jQuery清除焦点上的输入文本 [英] jQuery clear input text on focus
问题描述
我有这个 jQuery
脚本:
$(document) .ready(function(){
$(':input:enabled:visible:first')。focus(); $ b $('。letters')。keyup(function(){
$ var $ this = $(this);
if($ this.val()。length> 1)
$ this.val($ this.val()。substr(0,1) );
$(this).next('input')。focus();
});
});
它会将焦点设置在第一个 input ='text'
字段在页面加载。当用户输入一个字符时,它将把焦点移到下一个输入字段。它也将限制每个字段允许的字符数(目前是1个字符)。
我想知道是否有可能清除焦点上的输入字段的当前值。当用户使用cursror单击来关注字段,而且当 $(this).next('input')。focus();
设置关注下一个输入字段。
也可以验证字符只允许使用字母字符吗?
$('input')。on('keydown' ,函数(e){
if(!/ [az] | [AZ] /。test(String.fromCharCode(e.which)))
return false;
});
要清除上的输入字段, / code>& ($'code> $('input')。点击focusin',function(){
this.value ='';
});
请注意,当点击进入非集中的输入控件。
$ b
Demo : http://jsfiddle.net/xbeR2/
I have this jQuery
script:
$(document).ready(function() {
$(':input:enabled:visible:first').focus();
$('.letters').keyup( function() {
var $this = $(this);
if($this.val().length > 1)
$this.val($this.val().substr(0, 1));
$(this).next('input').focus();
});
});
It will set focus on the first input='text'
field on page load. When a user enters a character it will move focus to the next following input field. It will also limit the number of characters allowed in each field (currently 1 character).
I wonder if it's possible to clear the current value of the input field on focus. Both when a user clicks with the cursror to focus the field but also when the $(this).next('input').focus();
sets focus on the next input field.
Also is it possible to validate the characters to only allow alphabetical characters?
To filter the input, use
$('input').on('keydown', function(e) {
if( !/[a-z]|[A-Z]/.test( String.fromCharCode( e.which ) ) )
return false;
});
To clear the input field on click
& focus
, use
$('input').on('click focusin', function() {
this.value = '';
});
Be aware of that this event will fire twice, when you click into a non-focused input control in its current form.
Demo: http://jsfiddle.net/xbeR2/
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