DOM2Object

This library converts a DOM tree to an object so that its named properties can be accessed using dot notation.

Example

<div id="mydata">
    <input type="text" name="username" value="johndoe" />
    <input type="password" name="password" value="secret" />
    <button id="mybutton">Click me!</button>
</div>

var data = DOM2Object("#mydata");
data.mybutton.onclick = function() {
    console.log(`Button clicked! ${data.username.value}:${data.password.value}`);
};

In this example, the data object can be seen somehow as the following object:

data = {
    username: HTMLElement { ... },
    password: HTMLElement { ... },
    mybutton: HTMLElement { ... }
}

But data itself keeps the original attributes and methods of the DOM elements. So you can still get access to data.children or data.innerHTML attributes, or data.onclick event handlers, for example.

Setup

Serving from your servers

You can clone this repo and copy the main file into the appropriate folder, to serve using your server:

$ git clone
$ cp dom2object/dist/dom2object.js /path/to/my/html/folder

Using a CDN

You can use this library directly from jsdelivr CDN

<script src="https://cdn.jsdelivr.net/gh/dealfonso/dom2object/dist/dom2object.js"></script>

Use cases

Basic use case

In an HTML fragment like the next one:

<div id="mydata">
    <input type="text" name="username" value="johndoe" />
    <input type="password" name="password" value="secret" />
    <button id="mybutton">Click me!</button>
</div>

We can use DOM2Object to get an object with the DOM tree as properties:

var data = DOM2Object("#mydata");
data.mybutton.onclick = function() {
    alert(`Button clicked! ${data.username.value}:${data.password.value}`);
};

In this case, we gained access to the button with id mybutton as a property of the data object. Have in mind that we are getting access to the raw HTMLElement, So we can access its onclick event handler and assign a new function to it.

Then we can use the data object to access the other elements in the DOM tree, like the username and password inputs. But, as they are also HTMLElements, we can access their attributes and methods (in the example, we are getting value).

The expression is equivalent to the following one:

var data = {
    username: document.querySelector("#mydata input[name='username']"),
    password: document.querySelector("#mydata input[name='password']"),
    mybutton: document.querySelector("#mydata button[id='mybutton']")
};

But we also keep access to the root object's attributes and methods, like data.children or data.innerHTML.

Nested objects

In case of nested objects, the library will create a new object for each named child. For example, in the following HTML fragment:

<div id="mydata2">
  <div id="mainData">
    <input type="text" name="name" value="John">
    <input type="text" name="surname" value="Doe">
  </div>
  <div id="userData">
    <input type="text" name="username" value="johndoe">
    <input type="password" name="password" value="secret">
  </div>
  <button id="mybutton">Click me!</button>
</div>

If we execute data = DOM2Object("#mydata2") we will get an object with an structure like the next one (but keeping the access to the attributes and methods of data):

data = {
    mainData: {
        name: HTMLElement { ... },
        surname: HTMLElement { ... }
    },
    userData: {
        username: HTMLElement { ... },
        password: HTMLElement { ... }
    },
    mybutton: HTMLElement { ... }
}

So it is possible to access the name input as data.mainData.name or data["mainData"]["name"] as in the following example:

var data = DOM2Object("#mydata2");
data.mybutton.onclick = function() {
    alert(`Button clicked! ${data.mainData.name.value}:${data.userData.password.value}`);
};

Anonymous elements

The default behaviour of the library is to ignore anonymous elements. Anonymous elements are those that don't have a name or an id. For example, in the following HTML fragment:

<div id="mydata3">
  <div class="nameData">
    <input type="text" name="name" value="John">
    <input type="text" name="surname" value="Doe">
  </div>
  <div class="userData">
    <input type="text" name="username" value="johndoe">
    <input type="password" name="password" value="secret">
  </div>
  <button id="mybutton">Click me!</button>
</div>

If we execute data = DOM2Object("#mydata3") we will get an object with an structure like the next one:

data = {
    mybutton: HTMLElement { ... }
}

This is because both div elements don't have a name or an id. So they are ignored.

