'$'是未定义JavaScript错误 [英] '$' is undefined javascript error

问题描述

<script type="text/javascript">
    $(function() {
        $('#WaterMark').draggable(
                    {
                        start: function(e, ui) {
                        },
                        cursor: 'move',
                        zIndex: 2700,
                        revert: 'invalid',
                        containment: '#OriginalImageContainer'
                    });
        $('#OriginalImage').droppable({
            hoverClass: 'DroppableOver',
            drop: InitializeWaterMark
        })
    });

    var InitializeWaterMark = function() {
        var position = $('#WaterMark').position();
        var imgPosition = $('#OriginalImageContainer').position();
        document.getElementById('xpos').value = position.left - imgPosition.left;
        document.getElementById('ypos').value = position.top - imgPosition.top;

    }
    </script>

这是JavaScript的$ C $词得到了关于在asp.net网页拖拽和图像的降采样...但它返回一个错误，指出$未定义 ..请帮助我出去

this is a sample javascript code i got regarding drag and drop of images in a asp.net webpage...But it returns a error stating '$' is undefined..please help me out

推荐答案

在猜测，我说你失踪的库来支持脚本（可能是jQuery的）。

At a guess, I'd say you were missing the library to support that script (probably jQuery).

您需要在为了得到你正在寻找的可拖动功能的JavaScript框架的引用。

You need to include a reference to the JavaScript framework in order to get the draggable functionality you're looking for.

尝试添加以下到您的网页（之前在您的示例脚本块）：

Try adding the following to your page (before the script block in your example):

<script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.7.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.10/jquery-ui.js"></script>

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