Pasek postępu przesyłania plików z jQuery

Próbuję zaimplementować funkcję przesyłania plików AJAX w moim projekcie. Używam do tego jQuery; mój kod przesyła dane za pomocą AJAX. Chcę również zaimplementować pasek postępu przesyłania plików. W jaki sposób mogę to zrobić? Czy jest jakiś sposób, aby obliczyć, ile zostało już przesłane, abym mógł obliczyć procent przesłanych plików i utworzyć pasek postępu?

Uwaga: to pytanie dotyczy wtyczki formularza jQuery . Jeśli szukasz czystego rozwiązania jQuery, zacznij tutaj . Nie ma ogólnego rozwiązania jQuery dla wszystkich przeglądarek. Musisz więc użyć wtyczki. Używam dropzone.js , które mają łatwą rezerwę dla starszych przeglądarek. Wybór wtyczki zależy od Twoich potrzeb. Istnieje wiele dobrych postów porównawczych.

Z przykładów :

jQuery:

$(function() {

    var bar = $('.bar');
    var percent = $('.percent');
    var status = $('#status');

    $('form').ajaxForm({
        beforeSend: function() {
            status.empty();
            var percentVal = '0%';
            bar.width(percentVal);
            percent.html(percentVal);
        },
        uploadProgress: function(event, position, total, percentComplete) {
            var percentVal = percentComplete + '%';
            bar.width(percentVal);
            percent.html(percentVal);
        },
        complete: function(xhr) {
            status.html(xhr.responseText);
        }
    });
}); 

html:

<form action="file-echo2.php" method="post" enctype="multipart/form-data">
    <input type="file" name="myfile"><br>
    <input type="submit" value="Upload File to Server">
</form>

<div class="progress">
    <div class="bar"></div >
    <div class="percent">0%</div >
</div>

<div id="status"></div>

musisz stylizować pasek postępu za pomocą css ...

Zrobiłem to tylko z jQuery:

$.ajax({
  xhr: function() {
    var xhr = new window.XMLHttpRequest();

    xhr.upload.addEventListener("progress", function(evt) {
      if (evt.lengthComputable) {
        var percentComplete = evt.loaded / evt.total;
        percentComplete = parseInt(percentComplete * 100);
        console.log(percentComplete);

        if (percentComplete === 100) {

        }

      }
    }, false);

    return xhr;
  },
  url: posturlfile,
  type: "POST",
  data: JSON.stringify(fileuploaddata),
  contentType: "application/json",
  dataType: "json",
  success: function(result) {
    console.log(result);
  }
});

W moim projekcie wykorzystałem następujące elementy. Ty też możesz spróbować.

ajax = new XMLHttpRequest();
ajax.onreadystatechange = function () {

    if (ajax.status) {

        if (ajax.status == 200 && (ajax.readyState == 4)){
            //To do tasks if any, when upload is completed
        }
    }
}
ajax.upload.addEventListener("progress", function (event) {

    var percent = (event.loaded / event.total) * 100;
    //**percent** variable can be used for modifying the length of your progress bar.
    console.log(percent);

});

ajax.open("POST", 'your file upload link', true);
ajax.send(formData);
//ajax.send is for uploading form data.

sprawdź to: http://hayageek.com/docs/jquery-upload-file.php Znalazłem to przypadkowo w sieci.

Jeśli korzystasz z jquery w swoim projekcie i nie chcesz implementować mechanizmu uploadu od podstaw, możesz skorzystać z https://github.com/blueimp/jQuery-File-Upload .

Mają bardzo ładny interfejs API z możliwością wyboru wielu plików, obsługą przeciągania i upuszczania, paskiem postępu, obrazami walidacji i podglądu, obsługą wielu domen, przesyłaniem plików podzielonych na fragmenty i wznowień. I mają przykładowe skrypty dla wielu języków serwera (node, php, python i go).

Adres URL wersji demonstracyjnej: https://blueimp.github.io/jQuery-File-Upload/ .

