python - Chameleon templates for javascript files?

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python - Chameleon templates for javascript files?

posted Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

python - Chameleon templates for javascript files?

I am developing a simple pyramid application where I am using JQuery to do AJAX requests. I have until now had my javascript code within my chameleon templates. Now I want to extract my javascript into another location (e.g. as static resources).

My problem is that I find my javascript code relies on dynamically generated content like so:

$.post("${request.route_url('my_view')}",{'data': 'some data'}, function(html){
    $("#destination").html(html);
});

The dynamic element being:

"${request.route_url('my_view')}"

Which is calling the route_url method of the request object within the template.

Is there a recognised pattern for separating such javascript files into their own templates and providing routes and views for them or do I simply keep my javascript in my page template?

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1 Reply

深蓝 · Answer 1 · 2021-10-23T19:30:51+0000

Yes; you generally put context-specific information like expanded routes into the templates and access this information from your (static) JavaScript libraries.

Including the context info can be done in various ways, depending on taste:

You could use a data attribute on a tag in your generated HTML:
```
<body data-viewurl="http://www.example.com/route/to/view">
    ...
</body>
```
which you then, in your static JS code load with the jQuery .data() function:
```
var viewurl = $('body').data('viewurl');
```
Use a made-up LINK tag relationship to include links in the document head:
```
<head>
    <link rel="ajax-datasource" id="viewurl"
          href="http://www.example.com/route/to/view" />
    ...
</head>
```
which can be retrieved using $('link#viewurl').attr('href'), or $('link[rel=ajax-datasource]').attr('href'). This only really works for URL information.

Generate JS variables straight in your template, to be referenced from your static code:

<head>
    ...
    <script type="text/javascript">
       window.contextVariables = {
           viewurl = "http://www.example.com/route/to/view",
           ...
       };
    </script>
</head>

and these variables are referable directly with contextVariables.viewurl.

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