We can make that the library acquires the children of anonymous elements by passing true as second parameter to DOM2Object. In that case, the child elements will be associated to the first parent that has a name or an id. If we make the call data = DOM2Object("#mydata3", true) we will get an object with an structure like the next one:

data = {
    name: HTMLElement { ... },
    surname: HTMLElement { ... },
    username: HTMLElement { ... },
    password: HTMLElement { ... },
    mybutton: HTMLElement { ... }
}

Both use cases may coexists. For example, in the following HTML fragment:

<div id="mydata4">
  <div id="nameData">
    <input type="text" name="name" value="John">
    <input type="text" name="surname" value="Doe">
  </div>
  <div class="userData">
    <input type="text" name="username" value="johndoe">
    <input type="password" name="password" value="secret">
  </div>
  <button id="mybutton">Click me!</button>

If we execute data = DOM2Object("#mydata4", true) we will get an object with an structure like the next one:

data = {
    nameData: {
        name: HTMLElement { ... },
        surname: HTMLElement { ... }
    },
    username: HTMLElement { ... },
    password: HTMLElement { ... },
    mybutton: HTMLElement { ... }
}

Technical details

NOTE: In a common use of the library all the details contained in this section can be ignored in most of cases, but it is important to know them in case you want to use the library in a more advanced way.

The object returned by DOM2Object is a proxy object. This means that the object itself is not the HTMLElement, but a proxy that will redirect the calls to the HTMLElement. This is done to avoid the problem of the HTMLElements being updated in the DOM tree, but the object properties not being updated.

So it may occurr a conflict if you use HTMLElements with an id or a name that is the same as the name of an attribute or method of the HTMLElement (it is extrange, but it may happen). In that case, the named HTMLElement will substitute the existing attribute or method in the proxy object.

e.g.:

<div id="mydata">
    <input type="text" name="children" value="johndoe" />
    <input type="password" name="innerHTML" value="secret" />
</div>
<script>
    var data = DOM2Object("#mydata");
    console.log(data.children.value);
</script>

In this case, the data.children property will be the HTMLElement with name="children", and the data.innerHTML property will be the HTMLElement with name="innerHTML", instead of the legacy attributes of the children and innerHTML attributes from the div element.

If this case happens and it is needed to access the legacy attributes, you can use the data._el.children and data._el.innerHTML attributes.

Proxy object attributes

Appart from the standard HTMLElement attributes and methods, the proxy object will also have the following attributes:

• _el: the original HTMLElement.
• _children: an object with the named children of the HTMLElement (the keys are the name or id and the values are the raw objects).
• _childrenNames: an array with the names of the children of the HTMLElement. It is the same as Object.keys(_children).

If an object has these properties, that means that it has named children and thus it will be a proxy. If it doesn't have these properties, it will be a raw HTMLElement.

Documentation

The main function is DOM2Object, which receives a DOM element or a CSS selector and returns an object with the DOM tree as properties.

DOM2Object(elementOrSelector, acquireChildrenFromAnonymous = false);

• elementOrSelector: a DOM element or a CSS selector.
• acquireChildrenFromAnonymous: a boolean value indicating if the children of anonymous elements should be acquired. Default: false.

The DOM2Object function also has the following attributes and methods:

• DOM2Object.version: contains the version of the library.
• DOM2Object.multiple(elements, acquireChildrenFromAnonymous = false): a function that receives an array of DOM elements or CSS selectors and returns an array of objects with the DOM tree as properties.
  • elements: an array of DOM elements or CSS selectors, or a single selector may select multiple objects in the DOM (e.g. div). Even if associated, the result will be flattened to a single array.
  • acquireChildrenFromAnonymous: a boolean value indicating if the children of anonymous elements should be acquired. Default: false.