IE7 / IE8与JQuery .removeAttr（'禁用'）交互，不应用css

问题描述

这更像是一个好奇而不是一个问题，但我想知道为什么以下不起作用。

This is more of a curiosity than a question, but I'm wondering why the following isn't working.

假设我有一个带选择器的html表单和提交按钮。

Say I have an html form with a selector and a submit button.

 <form action="/foo/createActivity" method="post" name="activityform" id="activityform" >

<select name="activity" id="activity" >
<option value="1" >Activity 1</option>
<option value="2" >Activity 2</option>
</select>
<input type="submit" class="submit" id="add" value="Add >>"/>
</form>

然后我有一个jQuery定义的ajax调用

Then I have an ajax call with jQuery defined

$('#activity').change(function() {
    tryDisable($('#activity').val());
});

function tryDisable(activity) {
$.ajax({
    type: 'GET',
    contentType: 'application/json',
    cache: false,
    url: '/foo/checkActivity',
    data: {
        activity: activity
    },
    success: function(disableSubmit) {

        if (disableSubmit == "true") {
            $('#add').attr('disabled', 'true');
        } else {
            $('#add').removeAttr('disabled'); // Problem in IE, doesn't take away CSS of disabled
            // $('#add').css({"text-align" : "center"}); 
            // NO idea why the above fixes the problem, TODO find out
        }
    },
    dataType: 'json'
});
return false;
}

你会在我的评论中看到.removeAttr（'禁用' ）导致按钮重新启用，但按钮仍然看起来像它被禁用（灰色显示）。但是，如果我像在注释掉的行中那样通过jquery'发送'css，则应用正确的，非禁用的样式。正如我所料，Firefox和Chrome只在第一行正常工作。

You'll see in my comments that just the .removeAttr('disabled') is causing the button to re-enable, but the button still looks like it's disabled (gray-ed out). However, if I 'tickle' the css via jquery as I did in the commented out line, the correct, non-disabled styling applies. Firefox and Chrome work fine with just the first line, as I expected.

有谁知道为什么会这样？ IE在这做什么，这太奇怪了？

Does anyone know why this might be? What's IE doing here that's so odd?

推荐答案

之前我确实遇到过同样的问题。我用Google搜索并在上找到了这个说明。

I did have the same problem before. I googled it and found this note from jQuery website.

注意：尝试使用删除内联 onclick 事件处理程序.removeAttr（）将无法在Internet Explorer 6,7或8中实现所需效果。为避免潜在问题，请改为使用 .prop（）：

Note: Trying to remove an inline onclick event handler using .removeAttr() won't achieve the desired effect in Internet Explorer 6, 7, or 8. To avoid potential problems, use .prop() instead:

$element.prop("onclick", null);
console.log("onclick property: ", $element[0].onclick); // --> null

我还在SO中发现了一些关于 .removeAttr的帖子（）：

I also found a couple of posts here in SO regarding the .removeAttr():

• removeAttr() issue
• .prop('checked',false) or .removeAttr('checked')?

这也很有帮助。

这篇关于IE7 / IE8与JQuery .removeAttr（'禁用'）交互，不应用css的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！