•  01-07-2022
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Question

I have this html snippet. I want parse that snippet and emit html without javascript tags 

<html>
    <body>
        <div class="content">lorem ipsum</div>
        <script  src="/js/jquery.js" type="text/javascript"></script>
        <script src="/js/bootstrap.min.js" type="text/javascript"></script>
    </body>
</html>

become this

<html>
    <body>
        <div class="content">lorem ipsum</div>
    </body>
</html>

I couldn't found enlive helper function to remove tags.

I have found the solution thanks for the example. So I write this code and the js disappeared 

(html/deftemplate template-about "../resources/public/build/about/index.html"
    []
    [:script] (fn js-clear [& args] nil)
)
Was it helpful?

Solution

My usual approach when I need to conditionally remove some tags of the rendered page is to use a nil returning function.

For instance

(html/defsnippet upgrade-plan "page_templates/upgrade-plan.html" [:#upgradePlanSection]
  [pending-invoice ... ]
  ...
  [:#delayedPlanWarning] #(when pending-invoice
                            (html/at %
                                     [:#delayedPlanWarning] (html/remove-attr :style)
                                     [:.messagesText] (html/html-content (tower/t :plans/pending-invoice 
                                                                                (:id pending-invoice)))))
  ...

In that particular case if pending-invoice is nil the delayedPlanWarning element is removed from the rendered html since the function returns nil.

OTHER TIPS

If you don't mind the extra parsing and emitting, the following would do nicely:

(def orig (html-resource (java.io.StringReader. "<html>
<body>
    <div class=\"content\">lorem ipsum</div>
    <script  src=\"/js/jquery.js\" type=\"text/javascript\"></script>
    <script src=\"/js/bootstrap.min.js\" type=\"text/javascript\"></script>
</body>
</html>")))
(def stripped (transform orig [(keyword "script")] (substitute "")))
(apply str (emit* stripped))

When removing whole tags, you only need to use nil as your transformation.

(deftemplate tester1
             (java.io.StringReader. "<html><body><div class=\"content\">...")
             []
             [:script] nil)

(template1)

In your case, you would replace the StringReader with the resource you are using.

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