关于jsp中的聚焦方法 [英] regarding focus method in jsp

问题描述

朋友们，

我有一个名为file_upload.jsp的jsp文件和一个名为file_upload.js的Java脚本文件.在jsp页面中，我有一个字段作为文件上载，而id为file_upload.为此，如果我没有输入文件上载字段然后去它正在显示警报消息，请选择要上载的文件，但它不专注于文本字段.我的要求是无论我忘记输入值(错误来了)，都必须专注于该字段.我的代码如下.

Hi friends,

i have one jsp file called as file_upload.jsp and one java script file called file_upload.js.In jsp page i have a field as file upload and the id is file_upload.For this if i did not enter the file upload field and going then it is displaying the alert message as please select a file to upload but it is not focusing on the textfield.My requirement is it has to focus on the field wherever i forget to enter the values(the error comes).My code is as follows.

if (file_upload == "") {
            alert("Please select a file to Upload !!");
            document.getElementById('file_upload').focus();
            return false; }

我的代码中有任何错误或必须添加的其他内容.这对我来说非常紧急，任何帮助将不胜感激.

Any thing wrong in my code or any thing extra i have to add.This is very urgent to me any ones help will be greately appreciated.

推荐答案

我不知道''出于安全原因，您认为可以使文件上载控件成为焦点，就像无法从中获取文本一样.

I don''t think it''s possible to make the file upload control the focus, just as it''s not possible to get the text from it, for security reasons.

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