Get the list of attributes of a HTML string using Javascript

Question

How can I get the list of attributes of an HTML string using Javascript? Here's my code so far.

function traverse_test(){
    var root=document.getElementById('arbre0').childNodes;
    for(var i=0;i<root.length;i++){
        var lis = root[i];
        if (lis =='[object HTMLUListElement]') {
            for (var member in lis) {
                if (typeof lis[member] == "string") {
                    var assertion = lis[member];
                    var resultat = assertion.search(/..Bookmarks/);
                    if (resultat != -1) {
                        output.innerHTML+= lis[member];
                        // Here I'd like to have the list of lis[member] attributes
                        for(var attr in lis[member].attributes) {
                            output.innerHTML+=lis[member].attributes[attr].name + "=\""+ lis[member].attributes[attr].value + "\"";
                        }
                        break;
                    }
                }
            }
        }
    }
}

Stumpy

You mean any arbitrary string of HTML? like parseHTMLAndGetAttributes("<img src=\"test.jpg\" />");? Or do you want to get attributes from the DOM of an already parsed page? The latter is easier. – Jordan

From the DOM but I'm going tro try your first method, thanks ! – Stumpy

@Bruno: that's not actually a method that exists. @Joshua was just using that as a hypothetical use case. – Programmer

Actually the string belongs to an element of the DOM but I have not direct access to it. – Stumpy

@Stumpy - yeah, the function name was one I made up just for illustrative purposes. Sorry that wasn't more clear. – Jordan

@Stumpy - @Matt Ball's answer below looks like it does exactly what you want. Just put for(var attr in lis[member].attributes) { alert(lis[member].attributes[attr].name + "=\"" + lis[member].attributes[attr].value + "\""); } in the spot you've indicated in your comment, and you should see the results you want. – Jordan

@Joshua Carmody Thanks for your answer but it doesn't work. – Stumpy

Answer 1

Use the Node.attributes property of a DOM element. Example:

var foo = document.getElementById('foo'),
    attrs = foo.attributes,
    i = attrs.length,
    attr;

while (i--)
{
    attr = attrs[i];
    console.log(attr.name + '="' + attr.value + '"');
}

Demo: http://jsfiddle.net/mattball/j8AVq/

Programmer

Answer 2

Seems like all these answers point to how to get an attr list from a node but the question asks for attrs from an HTML string. Here is my 2cents.

//turn your string into a node and get your html strings NamedNodeMap
var temp = document.createElement("div");
    temp.innerHTML  = "<div attr-1 attr-2 attr-3 attr-4></div>";
    temp = temp.firstElementChild.attributes; 

    //put the attributes in a an array
    var list = Object.keys(temp).map( function( index ) { return temp[ index ] } );

    console.log( list );

Morava

Answer 3

If you know the attributes to get the value you can do:

var MyValue = document.getElementById("myimage").getAttribute("src")

In JavaScript to loop all attributes:

var el = document.getElementById("someId");
var arr = [];
for (var i=0, attrs=el.attributes, l=attrs.length; i<l; i++){
    arr.push(attrs.item(i).nodeName);
}

The above code was taken from this question

Jquery might be another option:

http://plugins.jquery.com/project/getAttributes

Depravity

Answer 4

[].slice
.apply(document.querySelector('something').attributes)
.forEach(function(item){
    console.log(item, item.name, item.value);
});

Jewell

Hi, welcome to StackOverflow! It's always good to explain your code answers :) – Postimpressionism