Template Tag in HTML5

W3C has introduced a new "template" tag that provides a mechanism to define HTML markup fragments as prototypes. In practice, a template can be used to insert fragments of HTML code into your page, for example:

<template id="rowTemplate">

<tr>

<td class="record"></td>

<td></td>

<td></td>

</tr>

</template>
 

Features

The following are the features of the template tag:

  • The template code can be defined nearly anywhere; the head, body or even a frameset.
  • Templates will not be displayed
  • Templates are not considered to be part of the document, in other words using document.getElementById(“mytablerow”) will not return child nodes.
  • Templates are inactive until used, in other words enclosed images will not download, media will not play, scripts will not run, and so on.

Using templates

To use a template, it must be cloned and inserted into the DOM. For example, assuming the following HTML:

<table id="testTable">

    <thead>

        <tr>

            <td>

                ID

            </td>

            <td>

                name

            </td>

            <td>

                twitter

            </td>

        </tr>

    </thead>

    <tbody>

        <!-- rows to be appended here -->

    </tbody>

</table>

<!-- row template -->

<template id="rowTemplate">

<tr>

<td class="record"></td>

<td></td>

<td></td>

</tr>

</template>
 
Use the following to clone the new row and append it to the table in JavaScript:
 

// get tbody and row template

var t = document.querySelector("#testTable tbody"),

row = document.getElementById("rowTemplate");

// modify row data

var td = row.getElementsByTagName("td");

td[0].textContent = "1";

td[1].textContent = "Sunny";

td[2].textContent = "@sunny_delhi";

// clone row and insert into table

t.appendChild(row.content.cloneNode(true));


Q: Can we use templates?

A: Not yet. For now, it’s supported in the latest version of Chrome and Firefox nightly builds but yes, there’s a shim demonstrated that you can use as a workaround until it is implemented by all prominent browsers. It probably works in IE also.

Shim DemoLink: jsfiddle

Separation of HTML code and JavaScript is a good idea!