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Getting the SVG document(contentDocument) using javascript inside the Object tag returns null

  • 9 bhfreagra
  • 1 leis an bhfadhb seo
  • 2449 views
  • Freagra is déanaí ó Zaak

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The following code work in Firefox v54, but stopped working on Firefox v68.4.1 (possibly earlier version as well).

index.html: <body>

<object type="image/svg+xml" data="test.svg", id="test_svg_id">

   Your browser doesn't support SVG
</object>

<script type="text/javascript" src="test.js"></script>

</body>

javascript: function init() {

 console.log("init()");

// Get the overall SVG defined in the Index HMTL page var svg_object = document.getElementById("test_svg_id");

// Get the SVG document inside the Object tag var svg_document = svg_object.contentDocument; }

Any idea why contentDocument is always null?

Réiteach roghnaithe

Zaak said

I am not using a server. I am directly opening the index.html. Is this a security issue that has been fixed in latest version of Firefox?

Oh, ok. That is the issue then. This is not supposed to work if you're just using file://. I guess it was probably added. It won't affect you if you actually publish the project though.

You can serve up the files locally with a variety of solutions. This one looks good if you are using node: https://github.com/http-party/http-server

I usually use python, so I run "python -m http.server" in the directory where all my files are. There are many solutions to serve up your files easily. I would highly recommend this as there are many more things that simply won't work when you open the html file directly.

Read this answer in context 👍 1

All Replies (9)

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I believe either svg_object.innerHTML or svg_object.innerText should give you the output you are looking for.

Athraithe ag Matthew Thomas ar

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I am trying to use interactive SVG and the contentDocument would give me access to all the object I can manipulate. I think something has been changed in later version of Firefox.

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The contentDocument property on frames now returns null if the caller doesn’t subsume the document. This change affects the contentDocument property on the <frame>, <iframe> and <object> elements as well as the getSVGDocument method on the <embed>, <iframe> and <object> elements.

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I am new to javascripts. Can you please give me an example?

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Oh, I get it. Of course, you want to access the external file and not the "Your browser doesn't support SVG" text...

You are still on an old version of the browser.

Do you have this example hosted somewhere that we can take a look at? This object link is not going to work if you open the html file directly (i.e. with file://). Are you serving this up on a local server?

Athraithe ag Matthew Thomas ar

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I am not using a server. I am directly opening the index.html. Is this a security issue that has been fixed in latest version of Firefox?

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Réiteach Roghnaithe

Zaak said

I am not using a server. I am directly opening the index.html. Is this a security issue that has been fixed in latest version of Firefox?

Oh, ok. That is the issue then. This is not supposed to work if you're just using file://. I guess it was probably added. It won't affect you if you actually publish the project though.

You can serve up the files locally with a variety of solutions. This one looks good if you are using node: https://github.com/http-party/http-server

I usually use python, so I run "python -m http.server" in the directory where all my files are. There are many solutions to serve up your files easily. I would highly recommend this as there are many more things that simply won't work when you open the html file directly.

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Thank you for your help.

I'll update you tomorrow if this solves my problems.

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I can confirm that directly opening the index.html in a web browser (using file://) no longer work.

As per Mathew's suggestion, I used local webserver by following method: 1. Ensure python is installed 2. Open Command prompt 3. Change directory to location of index.html in the Command prompt 4. Typing "python -m http.server" to start the server 5. Type "localhost:8000" in the Firefox web browser