您好我在我的网站上创建了一个表单。我正在使用placeholder="Full Name"，但在IE8（以及可能的其他IE版本）中查看时，表单中没有任何内容出现
我尝试过使用value="" onfocus="if (this.value == 'Full Name') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Full Name';}"，但表单仍然是空的。出于某种原因，当您单击表单时会显示“全名”，然后将其关闭。
我正在研究的网站是[usspcatalystcentre.org.uk] [1]，你可以看到我的意思。前两个表单（标题和全名）是我尝试使用
的地方value="" onfocus="if (this.value == 'Full Name') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Full Name';}"
表单的其余部分是我刚刚使用placeholder
以下是我正在处理的实际代码
<form action="contact.php" method="post">
<input id=title name=title type=text value="" onfocus="if(this.value=='Username') this.value='';" onblur="if(this.value=='') this.value='Username';" required class="top-formfields" value='<?php print $_SESSION['title']?>'> <br /><br />
<input id=fullname name=fullname type=text value="" onfocus="if(this.value=='Full Name') this.value='';" onblur="if(this.value=='') this.value='Full Name';" required class="top-formfields" value='<?php print $_SESSION['fullname']?>'> <br /><br />
<input id=companyname name=companyname type=text placeholder="Company Name" required class="top-formfields" value='<?php print $_SESSION['companyname']?>'> <br /><br />
<input id=companynumber name=companynumber type=text placeholder="Company Registered Number" required class="top-formfields" value='<?php print $_SESSION['companynumber']?>'> <br /><br />
<textarea id=address name=address rows=5 placeholder="Address" required class="top-textarea"><?php print $_SESSION['address']?></textarea> <br /><br />
<input id=postcode name=postcode type=text placeholder="Post Code" required class="top-formfields" value='<?php print $_SESSION['postcode']?>'> <br /><br />
<input id=phonenumber name=phonenumber type=text placeholder="Phone Number" required class="top-formfields" value='<?php print $_SESSION['phonenumber']?>'> <br /><br />
<input id=email name=email type=text placeholder="Email" required class="top-formfields" value='<?php print $_SESSION['email']?>'> <br /><br />
<input id=mobile name=mobile type=text placeholder="Mobile" required class="top-formfields" value='<?php print $_SESSION['mobile']?>'> <br /><br />
<input id=website name=website type=text placeholder="Website URL" required class="top-formfields" value='<?php print $_SESSION['website']?>'> <br /><br />
先谢谢，汤姆
答案 0 :(得分：6)
placeholder属性是一项新的HTML5改进。旧的IE-s不支持它 -
http://diveintohtml5.info/forms.html
要模仿跨浏览器，您可能需要使用jQuery - example
答案 1 :(得分：3)
IE-9不支持占位符，所以我想到的第一个解决方案就是这个。
祝你好运！<script type="text/javascript">
if(navigator.userAgent.indexOf("MSIE") > 0 )
{
$(function()
{
var input = document.createElement("input");
if(('placeholder' in input) == false)
{
$('[placeholder]').focus(function()
{
var i = $(this);
if(i.val() == i.attr('placeholder'))
{
i.val('').removeClass('placeholder');
if(i.hasClass('password'))
{
i.removeClass('password'); this.type='password';
}
}
}).blur(function()
{
var i = $(this);
if(i.val() == '' || i.val() == i.attr('placeholder'))
{
if(this.type=='password')
{
i.addClass('password'); this.type='text';
}
i.addClass('placeholder').val(i.attr('placeholder'));
}
}).blur().parents('form').submit(function()
{
$(this).find('[placeholder]').each(function()
{
var i = $(this);
if(i.val() == i.attr('placeholder')) i.val('');
});
});
}
});
}
</script>
答案 2 :(得分：0)
Tom，占位符不是IE8支持的属性。
我认为这可以帮助您实现目标：
使用“全名”预填充字段。提前给它值=“全名”作为默认值。
onfocus= "if (this.value=='Full Name'){this.select();this.value='';this.style.color='#999999';}else{this.style.color='#000000';}"
onclick= "if (this.value=='Full Name'){this.select();this.value='';this.style.color='#999999';}else{this.style.color='#000000';}"
onblur= "if (this.value==''||this.value=='Full Name'){this.value='Full Name';this.style.color='#999999';}else{this.style.color='#000000';}"
onkeyup= "if (this.value=='Full Name'){this.select();this.style.color='#999999';}else{this.style.color='#000000';}"
onchange="if (this.value=='Full Name'){this.style.color='#999999';}else{this.style.color='#000000';}"
答案 3 :(得分：0)
if (!('placeholder' in $('<input>')[0])) { // Create a dummy element for feature detection
$('input[placeholder], textarea[placeholder]').blur(add).focus(remove).each(add); // Select the elements that have a placeholder attribute
$('form').submit(function(){$(this).find('input[placeholder], textarea[placeholder]').each(remove);}); // Remove the placeholder text before the form is submitted
}
答案 4 :(得分：0)
将以下代码保存为.js，并确保更改输入类型
$(document).ready(function () {
if ($.browser.msie) { //this is for only ie condition ( microsoft internet explore )
$('input[type="text"][placeholder], textarea[placeholder]').each(function () {
var obj = $(this);
if (obj.attr('placeholder') != '') {
obj.addClass('IePlaceHolder');
if ($.trim(obj.val()) == '' && obj.attr('type') != 'password') {
obj.val(obj.attr('placeholder'));
}
}
});
$('.IePlaceHolder').focus(function () {
var obj = $(this);
if (obj.val() == obj.attr('placeholder')) {
obj.val('');
}
});
$('.IePlaceHolder').blur(function () {
var obj = $(this);
if ($.trim(obj.val()) == '') {
obj.val(obj.attr('placeholder'));
}
});
}
});
答案 5 :(得分：0)
如果您使用的是jQuery 1.9+，请务必添加浏览器检测。您可以使用此命令从终端安装npm install jquery.browser