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Get the name of instance as string in Javascript

Im working with Three.js and javascript.
When my code executes this:
console.log(this.scene.children[1])
I get this in my console of Chrome:
How can I get the name of the object ('WidgetsRuler') as a string?
I dont see any attribute that saves this information.

Okay I Solved it using:
console.log(this.scene.children[1].constructor.name)

I believe you should be able to use prototype to achieve this:
Object.prototype.toString
eg:
Console.Log(this.scene.children[1].prototype.toString())
Failing that, you can try constructor:
console.log(this.scene.children[1].constructor.name)

Check passed data with a view is not empty in laravel

I am using laravel 4 and I want to pass a data with a view.
I have used this code in a controller.
$view = View::make('settings.editEvent');
$view->bounderyData = $bounderyData;
And I want to check whether this data exists or not in the view settings/editEvent.blade.php
Tried using this..
<script>
if('{{$bounderyData.length()}}'!=null)
console.log('exists');
</script>
Error :
Array to string conversion error
How can I check the existence ?

Do not assign the data to the View variable, but instead, pass it along using with as Laravel requests you to use:
$view = View::make('settings.editEvent')
->with('bounderyData', $bouderyData);

Actually both of the snippets work the same way. You can either pass data using with() method or by assigning it to view as property. So it doesn't really matter. But it looks like you are using some weird syntax because you are trying to access method length() using dot syntax inside Blade echo statement. Try:
if({{count($bounderyData)}}!=null)
console.log('exists');
or something similar. Remember that everything inside {{}} is going to be echo'ed by PHP. So if you have some sort of array there you may either want to count number of elements or maybe cast it to JSON and then decode it inside Javascript. If you still have problem, let us know what is the issue.

Knockout - How to recreate a JSON object from modified form [duplicate]

I have a JSON object that I used to create a form. This JSON object is parsed by KnockoutJS.
Now, when I modify the form, I want the JSON object to be updated according to the modifications made in the form. The thing is that I don't know in advance how the form will be like but I know in the JSON Object which fields need to be updated.
I really don't know what is the best way to procede. I know that I could reconstruct the JSON Object each time something has changed but this seems like a bad idea and a tedious process.
Is there a simple way to map each JSON Object field to form items in KnockoutJS ?
Here's a JSFiddle of what I'm currently doing:http://goo.gl/ZBaV7
Update :
I realized something interesting with this line:
<input type="text" data-bind="value: $data.value, attr : { disabled: $data.disabled }" />
I'm accessing the value directly from the array via ($data.value). Is there a way in the html to say to knockout to bind to this particular attribute in the array. I know that if the array would get reordered everything would get messed up but since I know that the only thing that can changed is this property I'm ready to take this risk ?
In other words, is there a way to manually say that when this value changes to change it in the array such as
data-bind="onChange: $data.value = this.value"

Is there a simple way to map each JSON Object field to form items in
KnockoutJS ?
Yes, If I understand what you want to do correctly. As of now, the values in your view model are not observables and won't be updated automatically as the form values change. There is a plugin to handle this mapping.
http://knockoutjs.com/documentation/plugins-mapping.html
Example: Using ko.mapping
To create a view model via the mapping plugin, replace the creation of
viewModel in the code above with the ko.mapping.fromJS function:
var viewModel = ko.mapping.fromJS(data);
This automatically creates observable properties for each of the
properties on data. Then, every time you receive new data from the
server, you can update all the properties on viewModel in one step by
calling the ko.mapping.fromJS function again:
ko.mapping.fromJS(data, viewModel);
Hopefully this helps.

If your Knockout ViewModel matches your form, you could just use the built in ks.toJSON()
http://knockoutjs.com/documentation/json-data.html
A better option, especially if your form is large or complex, is to use either the mapping or viewmodel plug-ins
http://knockoutjs.com/documentation/plugins-mapping.html
http://coderenaissance.github.io/knockout.viewmodel/

The simplest way to turn your json model into a usable knockout model is with the mapping plugin.
Alternatively, you can manually copy fields from your json model into ko.observable members of your view model, which give you more control and lets you choose to skip read-only properties.

Variable expression into javascript without using th:inline

I searched first but I found confusing answers since I'm new to Thymeleaf and amateurish at best at javascript.
I just want to know how to pass variable expressions into javascript functions, sort of like in JSP:
Button
Of course, this fails with Thymeleaf and passes the string ${contact.id} instead of its value, so how could I get the value of the variable expression instead?
The reason I want it this way is because it depends on the row which is being iterated by th:each.
If there's no other way except to use th:inline, then what's the best approach considering the above statement?

This one worked:
th:onclick="'javascript:getContactId(\'' + ${contact.id} + '\');'"
Thanks goes out to the thymeleaf forum:
http://forum.thymeleaf.org/variable-expression-into-javascript-without-using-th-inline-td4025534.html

In Thymeleaf version 2.1, I have not been able to get the accepted answer to work. I did find some guidance from a Twitter post from Thymeleaf. Rather than using th:onclick, you use th:attr and specify the onclick attribute therein.
th:attr="onclick='javascript:getContactId(\'' + ${contact.id} + '\');'"

You can not put javascript variables into onclick or other DOM attributes. The value of onclick or any other DOM attribute should be a constant string.
However, you can dynamically modify value of onclick attribute from javascript, like this:
yourDomElement.onclick = anyVariable;

You can do this like:
th:onclick="'javascript:getContactId(\'' + ${contact.id} + '\');'"

A more generic approach, if you need in JS something that isn't passed as a event handler parameter:
th:attr="data-myValueFromThymeleaf=${contact.id}"
Any attribute whose name is starting with data- is ignored by all browsers. So it won't affect the UI and you can easily read the value in javascript.
I prefer this because it's not ideal to put javascript code in html (see unobtrusive javascript)

I have asked the Thymeleaf project on twitter, and their answer is:
You can use both the "+" operator or literal substitutions. For example: <a th:href="|javascript:change('start','${taskId}')|">
For more info: https://www.thymeleaf.org/doc/articles/standarddialect5minutes.html
I have tried, and it works~

How to access rails variables within Javascript code?

I am using Rails 3.0.5
I have a javascript code that uses jQuery dropdown checklist and I would like to have the checkboxes displaying which item is checked already and which is not, when using my form in the 'Edit' action of my belongings controller.
Basically, it can work like this in Javascript:
$('element').val([1,3,4]);
$('element').dropdownchecklist();
Let us say that in my controller, edit action, I have a instance variable called #selected_items that contains the items that are selected (here: #selected_items = [1,3,4]) and I would like to use the value of this instance variables into my Javascript code, how could I proceed ? How could I access the value of this instance variable in a .js file ?
Many thanks for your answer !

Just write the javascript in your view, and at the appropriate place, print the #selected_items array as json:
app/views/*/*.html.erb
<script>
$('element').val(<%= #selected_items.to_json %>);
$('element').dropdownchecklist();
</script>
You can also use the Gon gem if to_json cannot serialize more complicated objects.

A better and a clean/neat way of handling such requirements is
1.Don't create javascript inside the views not as per the rails
best practices
2.Handle it this way
In your app/views/*/*.html.erb
where you are having the instance variable like (#selected_items) assign it into the options within the helpers something like :sel => #selected_items
In your javascript
<script>
$('element').attr('sel');
$('element').dropdownchecklist();
</script>
I hope it helps!