Javascript按钮onclick函数未定义

Question

im currently using PhoneGap and for some reason when i click a button, the function is undefined. 我目前正在使用PhoneGap，出于某种原因，当我点击一个按钮时，该功能是未定义的。 iv tryed putting it inside the deviceReady function, as well as the document ready function, but neither seemed to make a difference. iv尝试将它放在deviceReady函数中，以及文档就绪函数，但似乎都没有区别。

I can't see what the problem is, if anyone can help that would be great. 我看不出有什么问题，如果有人能提供帮助那就太好了。

My HTML: 我的HTML：

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <meta name="format-detection" content="telephone=no" />
        <meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width, height=device-height, target-densitydpi=device-dpi" />
        <link rel="stylesheet" type="text/css" href="css/jquery.mobile-1.3.0.min.css" />
        <link rel="stylesheet" type="text/css" href="css/jquery.mobile.structure-1.3.0.min.css" />
        <link rel="stylesheet" type="text/css" href="css/jquery.mobile.theme-1.3.0.min.css" />
        <link rel="stylesheet" type="text/css" href="css/index.css" />
        <script type="text/javascript" src="cordova-2.5.0.js"></script>
        <script type="text/javascript" src="cordova.js"></script>
        <script type="text/javascript" src="phonegap.js"></script>
        <script type="text/javascript" src="js/libary.js"></script>
        <script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
        <script type="text/javascript" src="js/jquery.mobile-1.3.0.min.js"></script>
      <title>Libary</title>
    </head>
    <body>
      <div id="capture" class="wrapper" data-role="page">
        <div data-role="header">
          <h1>Libary</h1>
        </div>
        <div data-role="content" class="app">
          <a href="#" data-role="button" onclick="retrievePicture();">Retrieve Photo</a>
          <p id="pictureStatus"></p>
          <div id="imagelocation">
            <img id="capturedImage"></img>
          </div>
        </div>
      </div>
    </body>
</html>

My JavaScript/jQuery: 我的JavaScript / jQuery：

document.addEventListener("deviceready", onDeviceReady, false);
var platform;

function onDeviceReady() {
    //Find out what platform the device is running
    platform = device.platform;

    //Camera Section
    function retrievePicture() {
          // Take a picture using device camera and retrieve image
          //navigator.camera.getPicture(onCaptureSuccess, onCaptureFail, {Camera.sourceType = Camera.PictureSourceType.PHOTOLIBRARY});
            $('#pictureStatus').text("hello");
    }

    function onCaptureSuccess(imageData) {
        $('#capturedImage').css("display", "block");
        var imageLocation = imageData;
        $('#capturedImage').attr("src", imageLocation);
        $('#pictureStatus').text(imageLocation);
    }

    function onCaptureFail(message) {
        $('#pictureStatus').text(message);
    }
}

Answer 1

Please don't define functions inside functions like that. 请不要在这样的函数内定义函数。 Remove your retrievePicture() from inside the onDeviceReady() function and it should work fine. 从onDeviceReady()函数中删除你的retrievePicture() ，它应该可以正常工作。

As mentioned by @Robin van Baalen, this may be an interesting and relevant read - What you need to know about Javascript scoping . 正如@Robin van Baalen所提到的，这可能是一个有趣且相关的阅读 - 您需要了解的有关Javascript范围的知识。

Also, Functions and function scope . 另外，功能和功能范围。

Javascript按钮onclick函数未定义

问题描述

1 个解决方案

解决方案1
3 已采纳 2013-03-26 12:32:14

Javascript按钮onclick函数未定义

问题描述

1 个解决方案

解决方案1 3 已采纳 2013-03-26 12:32:14

解决方案1
3 已采纳 2013-03-26 12:32:14