jQuery 获取输入类型文件的值,如果为空则发出警报
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时间:2020-08-26 15:10:56 来源:igfitidea点击:
get the value of input type file , and alert if empty
提问by Mac Taylor
how to alert if input type file is empty !?
如果输入类型文件为空,如何发出警报!?
this is my jquery code but i didnt know how to get the value
这是我的 jquery 代码,但我不知道如何获取值
$('.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" />
回答by Fosco
<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" />
回答by Denis
There should be
应该有
$('.send_upload')
but not $('.upload')
但不是 $('.upload')
回答by loyola
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 bindmethod
使用绑定方法的jQuery代码
$(document).ready(function() {
$('#upload').bind("click",function()
{ if(!$('#uploadImage').val()){
alert("empty");
return false;} }); });