获取表单元素
document.getElementById('form')
等。forms
``document.forms`
返回结果为HTMLCollection
。获取表单组件元素
document.getElementById('form_input')
等。elements
var f = document.forms[0] console.log(f.elements)<form action="#" id="myform">
<input type="text" id="username" name="username" value="请输入用户名">
</form>
<script>
var username = document.getElementById('username')
username.select()
</script>
select
事件
简单来说就是当被选择时的触发的事件<form action="#" id="myform">
<input type="text" id="username" name="username" value="请输入用户名">
</form>
<script>
var username = document.getElementById('username')
username.addEventListener('select', function () {
console.log('select')
})
</script>
selectionStart
选择文本内容的开始索引值selectionEnd
选择文本内容的结束索引值<form action="#" id="myform">
<input type="text" id="username" name="username" value="请输入用户名">
</form>
<script>
var username = document.getElementById('username')
username.addEventListener('select', function () {
console.log('select')
})
</script>
setSelectionRange(start,end,[opt])
参数分别为开始位置,结束位置和方向(forward
、backward
、none
,分别表示从前往后,从后往前,选择方向位置或不重要)。<form action="#" id="myform">
<input type="text" id="username" name="username" value="请输入用户名">
</form>
<script>
var username = document.getElementById('username')
username.addEventListener('select', function () {
console.log('select')
})
</script>