如何创建一个带有水印的jQuery文本框？
我试图创建一个jQuery水印的文本框，我能够在我的Asp.net应用程序中创建，但我想要做的是创建一个非ASP.NET版本，我可以使用简单的HTML网页或PHP书面应用程序。 我试图改变代码，但它不起作用。
（它所做的是水印文本来自输入的'title'属性）
无论如何，这里是我从asp.net代码：
aspx页面的代码：
<div id="TableWrapper">
<table class="style1" runat="server" id="FormTable">
<tr>
<td colspan="3">
<h1>Get in touch with us</h1>
<p>Use the form below to get in touch with us. Enter your name, e-mail address, and your home or business phone number to get in touch with us.</p>
</td>
</tr>
<tr>
<td>
Name
</td>
<td>
<asp:TextBox ID="Name" runat="server" ToolTip="Enter your name" CssClass="InputBox"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="Name" CssClass="ErrorMessage" ErrorMessage="Enter your name">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
E-mail address
</td>
<td>
<asp:TextBox ID="EmailAddress" runat="server" ToolTip="Enter your e-mail address" CssClass="InputBox"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="EmailAddress" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Enter an e-mail address">*</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="EmailAddress" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Enter a valid e-mail address" ValidationExpression="w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*">*</asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td>
E-mail address again
</td>
<td>
<asp:TextBox ID="ConfirmEmailAddress" runat="server" ToolTip="Confirm your e-mail address" CssClass="InputBox"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="ConfirmEmailAddress" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Confirm the e-mail address">*</asp:RequiredFieldValidator>
<asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="EmailAddress" ControlToValidate="ConfirmEmailAddress" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Retype the e-mail address">*</asp:CompareValidator>
</td>
</tr>
<tr>
<td>
Home phone number
</td>
<td>
<asp:TextBox ID="PhoneHome" runat="server" ToolTip="Enter your home phonenumber" CssClass="InputBox"></asp:TextBox>
</td>
<td>
<asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="ValidatePhoneNumbers" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Enter your home or business phone number" OnServerValidate="HomePhoneCustom_ServerValidate">*</asp:CustomValidator>
</td>
</tr>
<tr>
<td>
Business phone number
</td>
<td>
<asp:TextBox ID="PhoneBusiness" runat="server" ToolTip="Enter your business phonenumber" CssClass="InputBox"></asp:TextBox>
</td>
<td>
</td>
</tr>
<tr>
<td>
Comments
</td>
<td>
<asp:TextBox ID="Comments" runat="server" Height="78px" TextMode="MultiLine" ToolTip="Enter your comment here" CssClass="InputBox"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="Comments" CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="Enter a comment">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID="SendButton" runat="server" Text="Send" OnClick="Send_Click" />
</td>
<td>
</td>
</tr>
<tr>
<td colspan="3">
<asp:ValidationSummary ID="ValidationSummary1" runat="server" CssClass="ErrorMessage" HeaderText="Please correct the following errors before you press the Send button:" />
</td>
</tr>
</table>
</div>
<asp:Label ID="Message" runat="server" Text="Message Sent" Visible="False" CssClass="Attention" />
<p runat="server" id="MessageSentPara" visible="false">Thank you for your message.
We’ll get in touch with you if necessary.</p>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<div class="PleaseWait">Please Wait... </div>
</ProgressTemplate>
</asp:UpdateProgress>
<script src="../Scripts/jquery.updnWatermark.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
/*
$(':input[type=text], textarea').each //selector
(
function () { //function
var newText = 'Please enter your ' +$(this).parent().prev().text().toLowerCase().trim(); //gets the text of the previous element
$(this).attr('value', newText);
}).one('focus', function(){ //one will be done once, //.bind works for everytime the event is invoked
this.value = '', this.className = ''}).addClass('Watermark').css('width', '300px'); //alternate this.class ''
*/
/*
Notice how there’s no need to select any items; you just call the updnWatermark method on the jQuery
object (using its $ shortcut) without specifying any selectors. The updnWatermark method then scans
the form looking for form fields that have a title attribute. You can optionally pass in a CSS class that
defines the presentation of the text labels. In this example, the .Watermark and .Watermark label
selectors define the position and color of the watermark text that is placed on top of the text boxes.
*/
$.updnWatermark.attachAll({ cssClass: 'Watermark' });
$('form').bind('submit', function()
{
if (Page_IsValid)
{
$('#TableWrapper').slideUp(3000);
}
});
});
/* === pageLoad ===
pageLoad() is called after every UpdatePanel refresh
In the case of initialization code that should run once, $(document).ready() is the ideal solution.
