js file download and naming

js file download; file download method; file download method in IE; download using IE; file download compatibility; a tag download; browser download

Function: realize file download by mainstream browsers Function;

Compatibility: >=IE10, Edge, chrome, firefox;

Request method with the background: GET request, url carries parameters url? id=123 (hiding the real path of the file);

The prerequisite for implementing the download function is to determine the browser type:

       browserType: function(){var userAgent = navigator.userAgent.toLowerCase();// Figure out what browser is being usedvar testCenter = {
                ie:function isIE() { //ie?if (!!window.ActiveXObject || "ActiveXObject" in window)return true;elsereturn false;
                },
                edge : ()=>{ return /dge/.test(userAgent) },
                chrome:()=>{ return /chrome/.test(userAgent)},
                safari: ()=>{  return /safari/.test(userAgent)&&!(/chrome/.test(userAgent))},
                opera: ()=>{  return  /opera/.test(userAgent) } ,
                msie: ()=>{  return /msie/.test(userAgent) && !/opera/.test(userAgent) },
                mozilla: ()=>{  return /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent) }
            };var browserObj = {};for(var k in testCenter){var result = testCenter[k]();var version = (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1];if(result){
                    browserObj.browser = k;
                    browserObj.version = version;return browserObj;
                }
            }
        },

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Download function definition: as follows

dlFile ： function(options) {var that = this;var url = options.url;
            url += "?" + $.param(options.data);   //这里也可以不用jqvar xhr = new XMLHttpRequest();        //发起请求xhr.open('get', url);
            xhr.responseType = 'blob';        //规定响应为流文件            xhr.send();
            xhr.onreadystatechange = function(){if (this.readyState == 4){if (this.status == '401' || this.status == '402') {                                     //在这里可以进行一些请求失败的处理                    }else if(this.status == 200) {var currentBrowserType = that.browserType();  //判断浏览器类型  见上述browserType函数；if(currentBrowserType.browser==='ie'&&(currentBrowserType.version == "10.0" || currentBrowserType.version == "11.0")){   //如果IE创建iframe对象来下载var href = window.URL.createObjectURL(this.response);var elemIF = document.createElement("iframe");
                                elemIF.src = "http://" + location.host + '/crowd-web/file/downloadFile?' + $.param(options.data);
                                elemIF.style.display = "none";
                                document.body.appendChild(elemIF);
                          }else if( currentBrowserType.browser==='edge'){ //如果edge使用h5的a标签的下载功能实现if (this.getResponseHeader("content-disposition")) {var fileName = decodeURI(this.getResponseHeader("content-disposition").replace("attachment;filename=", ""));
                                }var href = "http://" + location.host + '/crowd-web/file/downloadFile?' + $.param(options.data);var $dllink = $('<a href="&#39; + href + &#39;" download="&#39; + fileName + &#39;" ></a>').appendTo(document.body);
                                $dllink[0].click();
                                 window.URL.revokeObjectURL(href);
                        } else {  //其他现代浏览器采用H5的a标签新特性实现var href = window.URL.createObjectURL(this.response);if (this.getResponseHeader("content-disposition")) {var fileName = decodeURI(this.getResponseHeader("content-disposition").replace("attachment;filename=", ""));
                                }var $dllink = $('<a href="&#39; + href + &#39;" download="&#39; + fileName + &#39;" ></a>').appendTo(document.body);                             //initMouseEvent已经被放弃，直接使用a标签的dom节点click功能触发点击//var event = document.createEvent("MouseEvents");//event.initMouseEvent(//    "click", true, false, window, 0, 0, 0, 0, 0//    , false, false, false, false, 0, null//);//$dllink[0].dispatchEvent(event);$dllink[0].click();

                            window.URL.revokeObjectURL(href); //告诉浏览器可以释放该路径                        }
                    }
                }
            };
        },

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Download Function call: as follows

(The above methods are all defined in the global object tools, and can also be written in the way you need)

 tools.dlFile({
                    data : {"fileId":item.id},
                    url :config.URL.downLoad,
                    contentType : "application/json;chartset=utf-8",
                })

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Related knowledge points:

The best method to download files: blog post;

New method using H5 a tag Features: Blog post;

Blob object and createObjectURL and revokeObjectURL methods: Blog post;

Question:

a tag simulates click event: Can you guess that the following code can trigger page transfer?

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></head><body><a href="http://www.baidu.com" id="hehe">百度</a><button>跳到百度</button><script src="bower_components/jquery/dist/jquery.js?1.1.11"></script><script>$("button").click(function(){
         alert(123)
         $("#hehe").click();
    })</script></body></html>

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