmit(this)'>_x000D_
<input name='user' placeholder='user'><br>_x000D_
<input name='password' type='password' placeholder='password'><br>_x000D_
<button type='submit'>Try</button>_x000D_
</form>
_x000D_
see this: http://www.json.org/js.html
Found one possible helper:
https://github.com/theironcook/Backbone.ModelBinder
and for people who don't want to get in contact with forms at all: https://github.com/powmedia/backbone-forms
I will take a closer look at the first link and than give some feedback :)
I know this doesn't meet the helper function requirement, but the way I've done this is using jQuery's $.each() method
var loginForm = $('.login').serializeArray();
var loginFormObject = {};
$.each(loginForm,
function(i, v) {
loginFormObject[v.name] = v.value;
});
Then I can pass loginFormObject to my backend, or you could create a userobject and save() it in backbone as well.
My contribution:
function serializeToJson(serializer){
var _string = '{';
for(var ix in serializer)
{
var row = serializer[ix];
_string += '"' + row.name + '":"' + row.value + '",';
}
var end =_string.length - 1;
_string = _string.substr(0, end);
_string += '}';
console.log('_string: ', _string);
return JSON.parse(_string);
}
var params = $('#frmPreguntas input').serializeArray();
params = serializeToJson(params);
Using Underscore.js:
function serializeForm($form){
return _.object(_.map($form.serializeArray(), function(item){return [item.name, item.value]; }));
}
Here's a function for this use case:
function getFormData($form){
var unindexed_array = $form.serializeArray();
var indexed_array = {};
$.map(unindexed_array, function(n, i){
indexed_array[n['name']] = n['value'];
});
return indexed_array;
}
Usage:
var $form = $("#form_data");
var data = getFormData($form);
I couldn't find an answer that would solve this:
[{name:"Vehicle.Make", value: "Honda"}, {name:"Vehicle.VIN", value: "123"}]
This calls for this object:
{Vehicle: {Make: "Honda", "VIN": "123"}}
So I had to write a serializer of my own that would solve this:
function(formArray){
var obj = {};
$.each(formArray, function(i, pair){
var cObj = obj, pObj, cpName;
$.each(pair.name.split("."), function(i, pName){
pObj = cObj;
cpName = pName;
cObj = cObj[pName] ? cObj[pName] : (cObj[pName] = {});
});
pObj[cpName] = pair.value;
});
return obj;
}
Maybe it will help somebody.
Using jQuery and avoiding serializeArray
, the following code serializes and sends the form data in JSON format:
$("#commentsForm").submit(function(event){
var formJqObj = $("#commentsForm");
var formDataObj = {};
(function(){
formJqObj.find(":input").not("[type='submit']").not("[type='reset']").each(function(){
var thisInput = $(this);
formDataObj[thisInput.attr("name")] = thisInput.val();
});
})();
$.ajax({
type: "POST",
url: YOUR_URL_HERE,
data: JSON.stringify(formDataObj),
contentType: "application/json"
})
.done(function(data, textStatus, jqXHR){
console.log("Ajax completed: " + data);
})
.fail(function(jqXHR, textStatus, errorThrown){
console.log("Ajax problem: " + textStatus + ". " + errorThrown);
});
event.preventDefault();
});
Source: Stackoverflow.com