简体   繁体   English

来自Google CDN的jQuery无法正常工作

[英]jQuery from google CDN is not working

I want to use jQuery in my webpage. 我想在我的网页中使用jQuery。 I don't want to download it, so I am including it from Google's CDN. 我不想下载它,所以我从Google的CDN中包含了它。

When I run the page, the jQuery is not working. 当我运行页面时,jQuery无法正常工作。

Can anyone tell me whether the problem relies in jQuery or in my code. 谁能告诉我问题出在jQuery还是我的代码中。

Here is my code. 这是我的代码。

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> 
<script>
cars=new Array("Mercedes","Volvo","BMW","porche");
phones=new Array('Samsung','Nokia','Iphone');

populateSelect();

$(function() {

  $('#cat').change(function(){
    populateSelect();
});

});


function populateSelect(){
cat=$('#cat').val();
$('#item').html('');


if(cat=='car'){
    cars.forEach(function(t) { 
        $('#item').append('<option>'+t+'</option>');
    });
}

if(cat=='phone'){
    phones.forEach(function(t) {
        $('#item').append('<option>'+t+'</option>');
    });
}

} 
</script>
</head>

<body>
<select id="cat">
<option value="car">car</option>
<option value="phone">phone</option>
</select>

<select id="item">

</select>
</body>
</html>

You call populateSelect() which tries to access your select tag when the DOM hasn't even loaded yet. 您调用populateSelect(),当DOM尚未加载时,它尝试访问您的选择标签。

Move the function call into your DOM Ready event handler: 将函数调用移到DOM Ready事件处理程序中:

$(function() {
  populateSelect();

  $('#cat').change(function(){
    populateSelect();
  });
});

The next time, open your browser's developer console ! 下次,打开浏览器的开发人员控制台 It will clearly show the error. 它将清楚地显示错误。

声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM