文件类型的onchange jQuery验证

本文介绍了文件类型的onchange jQuery验证的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在onchange事件中，我要在上传文本附近显示图像名称.

What i have is to display the image name near the upload text in the onchange event.

这里我需要对onchange进行验证，它应该显示错误以及文件名

Here i need to have the validation on the onchange and it should display the error along with the file name

这是我尝试过的.

Upload<input type="file" onchange=" document.getElementById('spanFileName').innerHTML = this.value;" style="display:block;margin-top: -20px;opacity: 0;" >

注意:

我不想通过设置规则来单独进行验证，我想在onchange中进行验证，但是如果我将脚本包含在输入类型文件代码中就可以了

I don't want to do the validation in a seperate by setting rules, i want to do it in onchange, but it will be ok if i have the script inside the input type file code

更新:如果我要在5秒内显示和隐藏文件名，那会更好，因为我不知道在输入类型文件代码中编写脚本

Update : It will be better if i have the file name to be displayed and hide in 5 seconds, as i don't know to write script inside the input type file code

我该怎么做，请帮助

推荐答案

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Validation</title>
  <script src="http://code.jquery.com/jquery-1.10.2.js"></script>
  <style type="text/css">
  label input[type="file"]
{
display: block;
margin-top: -20px;
opacity: 0;
}
  </style>
  <script>
   $(window).ready(function() {
$(document).delegate('#Upload','change',function(){
  var s=$(this).val();
  function stringEndsWithValidExtension(stringToCheck, acceptableExtensionsArray, required) {
    if (required == false && stringToCheck.length == 0) { return true; }
    for (var i = 0; i < acceptableExtensionsArray.length; i++) {
        if (stringToCheck.toLowerCase().endsWith(acceptableExtensionsArray[i].toLowerCase())) { return true; }
    }
    return false;
}
$('#spanFileName').html(s);
setTimeout(function(){

  $('#spanFileName').html("");
},15000)

String.prototype.startsWith = function (str) { return (this.match("^" + str) == str) }

String.prototype.endsWith = function (str) { return (this.match(str + "$") == str) }
  alert(s);
   if (!stringEndsWithValidExtension($("[id*='Upload']").val(), [".png", ".jpeg", ".jpg", ".bmp"], false)) {
        alert("Photo only allows file types of PNG, JPG and BMP.");
        return false;
    }
    return true;
});
});

  </script>
</head>
<body>
Upload<input id='Upload' type="file" style="display:block;margin-top: -20px;opacity: 0;" >

<span id='spanFileName'></span>
</body>
</html>

这篇关于文件类型的onchange jQuery验证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！