Passing python string to javascript

[José Eloy]

Hello!

How can I pass a python string to javascript? I know how to pass an integer variable to javascript.

Example:

def pass_variable():
    variable = 25
    return dict(variable=variable)

In the view:
<script type="text/javascript">
   var v={{=variable}};
   console.log(v);
</script>

If I pass a integer variable, javascript receive it well, but if I pass a string, javascript doesn't recognize it.

Now, let's assume that we use variable = "HOLA"

I get the error: (using Firefox console)
---------------------------------------------------
ReferenceError: HOLA is not defined
var v = HOLA;
---------------------------------------------------
What am I doing wrong?

Regards.

[lillian]

Jose,

You are missing quotes:

var v='{{=variable}}';

In your code js thinks HOLA is an object.  If you don't want to use quotes on the js side you need to use extra ones in python and prevent them from being escaped:

variable = XML("'HOLA'")

This will get you 'HOLA' in js.  If you don't use the XML() handler you will get &#x27;HOLA&#x27;

That's my assessment of the situation anyways.  Better answers are probably out there ;-)

lillian

[Anthony]

You need to use quotes:

var v = '{{=variable}}';

After the template is processed, it will look like:

var v = 'HOLA';

Anthony

[Manuele Pesenti]

Il 29/01/15 00:04, José Eloy ha scritto:

Hello!

How can I pass a python string to javascript? I know how to pass an integer variable to javascript.

Example:

def pass_variable():
    variable = 25
    return dict(variable=variable)

In the view:
<script type="text/javascript">
   var v={{=variable}};
   console.log(v);
</script>

just try this:

<script type="text/javascript">
   var v="{{=variable}}";
   console.log(v);
</script>

cheers

    M.

If I pass a integer variable, javascript receive it well, but if I pass a string, javascript doesn't recognize it.

Now, let's assume that we use variable = "HOLA"

I get the error: (using Firefox console)
---------------------------------------------------
ReferenceError: HOLA is not defined
var v = HOLA;
---------------------------------------------------
What am I doing wrong?

Regards.

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[Leonel Câmara]

There's also the rarely used ASSIGNJS helper which you can use for this.

[Anthony]

We should probably document that.

[Massimo Di Pierro]

Actually

{{=ASSIGNJS(v = variable)}}

or, equivalent,

var v = {{=XML(json.dumps(variable))}}; 

is the right thing to do. Not in the manual but is in 2.9.11 and beyond.

[José Eloy]

Thanks guys for your answer.

Making var v="{{=variable}}" was the solution.

I didn't know the ASSIGNJS helper. Is not in the manual. It would be great if is included.

Regards.

[Anthony]

Yes, this is the best approach because it automatically handles quoting strings (but leaving numbers unquoted), so you don't have to worry about the data type.

Anthony