After the HTML page is loaded, adjust the height of the element according to the content_html/css_WEB-ITnose

Suppose I have a textarea element in my HTML and I want to adjust its height based on the content after it loads. How to do it?

1. The textarea element I defined is as follows

<textarea class="form-control" type="text" name="value" id="value"          placeholder="输入参数值"></textarea>

Note: id = 'value'

The key question here is There are two methods to determine which function will be called after the html is loaded:

2.1 Method 1: By calling $(document).ready(function () {} )

<script type="text/javascript">    function get_text_rows(text) {        return text.split("\n").length;    }        $(document).ready(function () {        document.getElementById('value').rows = get_text_rows($('#value').val());    });</script>

2.2 Method 2: By calling window.onload

<script type="text/javascript">    function get_text_rows(text) {        return text.split("\n").length;    }        window.onload = function() {        document.getElementById('value').rows = get_text_rows($('#value').val());    }</script>