从JavaScript打开图像文件（不适用于手机）

Question

I am trying to open image files using JavaScript. 我正在尝试使用JavaScript打开图像文件。 It works successfully on Chrome (showing no errors), but the image refuses to show on my iPhone. 它可以在Chrome上成功运行（没有显示错误），但是该图像拒绝在我的iPhone上显示。 Is this because the image is too large (like the DATA url is too long)? 这是因为图片太大（例如DATA网址太长）吗？

My code uses FileReader, gets the img.src, and outputs it as an img tag as shown below: 我的代码使用FileReader，获取img.src，并将其输出为img标签，如下所示：

 if(window.FileReader) { //do this $('input').change(function() { $("#result").html("SELECTING IMAGE ... ... ..."); var fr = new FileReader; fr.onload = function() { var img = new Image; img.onload = function() { //I loaded the image and have complete control over all attributes, like width and src, which is the purpose of filereader. $.ajax({url: img.src, async: true, success: function(result){ $("#result").html("<img src='ajax-loader.gif' />"); setTimeout(function(){ $("#result").html("<img src='" + img.src + "' /> <br/> <br/>" + "<a href='" + img.src + "'>View in browser</a>"); console.log("Finished reading Image");document.getElementById('iPUT').style.opacity=0.01; }, 1000); }}); }; img.src = fr.result; }; fr.readAsDataURL(this.files[0]); }); } else { alert("You don't support FileReader"); }

 <html><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> <link rel="icon" href="/favicon.ico" type="image/x-icon"> <title>iViewr</title> <!-- The style.css file allows you to change the look of your web pages. If you include the next line in all your web pages, they will all share the same look. This makes it easier to make new pages for your site. --> <link href="/style.css" rel="stylesheet" type="text/css" media="all"> </head> <body cz-shortcut-listen="true"> <div onclick="document.getElementById('iPUT').style.opacity=0.01"> <button onclick="document.getElementById('result').style.zoom=0.5;this.blur();">Zoom out</button> <button onclick="document.getElementById('result').style.zoom=1.0;this.blur();">Zoom normal</button> <button onclick="document.getElementById('result').style.zoom=1.5;this.blur();">Zoom in</button> <br> </div> <div id="inputDIV" onclick="document.getElementById('iPUT').style.opacity=0.5"><input type="file" id="iPUT" accept="image/*" capture="camera" style="opacity: 0.5;"></div> <div id="result">Please choose a file to view it.</div> <script src="index.js"></script> </body></html>

You can see it in action here at: http://iviewr.neocities.org/ 您可以在以下位置查看它的运行情况： http : //iviewr.neocities.org/

Thanks in advance! 提前致谢！

Answer 1

Use the URL.createObjectURL() on the file chosen by the input, as shown below. 在输入选择的文件上使用URL.createObjectURL（），如下所示。 Credits to @dandavis. 致谢@dandavis。

 $('input').change(function(){ var resultPreview = document.getElementById('result'); var file = document.querySelector('input[type=file]').files[0]; //selects the very first file var fr = new FileReader(); fr.addEventListener('load', function(){ //once the FileReader is loaded, resultPreview.src = fr.result; console.log("Finished reading Image");document.getElementById('iPUT').style.opacity=0.01; document.getElementById('help').innerHTML="You can choose another image by tapping the screen again."; }, false); if (file){ //if there even is a first file fr.readAsDataURL(file); //don't want to mess with Data URLs!! this calls the function above } });

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script> <link rel="icon" href="/favicon.ico" type="image/x-icon"> <title>iViewr</title> <!-- The style.css file allows you to change the look of your web pages. If you include the next line in all your web pages, they will all share the same look. This makes it easier to make new pages for your site. --> <link href="/style.css" rel="stylesheet" type="text/css" media="all"> </head> <body> <div onclick="document.getElementById('iPUT').style.opacity=0.01"> <button onclick="document.getElementById('result').style.zoom=0.5;this.blur();">Zoom out</button> <button onclick="document.getElementById('result').style.zoom=1.0;this.blur();">Zoom normal</button> <button onclick="document.getElementById('result').style.zoom=1.5;this.blur();">Zoom in</button> <br /> </div> <div id='help'>Tap the middle of the screen to select an image for the computer to guess.</div> <div id='inputDIV' onclick="document.getElementById('iPUT').style.opacity=0.5"><input type="file" id='iPUT' accept="image/*" capture="camera"></div> <img id='result' src=''/> <script src='index.js'></script> </body> </html>

从JavaScript打开图像文件（不适用于手机）

问题描述

1 个解决方案

解决方案1
1 已采纳 2016-01-18 15:36:57

从JavaScript打开图像文件（不适用于手机）

问题描述

1 个解决方案

解决方案1 1 已采纳 2016-01-18 15:36:57

解决方案1
1 已采纳 2016-01-18 15:36:57