获取输入类型文件的值，如果为空则提醒

how to alert if input type file is empty !?

如果输入类型文件为空，如何提醒！

this is my jquery code but i didnt know how to get the value

这是我的jquery代码，但我不知道如何获得该值

$('.upload').live("click",function()
{
    var imgVal = $('#uploadImage').val();
    if(imgVal=='')
    {
        alert("empty input file");

    }
    return false;

});


<input type="file" name="image" id="uploadImage" size="30" />
<input type="submit" name="upload"  class="send_upload" value="upload" />

3 个解决方案

#1

<script type="text/javascript">
$(document).ready(function() {
    $('#upload').bind("click",function() 
    { 
        var imgVal = $('#uploadImage').val(); 
        if(imgVal=='') 
        { 
            alert("empty input file"); 

        } 
        return false; 

    }); 
});
</script> 

<input type="file" name="image" id="uploadImage" size="30" /> 
<input type="submit" name="upload" id="upload"  class="send_upload" value="upload" /> 

#2

There should be

应该有

$('.send_upload')

but not $('.upload')

但不是$（'。upload'）

#3

HTML Code

HTML代码

<input type="file" name="image" id="uploadImage" size="30" />
<input type="submit" name="upload"  class="send_upload" value="upload" />

jQuery Code using bind method

使用bind方法的jQuery代码

$(document).ready(function() {
    $('#upload').bind("click",function() 
    { if(!$('#uploadImage').val()){
                alert("empty");
                return false;} });  });