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Ajax Packaged

try to pakage ajax by myself

optional paramas:

  • method:
    get(default)
    post
  • url
  • data:
    Allow Type: Object, FormData
  • dataType:
    Object(default) , auto translate to urldecode
    json
    file
  • async:
    true(default)
    false
  • showProgress:
    if dataType is “file” and this is a function, it will be called instantly
  • success:
    callback function while request successfully
    param: server responseText
  • fail:
    callback funciton while request failed

main function

function ajax(options){
    var opt = {
        method: "GET",
        async: true,
    }
    //if browser dosen't support Object.assign() you can define by yourself
    Object.assign(opt,options)
    if(!opt.url) return
    var XMLHttp = null
    if(XMLHttpRequest){
        XMLHttp = new XMLHttpRequest()
    }else{
        XMLHttp = new ActiveXObject("Microsoft.XMLHTTP")
    }
    //method: post
    if(!!opt.method && opt.method.toUpperCase() == "POST"){
        XMLHttp.open("POST",opt.url,opt.async)
        //dataType: json
        if(!!opt.dataType && opt.dataType.toUpperCase() == "JSON"){
            opt.postData = JSON.stringify(opt.data)
            XMLHttp.setRequestHeader("Content-Type","application/json")
            XMLHttp.send(opt.postData)
        }
        //dataType: file
        else if(!!opt.dataType && opt.dataType.toUpperCase() == "FILE"){
            XMLHttp.send(opt.data)
        }
        //dataType: Object
        else{
            var param = []
            for(var key in opt.data){
                if(opt.data.hasOwnProperty(key)){
                    param.push(key+"="+opt.data[key])
                }
            }
            opt.postData = param.join('&')
            var urlparams = opt.url.slice(opt.url.indexOf('?')+1)
            if(urlparams.indexOf('?') == -1){
                opt.postData.concat('&'+urlparams)
            }
            XMLHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;charset=utf-8')
            XMLHttp.send(opt.postData)
        }
    }
    //method: get
    else if(opt.method.toUpperCase() === "GET"){
        var params = []
        if(!!opt.data){
            for(var key in opt.data){
                if(opt.data.hasOwnProperty(key)){
                    params.push(key + '=' + opt.data[key])
                }
            }
            opt.postData = params.join('&')
        }
        if(!!opt.postData){
            opt.url.concat('&'+opt.postData)
        }
        XMLHttp.open('GET',opt.url,opt.async)
        XMLHttp.send()
    }
    //handle response
    if(!!opt.dataType && opt.dataType.toUpperCase() == "FILE" && typeof opt.showProgress == "function"){
        if("onprogress" in (new XMLHttpRequest)){
            XMLHttp.onprogress = function(e){
                if(e.lengthComputable){
                    var percent = Math.round(100*e.loaded/e.total)+"%"
                    opt.showProgress(percent)
                }
            }
            XMLHttp.onload = function(){
                var MSG = JSON.parse(request.responseText);
                opt.success(MSG)
            }
        }else{
            XMLHttp.onreadystatechange = function(){
                if(XMLHttp.readyState == 4){
                    if(XMLHttp.status == 200){
                        var res = XMLHttp.responseText
                        try{
                            res = JSON.parse(res)
                        }catch(e){
                            console.warn(e)
                        }
                        return !!opt.success?opt.success(res):null
                    }else{
                        return !!opt.fail?opt.fail(XMLHttp.status,XMLHttp.statusText):null
                    }
                }
            }
        }
    }else{
        XMLHttp.onreadystatechange = function(){
            if(XMLHttp.readyState == 4){
                if(XMLHttp.status == 200){
                    var res = XMLHttp.responseText
                    try{
                        res = JSON.parse(res)
                    }catch(e){
                        console.warn(e)
                    }
                    return !!opt.success?opt.success(res):null
                }else{
                    return !!opt.fail?opt.fail(XMLHttp.status,XMLHttp.statusText):null
                }
            }
        }
    }
}

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