The pageLoad method (which is part of the client-side ASP.NET AJAX Library) serves the same
purpose as jQuery’s document ready, with one exception: it also fires after a partial page update,
which is what takes place after you submit the form because of the UpdatePanel in the user control.
*/
function pageLoad()
{
$('.Attention').animate({ width: '600px' }, 3000).
animate({ width: '100px' }, 3000).fadeOut('slow');
}
</script>
以下是jquery水印的代码：
/*
* jQuery Watermark Plugin (v1.0.0)
* http://updatepanel.net/2009/04/17/jquery-watermark-plugin/
*
* Copyright (c) 2009 Ting Zwei Kuei
*
* Dual licensed under the MIT and GPL licenses.
* http://www.opensource.org/licenses/mit-license.php
* http://www.opensource.org/licenses/gpl-3.0.html
*/
(function($) {
$.fn.updnWatermark = function(options) {
options = $.extend({}, $.fn.updnWatermark.defaults, options);
return this.each(function() {
var $input = $(this);
// Checks to see if watermark already applied.
var $watermark = $input.data("updnWatermark");
// Only create watermark if title attribute exists
if (!$watermark && this.title) {
// Inserts a span and set as positioning context
var $watermark = $("<span/>")
.addClass(options.cssClass)
.insertBefore(this)
.hide()
.bind("show", function() {
$(this).children().fadeIn("fast");
})
.bind("hide", function() {
$(this).children().hide();
});
// Positions watermark label relative to positioning context
$("<label/>").appendTo($watermark)
.text(this.title)
.attr("for", this.id);
// Associate input element with watermark plugin.
$input.data("updnWatermark", $watermark);
}
// Hook up blur/focus handlers to show/hide watermark.
if ($watermark) {
$input
.focus(function(ev) {
$watermark.trigger("hide");
})
.blur(function(ev) {
if (!$(this).val()) {
$watermark.trigger("show");
}
});
// Sets initial watermark state.
if (!$input.val()) {
$watermark.show();
}
}
});
};
$.fn.updnWatermark.defaults = {
cssClass: "updnWatermark"
};
$.updnWatermark = {
attachAll: function(options) {
$("input:text[title!=''],input:password[title!=''],textarea[title!='']").updnWatermark(options);
}
};
})(jQuery);
我打算在我的简单html页面中显示的内容如下所示：
<input type="text" class="TheWaterMarkjquery" title="TheWatermark"/>
<script type="text/javascript">
$(function(){
$.updnWatermark.attachAll({ cssClass: 'Watermark' });
});
我不确定是否可以使用这种方法，但我希望我可以使用此解决方案。
主席先生/女士，您的答案将非常有帮助，并且非常感谢。谢谢你++
你为什么不能用这个？ 它的jQuery插件，它独立于ASP.NET或PHP。 如果浏览器支持它，它将使用HTML5占位符属性，否则将回退到其他方式。
您可以简单地使用placeholder属性。 这是特定于HTML5的，我没有看到指定不是HTML5的问题：
<fieldset>
<legend>Mail Account</legend>
<p><label>Name: <input type="text" name="fullname" placeholder="John Ratzenberger"></label></p>
<p><label>Address: <input type="email" name="address" placeholder="john@example.net"></label></p>
<p><label>Password: <input type="password" name="password"></label></p>
<p><label>Description: <input type="text" name="desc" placeholder="My Email Account"></label></p>
</fieldset>
更多信息可以在这里找到：w3.org占位符属性
启用IE9的功能，在另一个SO问题中提到：IE9中的占位符和Internet Explorer的输入占位符
<input type="text" id="Name">
<script>
$(document).ready(function () {
// On page load, apply watermark to input
$('#Name').dwaterm();
});
</script>
<script>
(function ($)
$.fn.extend({
dwaterm: function () {
// Add watermark to textbox
return this.each(function () {
// Define what happens when the textbox comes under focus
// Remove the watermark class and clear the box
var obj = $(this);
$(this).focus(function () {
$(this).filter(function () {
// We only want this to apply if there's not
// something actually entered
return $(this).val() == "" || $(this).val() == "Type here"
}).removeClass("watermarkOn").val("");
});
// Define what happens when the textbox loses focus
// Add the watermark class and default text
$(this).blur(function () {
$(this).filter(function () {
// We only want this to apply if there's not
// something actually entered
return $(this).val() == ""
}).addClass("watermarkOn").val("Type here");
});
});
}
});
})(jQuery);
</script>