#26 JS: HTML DOM Events - Part 4(Start Over Version) - iT 邦幫忙::一起幫忙解決難題，拯救 IT 人的一天

2021 iThome 鐵人賽

DAY 26

Modern Web

Learn & Play JavaScript -- Entry-Level Front-End Web Development系列第 26 篇

#26 JS: HTML DOM Events - Part 4(Start Over Version)

13th鐵人賽 front-end javascript dom event

Vida Lin

2021-09-26 17:20:50

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After understanding the basic HTML DOM Event concept in the last article, now we move on to an example of inserting HTML language in <script>.

Step 1. Adding `<div>` and `<input>` tags in `<body></body>`

In the beginning, we write box in the division.
input is a tag allowing users to key in context in a single line.

    <div id="box">Box</div>
    <input id="input1" type="text">

Step 2.

Use innerHTML to replace the initial--box--with the new context--Welcome to HTML DOM v2.
Install a listener called keyup.
(keyup = click a button of a keyboard and it bounces back right away.)

Usually when a function is used for calling back, the system will input an object--event--into it.
So we can name a parameter(I wrote "e") to output the value of the input frame.
Usage scenario: when creating a register page, we may need a listener to monitor the user's behavior, e.g. checking the value type of the password they key in.

<script type="text/javascript">
       const box1 = document.getElementById('box')
       box1.innerHTML= '<p>Welcome to HTML DOM v2.</p>'
       const in1 = document.getElementById('input1')
       in1.addEventListener('keyup',function(e) {
       console.log('e.target.value',e.target.value)
       })
})
</script>

Music of Today: Hello, Anxiety by Phum Viphruit

PS, Use this song to look at the difficulty learning coding at its face :)

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