想要分派输入文本框的默认值
[英]Want to disapper input textbox default value
问题描述
Please do not give a negative vote if I am wrong with asking this question. 
如果我对这个问题有误，请不要投反对票。 I have a TextBox like this: 我有一个像这样的TextBox：
<input class="login-inpt" runat="server" name="loginName" type="text" value="User Name" />
It currently holds a default value. 当前保留默认值。 I want the default value to be cleared and replaced with a cursor when I click on the TextBox. 我希望清除默认值，并在单击TextBox时将其替换为光标。
7 个解决方案
解决方案1
8 2013-08-29 18:54:36
For newer browsers (IE>9): 对于较新的浏览器（IE> 9）：
<input type="text" id="userName" placeholder="User Name" />
For older: 对于较老的：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Placeholder support</title>
</head>
<body>
<input type="text" id="userName" placeholder="User Name" />
<script src="../js/vendor/jquery-1.10.2.min.js"></script>
<script src="../js/vendor/jquery-migrate-1.2.1.js"></script>
<script src="../js/vendor/modernizr-latest.js"></script>
<script src="../js/placeholder.js"></script>
</body>
</html>
placeholder.js (jQuery, Modernizr) placeholder.js（jQuery，Modernizr）
var Placeholder = (function ($, document) {
/* Static Content */
var _$document = $(document);
/* Events */
var _initPlaceholders = function () {
_$document.find('input:text').each(function () {
var $this = $(this);
$this.css({ color: '#888' }).val($this.attr('placeholder'));
});
};
var _placeholderEvent = function () {
var $input = $(this), placeholderValue = $input.attr('placeholder');
if ($input.val() === placeholderValue) {
$input.css({ color: '#000' }).val('');
return;
}
if ($input.val() === '') {
$input.css({ color: '#888' }).val(placeholderValue);
}
};
var _bindEvents = function () {
if (!Modernizr.input.placeholder) {
_initPlaceholders();
_$document.on('focus blur', 'input:text', _placeholderEvent);
}
};
var init = function () {
_bindEvents();
};
return {
init: init
};
})(jQuery, document);
Placeholder.init();
解决方案2
1 2013-08-29 14:13:37
解决方案3
1 已采纳 2013-08-29 15:25:56
你可以试试这个
<input type="text" value="user name" onfocus="if(this.value=='user name') this.value='';">
解决方案4
0 2013-08-29 14:14:29
add the following as an attribute to your input tag: 将以下内容添加为输入标签的属性：
onfocus="if(this.value=='A new value') this.value='';"
From: How to clear a textbox using javascript 来自： 如何使用JavaScript清除文本框
解决方案5
0 2013-09-03 05:40:15
I got the solution Thanks. 我得到了解决方案，谢谢。 input type="text" id="userName" onfocus="inputFocus(this)" onblur="inputBlur(this)" 输入type =“ text” id =“ userName” onfocus =“ inputFocus（this）” onblur =“ inputBlur（this）”
函数inputFocus（i）{if（i.value == i.defaultValue）{i.value =“”;
i.style.color = "#000";
i.style.color =“＃000”;
} } function inputBlur(i) { if (i.value == "") { i.value = i.defaultValue;
}}函数inputBlur（i）{if（i.value ==“”）{i.value = i.defaultValue;
i.style.color = "#888";
i.style.color =“＃888”;
} }
}}
解决方案6
0 2013-09-03 21:48:01
You already got good answers but if you are newbie it might interest you how it could work without libraries. 您已经有了很好的答案，但是如果您是新手，可能会感兴趣，如果没有库，它将如何工作。
Here is HTML: 这是HTML：
<input id="textBox" class="textBox phrase" type="text" value="Enter Your Text..">
you don't need to set class and id you could pick one of them 您不需要设置班级和ID，您可以选择其中之一
Here is JavaScript: 这是JavaScript：
var textBox = document.getElementById('textBox'), //probably the fastest method
/**************************additionally possible****************************
var textBox = document.getElementsByTagName('input')[0], //returns HTMLInputElement list (since we've got only one we chose the first one)
or
var textBox = document.querySelectorAll('textBox'), //works almost the same way as jquery does except you don't get all jquerys functionality
or
var textBox = document.getElementsByClassName('textBox')[0], //i guess its a least supported method from the list
***************************************************************************/
//text you want to choose for you input
phrase = "Enter Your Text..";
function addEvent(el, ev, fn) {
//checking method support
//almost every browser except for ie
if(window.addEventListener) {
el.addEventListener(ev, fn, false);
}
//ie
else if(window.attachEvent) {
el.attachEvent('on' + ev, fn);
el.dettachEvent('on' + ev, fn);
}
}
addEvent(textBox, 'focus', function (){
//cross browser event object
var e = e || window.event,
target = e.target;
//if the text in your text box is your phrase then clean it else leave it untouched
target.value = target.value === phrase ? "" : target.value;
});
addEvent(textBox, 'blur', function (){
//cross browser event object
var e = e || window.event,
target = e.target;
//if your text box is not empty then leave it else put your phrase in
target.value = target.value ? target.value : phrase;
});
解决方案7
0 2013-09-03 22:10:13
$('.login-inpt').focus(function() {
$(this).val('');
});
$('.login-inpt').focusout(function() {
$(this).val('User Name');
});
check out here http://jsfiddle.net/TDUKN/ 在这里查看http://jsfiddle.net/TDUKN/
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