javascript from ajax with :eval question

[Vlad]

I am calling ajax function with :eval and setting up some javascript [from the controller] to be executed [as per :eval option js is executed in the end], something like this: 

    result = "$('#DebugID').append('<p>"

    result += "CONTENT"

    result += "</p>');"

    return result

Now, this works, and it displays <p>CONTENT</p> at the right place. 

But here is a catch: instead of "CONTENT" I want it to display an object, for example Rows object which is returned by db.select. 

In other words, whatever comes out when {{=rows}} is specified in html view, I want to send via javascript. 

Obviously, the following 2 options are grossly incorrect and don't work, for obvious reasons:  

   result += XML(rows)

   result += "={{rows}}"

So, how do I make the stuff display properly as passed over vial javascript? 

 

[villas]

Maybe this:  ASSIGNJS

http://www.web2py.com/books/default/chapter/29/05/the-views#ASSIGNJS

[Vlad]

ALMOST :)

    result += ASSIGNJS(cart=cart)

    result += "$('#Debug_Discount').append('<div>'+cart+'</div>');"

this comes out as [object Object]

But generated Javascript (as far as the object's content is concerned) seems right - I think I am missing the final touch, some javascript trick that would print it fully.

Here is actual Javascript generated:

$('#Debug_Discount').append('<hr/>');

var cart = [{"id": 125, "cart": 40, "product": 161, "quantity": 1, "price": 3000, "imported": null, "is_active": true, "created_on": "2019-05-17 15:47:52", "created_by": 1, "modified_on": "2019-05-17 15:47:52", "modified_by": 1}];

$('#Debug_Discount').append('<div>'+cart+'</div>');. 

Good ideas on final touch? 

[Junior Phanter]

resultado + = {{=json.dumps(DIV().xml())}}

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[villas]

Not sure what you are trying to do, work in the controller or view, or why you are trying to append with JS.

Maybe you could learn to use the web2py helpers...

e.g. controller

def example():

    cart = db(db.cart).select().as_list()

    mydiv = DIV(cart, _id='Debug_Discount' )

    return dict(mydiv=mydiv)

view  example.html

    {{=mydiv}}

OR

e.g. controller

def example():

    cart = db(db.cart).select()

    mydiv = DIV(_id='Debug_Discount' )

    return dict(mydiv=mydiv, rows=rows)

view  example.html

    {{=mydiv}}

    <hr />

    <script>

        {{ =ASSIGNJS(cart) }}

        $('#Debug_Discount').html(cart);

    </script>

Not sure whether any of the above will work or help,  but just experiment until you learn how best to mix it all together.

[Eliezer (Vlad) Tseytkin]

Could you please clarify:

You mentioned {{=json.dumps()}} which looks like code executed in Python. But in "result+=" I am constructing an expression which is actually executed in JavaScript. Did you mistype or I'm missing something? 

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[Eliezer (Vlad) Tseytkin]

I am very familiar with controllers/views/helpers the way you just specified, but it doesn't help me because here is my context:

I am using ajax function from JavaScript, as a response to a certain event on the page. This ajax is called with :eval option which allows me to construct actual JavaScript string to be executed (the one that in my example represented by result+=...); the reason I can't use a regular JS ajax call which replaces html element is because I specifically need to update multiple targets, so :eval is my only option). I can't use regular {{...}} embeds either, because I can't reload the page - need to update multiple html elements on the fly, in ajax mode. 

That's why my only option seems to be constructing JavaScript which executes the necessary updates on the page as a sequel to JavaScript ajax(:eval) call. This is exactly how I ended up constructing JavaScript in my controller function and the need to mix in some web2py objects in it. 

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[Junior Phanter]

# controller return javascript(Jquery) to eval

def echo:

    import json

    return "$('#target').html(%s)" %(json.dumps(DIV("Hello", STRONG("world"), "<tag_of_devil>Escape this?</tag_of_devil>").xml()))

#view

<div id="target"></div>

<button id="your_button">get from echo</button>

<script>

$("#your_button").on("click", function(){

    url_ajax = "{{=URL("your_controler", "echo")}}"

    ajax(url_ajax, [], ":eval"))

})

</script>

 

    

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[Eliezer (Vlad) Tseytkin]

Aaahhh got it 

Thank you very much!! 

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