如何编辑 Bootstrap 4 日期输入值?
我们将了解如何编辑 Bootstrap 4 日期输入值。任务是在简单的 JavaScript 代码的帮助下更改日期字段的值。
方法:我们将使用三种网络技术,即 HTML、JavaScript 和 CSS。一般我们选择一些随机值,点击“提交”按钮,它会自动调用一个名为 edit() 的嵌入式 JavaScript 函数。在函数中,我们将从“日(dd)”、“月(mm)”、“年(yy)”三个不同的字段中检索值,并将这些值分别存储在三个不同的变量中,如 d 、 m 、 y 。下一步是检查 d 和 m 的长度是否等于 1,如果是,那么我们要在这些变量前追加一个‘0’。最后,我们必须形成一种格式,即[yyyy-mm-dd],并相应地更改日期字段的值。
步骤:
- Retrieve the values of different fields, such as' DD',' MM' and' YY'.
- Stores the values of different variables in string format.
- Check whether the length of day and month variables is equal to 1.
- If the length of the day and month variable is equal to 1, then attach a 0 in front of it, so that the length becomes 2.
- Build a date format similar to [yyyy-mm-dd].
- Replace the date format with bootstrap date field.
HTML
<!DOCTYPE html>
<html>
<head>
<!--CDN of Bootstrap-->
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css"
integrity=
"sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ"
crossorigin="anonymous">
<!--CDN of google font-->
<style>
@import url(
'https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@500&display=swap');
@import url(
'https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@300;500&display=swap');
.form-control {
display: inline-block;
vertical-align: middle;
float: none;
}
</style>
</head>
<body style="border:4px solid rgb(0, 128, 28);">
<div align="center" class="container">
<form>
<h1 style="font-family:'Roboto Slab',serif;
text-align:center;color:green;">
GeeksForGeeks
</h1>
<br>
<div align="center">
<div style="font-family:'Roboto Slab',serif;
color:rgb(255, 38, 0);text-align:center;"
id="name">
Bootstrap Date Field
</div>
<br>
<input class="form-control" type="date"
value="yyyy-mm-dd" id="d" style=
"border:2px solid rgb(0, 128, 28);
width:200px;height:30px;">
</div>
<br><br><br>
<div style="display:inline;">dd</div>
<input class="form-control" type="number"
value="1" id="d1" max="31" min="1" size="2"
style="border:2px solid rgb(0, 128, 28);
width:80px; height:30px;">
<div style="display: inline;">mm</div>
<input class="form-control" type="number"
value="1" id="m" max="12" min="1" size="2"
style="border: 2px solid rgb(0, 128, 28);
width:80px; height:30px;">
<div style="display: inline;">yyyy</div>
<input class="form-control" type="number"
value="2000" id="y" min="2000" max="3000"
size="4" maxlength="4"
style="border:2px solid rgb(0, 128, 28);
width:100px;height:30px;">
<br>
<div style="text-align: center;">
<button type="button" class="btn btn-primary
btn-sm" onclick="edit()" style=
"background-color: rgb(20, 220, 20);
padding:5px;font-family: 'Roboto Slab', serif;">
submit
</button>
</div>
</form>
<br>
</div>
<script>
function edit() {
// Retrieve the values of 'dd', 'mm', 'yy'
var dd = document.getElementById("d1").value;
var mm = document.getElementById("m").value;
var yy = document.getElementById("y").value;
// Check if the length of day and month is
// equal to 1
if (dd.length == 1) {
dd = "0" + dd;
}
if (mm.length == 1) {
mm = "0" + mm;
}
// Construct a date format like
// [yyyy - mm - dd]
var date = yy + "-" + mm + "-" + dd;
// Replace the date format with BootStrap
// date field
document.getElementById("d").value = date;
}
</script>
</body>
</html>
输出:
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