我一直在尝试使用jQuery在表单中设置隐藏字段的值，但没有成功。
下面是解释该问题的示例代码。如果我保持输入类型为“文本”，它工作起来没有任何麻烦。但是，将输入类型更改为“hidden”，却不起作用!
<html>
<head>
<script type="text/javascript" src="jquery.js">
</script>
<script type="text/javascript">
$(document).ready(function() {
$("button").click(function() {
$("input:text#texens").val("tinkumaster");
});
});
</script>
</head>
<body>
<p>
Name:
<input type="hidden" id="texens" name="user" value="texens" />
</p>
<button>
Change value for the text field
</button>
</body>
</html>
我还尝试了以下解决方法，通过设置输入类型为“text”，然后为输入框使用“display:none”样式。但是，这也失败了!
jQuery似乎在设置隐藏或不可见的输入字段时遇到了一些麻烦。
什么好主意吗?有没有可行的解决办法?
使用val()不适合我。我必须在任何地方使用.attr()。此外，我有不同类型的输入，在复选框和选择菜单的情况下必须非常明确。
更新文本框
$('#model_name').attr('value',nameVal);
更新文件输入旁边的图像
$('#img-avatar').attr('src', avatarThumbUrl);
更新布尔
if (isActive) {
$('#model_active').attr('checked',"checked");
} else {
$('#model_active').attr('checked', null) ;
}
更新选择(包含数字或字符串)
$('#model_framerate').children().each(function(i, el){
var v = $(el).val();
if (v === String(framerateVal)) {
$(el).attr('selected','selected');
} else {
$(el).attr('selected',null);
}
}
Actually, this is an ongoing problem. While Andy is right about the downloaded source, .val(...) and .attr('value',...) don't seem to actually modify the html. I think this is a javascript problem and not a jquery problem. If you had used firebug even you would have had the same question. While it seems that if you submit the form with the modified values it will go through, the html does not change. I ran into this issue trying to create a print preview of the modified form (doing [form].html()) it copies everything okay, including all changes except values changes. Thus, my modal print preview is somewhat useless... my workaround may have to be to 'build' a hidden form containing the values they have added, or generate the preview independently and make each modification the user makes also modify the preview. Both are inoptimal, but unless someone figures out why the value-setting behavior does not change the html (in the DOM i'm assuming) it will have to do.
