Adding ALSA module in Python in Linux

Question

$links = $li->getElementsByTagName('a');

foreach ($links as $link)
{
$link_text = $link->nodeValue;
$image = $dom->createElement('img');
$image->setAttribute('src', 'some target');
$image->setAttribute('alt', $link_text);

$link->nodeValue($image); // doesnt work
}

How do I replace link's nodevalue with the new one? (using domdocument)

There is actually one link inside li, but I'm not sure how to get it without foreach.

Solution 1

It doesn't need to python setup.py build , When you download by hand a module you should do it, however if you use install pip system , you don't need to use the given command.

in debian-base systems you can see the following formula:

python-modulename #python2 
python3-modulename #python3

But if you didn't find in debian repository, you can download by or without dowunlowd just use:

pip install yourmoudle
pip3 install yourmodule

before pip system programmers used easy_install.

Solution 2

python-pyalsa is available in Debian for wheezy/testing/unstable. You don't need to build/install from source.

Comments

[Felix Kling]

nodeValue is actually not defined for elements. Don't know how PHP handles this though.

[Ignacio Vazquez-Abrams]

You don't need to do that. Read INSTALL again.

[Alen Milakovic]

"I wanted to install ALSA inside my python". Sorry, I don't understand what this means. Can you clarify/elaborate?

[Jasper]

Catchable fatal error: Object of class DOMElement could not be converted to string

[Jasper]

Catchable fatal error: Object of class DOMElement could not be converted to string

[Jasper]

Catchable fatal error: Object of class DOMElement could not be converted to string

[Casey Kinsey]

I was just pointing out that it was a property, and not a method. The documentation should be able to shed some light on how to manipulate the library to work properly. Also, this error is coming up because you are apparently trying to assign an object ($image) to the property. It accepts a string only. You're probably wanting to insert an element, not alter the nodeValue.

[Jasper]

for saveHtml- Warning: DOMDocument::saveHTML() expects exactly 0 parameters, 1 given

[Jasper]

I have to insert and replace nodeValue, there is a text, it should be replaced with the image. Have looked into docs, didnt find

[cwallenpoole]

That is definitely a bizarre case and it goes directly against both experience and the docs, I would see if you have some sort of bizarre config issue if possible. You might also try saveXML. It should provide the same output in this case.

[cwallenpoole]

Either way, the correct way to do this is by using appendChild anyway.

[Jasper]

saveXML - Fatal error: Call to a member function saveXML() on a non-object

[Casey Kinsey]

And did you try $link->appendChild( $image ) ? That's the proper way to append a node to the li.

[Jasper]

ok, if we appendchild, how do we remove the text node inside a link?

[Casey Kinsey]

You may need to ammend that code to read $image->saveHTML(). OP, when you say it "doesn't work" what do you mean? Is there an error, or is the change not reflected in the document? Changes to the DomDocument object aren't reflected until you call saveHTML or saveXML and output the result.

[cwallenpoole]

@Steve There are "removeChild" and "replaceChild" methods and you can modify the textContent property. It is all found here.

[Andrew Jessop]

I had the same problem on Ubuntu 14.04. To answer the original question, you also have to install the Python headers: sudo apt-get install libpython2.7-dev