English 中文(简体)
jQuery.not()方法工作不正常
原标题:jQuery .not() method not working correctly

I m trying to make all textareas remove default text on focus, except those of class "pre-fill". But the problem is the textareas of class "pre-fill" are still being selected and included.

Suggestions on how to fix this? Thanks.

jQuery(document).ready(function inputHide(){

    $( textarea, input:text, input:password ).not($( .pre-fill )).focus(function() {
            if ($(this).val() === $(this).attr( defaultValue )) {
                $(this).val(  );
            }
        }).blur(function() {
            if ($(this).val()===  ) {
                $(this).val($(this).attr( defaultValue ))
            }
        });

});
最佳回答

您不应该在.not方法调用中有jQuery变量($)。试试这个:

.not( .pre-fill )

在代码的上下文中:

$( textarea, input:text, input:password ).not( .pre-fill ).focus(function() {
        if ($(this).val() === $(this).attr( defaultValue )) {
            $(this).val(  );
        }
    }).blur(function() {
        if ($(this).val()===  ) {
            $(this).val($(this).attr( defaultValue ))
        }
    });
问题回答

您还可以使用:not()选择器

请注意,this.value$(this).val()效率高得多,因为它是对DOM元素属性的直接访问,而不是通过首先构建jQuery对象然后调用jQuery方法来访问完全相同的属性。

$( textarea, input:text:not(.pre-fill), input:password:not(.pre-fill) )
   .focus(function() {           
        if (this.value === $(this).attr( defaultValue )) {
            this.value = "";
        }
    }).blur(function() {
        if (this.value ===   ) {
            this.value = $(this).attr( defaultValue );
        }
    });




相关问题
selected text in iframe

How to get a selected text inside a iframe. I my page i m having a iframe which is editable true. So how can i get the selected text in that iframe.

How to fire event handlers on the link using javascript

I would like to click a link in my page using javascript. I would like to Fire event handlers on the link without navigating. How can this be done? This has to work both in firefox and Internet ...

How to Add script codes before the </body> tag ASP.NET

Heres the problem, In Masterpage, the google analytics code were pasted before the end of body tag. In ASPX page, I need to generate a script (google addItem tracker) using codebehind ClientScript ...

Clipboard access using Javascript - sans Flash?

Is there a reliable way to access the client machine s clipboard using Javascript? I continue to run into permissions issues when attempting to do this. How does Google Docs do this? Do they use ...

javascript debugging question

I have a large javascript which I didn t write but I need to use it and I m slowely going trough it trying to figure out what does it do and how, I m using alert to print out what it does but now I ...

Parsing date like twitter

I ve made a little forum and I want parse the date on newest posts like twitter, you know "posted 40 minutes ago ","posted 1 hour ago"... What s the best way ? Thanx.

热门标签