如何为html <textarea>添加默认值?

几点注意事项和澄清:

placeholder='' inserts your text, but it is greyed out (in a tool-tip style format) and the moment the field is clicked, your text is replaced by an empty text field. value='' is not a <textarea> attribute, and only works for <input> tags, ie, <input type='text'>, etc. I don't know why the creators of HTML5 decided not to incorporate that, but that's the way it is for now. The best method for inserting text into <textarea> elements has been outlined correctly here as: <textarea> Desired text to be inserted into the field upon page load </textarea> When the user clicks the field, they can edit the text and it remains in the field (unlike placeholder=''). Note: If you insert text between the <textarea> and </textarea> tags, you cannot use placeholder='' as it will be overwritten by your inserted text.

2016-09-06 00:01:28

几点注意事项和澄清:

placeholder='' inserts your text, but it is greyed out (in a tool-tip style format) and the moment the field is clicked, your text is replaced by an empty text field. value='' is not a <textarea> attribute, and only works for <input> tags, ie, <input type='text'>, etc. I don't know why the creators of HTML5 decided not to incorporate that, but that's the way it is for now. The best method for inserting text into <textarea> elements has been outlined correctly here as: <textarea> Desired text to be inserted into the field upon page load </textarea> When the user clicks the field, they can edit the text and it remains in the field (unlike placeholder=''). Note: If you insert text between the <textarea> and </textarea> tags, you cannot use placeholder='' as it will be overwritten by your inserted text.

2016-09-06 00:01:28

同样，这对我来说也很有效:

<textarea class="form-control" rows="3" name="msg" placeholder="Your message here." onfocus='this.select()'>
<?php if (isset($_POST['encode'])) { echo htmlspecialchars($_POST['msg']);} ?>
</textarea>

在这种情况下，$_POST['encode']来自:

<input class="input_bottom btn btn-default" type="submit" name="encode" value="Encode">

PHP代码被插入到和标记之间。

2014-01-21 06:15:10

你可以使用this.innerHTML。

<textarea name="message" rows =" 10" cols =" 100" onfocus="this。innerHTML= " ">在这里输入您的消息…textarea > < /

当文本区域被聚焦时，它基本上会使文本区域的innerHTML成为空字符串。

2018-06-14 11:32:31

请注意，如果你对文本区域做了更改，在它渲染后;您将得到更新的值，而不是初始化的值。

<!doctype html>
<html lang="en">
    <head>
        <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
        <script>
            $(function () {
                $('#btnShow').click(function () {
                    alert('text:' + $('#addressFieldName').text() + '\n value:' + $('#addressFieldName').val());
                });
            });
            function updateAddress() {
                $('#addressFieldName').val('District: Peshawar \n');
            }
        </script>
    </head>
    <body>
        <?php
        $address = "School: GCMHSS NO.1\nTehsil: ,\nDistrict: Haripur";
        ?>
        <textarea id="addressFieldName" rows="4" cols="40" tabindex="5" ><?php echo $address; ?></textarea>
        <?php echo '<script type="text/javascript">updateAddress();</script>'; ?>
        <input type="button" id="btnShow" value='show' />
    </body>
</html>

正如你所看到的，textarea的值将不同于关注textarea的开始和结束标记之间的文本。

2018-06-14 06:22:08

你也可以添加"value"属性并设置如下:


<textarea value="your value"> </textarea>

2019-06-11 01:46:09

如何为html <textarea>添加默认值?

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