Oto bardziej kompletne użycie jquery 1.11.x $ .ajax ():

<script type="text/javascript">
    function uploadProgressHandler(event) {
        $("#loaded_n_total").html("Uploaded " + event.loaded + " bytes of " + event.total);
        var percent = (event.loaded / event.total) * 100;
        var progress = Math.round(percent);
        $("#uploadProgressBar").html(progress + " percent na ang progress");
        $("#uploadProgressBar").css("width", progress + "%");
        $("#status").html(progress + "% uploaded... please wait");
    }

    function loadHandler(event) {
        $("#status").html(event.target.responseText);
        $("#uploadProgressBar").css("width", "0%");
    }

    function errorHandler(event) {
        $("#status").html("Upload Failed");
    }

    function abortHandler(event) {
        $("#status").html("Upload Aborted");
    }

    $("#uploadFile").click(function (event) {
        event.preventDefault();
        var file = $("#fileUpload")[0].files[0];
        var formData = new FormData();
        formData.append("file1", file);

        $.ajax({
            url: 'http://testarea.local/UploadWithProgressBar1/file_upload_parser.php',
            method: 'POST',
            type: 'POST',
            data: formData,
            contentType: false,
            processData: false,
            xhr: function () {
                var xhr = new window.XMLHttpRequest();
                xhr.upload.addEventListener("progress",
                    uploadProgressHandler,
                    false
                );
                xhr.addEventListener("load", loadHandler, false);
                xhr.addEventListener("error", errorHandler, false);
                xhr.addEventListener("abort", abortHandler, false);

                return xhr;
            }
        });
    });
</script>

To rozwiązało mój problem

$.ajax({
  xhr: function() {
    var xhr = new window.XMLHttpRequest();

    xhr.upload.addEventListener("progress", function(evt) {
      if (evt.lengthComputable) {
        var percentComplete = evt.loaded / evt.total;
        percentComplete = parseInt(percentComplete * 100);
var $link = $('.'+ids);
          var $img = $link.find('i'); 
          $link.html('Uploading..('+percentComplete+'%)');
          $link.append($img);
      }
    }, false);

    return xhr;
  },
  url: posturlfile,
  type: "POST",
  data: JSON.stringify(fileuploaddata),
  contentType: "application/json",
  dataType: "json",
  success: function(result) {
    console.log(result);
  }
});

Odpowiedź Kathira jest świetna, ponieważ rozwiązuje ten problem za pomocą samego jQuery. Chciałem tylko dodać kilka dodatków do jego odpowiedzi, aby pracować z jego kodem z pięknym paskiem postępu HTML:

$.ajax({
xhr: function() {
var xhr = new window.XMLHttpRequest();

xhr.upload.addEventListener("progress", function(evt) {
  if (evt.lengthComputable) {
    var percentComplete = evt.loaded / evt.total;
    percentComplete = parseInt(percentComplete * 100);

    $('.progress-bar').width(percentComplete+'%');
    $('.progress-bar').html(percentComplete+'%');

  }
}, false);

return xhr;
},
url: posturlfile,
type: "POST",
data: JSON.stringify(fileuploaddata),
contentType: "application/json",
dataType: "json",
success: function(result) {
console.log(result);
}
});

Oto kod HTML paska postępu, użyłem Bootstrap 3 dla elementu paska postępu:

<div class="progress" style="display:none;">
<div class="progress-bar progress-bar-success progress-bar-striped 
active" role="progressbar"
aria-valuemin="0" aria-valuemax="100" style="width:0%">
0%
</div>
</div>

JavaScript:

<script>
/* jquery.form.min.js */
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t={};t.fileapi=e("<input type='file'/>").get(0).files!==undefined;t.formdata=window.FormData!==undefined;var n=!!e.fn.prop;e.fn.attr2=function(){if(!n){return this.attr.apply(this,arguments)}var e=this.prop.apply(this,arguments);if(e&&e.jquery||typeof e==="string"){return e}return this.attr.apply(this,arguments)};e.fn.ajaxSubmit=function(r){function k(t){var n=e.param(t,r.traditional).split("&");var i=n.length;var s=[];var o,u;for(o=0;o<i;o++){n[o]=n[o].replace(/\+/g," ");u=n[o].split("=");s.push([decodeURIComponent(u[0]),decodeURIComponent(u[1])])}return s}function L(t){var n=new FormData;for(var s=0;s<t.length;s++){n.append(t[s].name,t[s].value)}if(r.extraData){var o=k(r.extraData);for(s=0;s<o.length;s++){if(o[s]){n.append(o[s][0],o[s][1])}}}r.data=null;var u=e.extend(true,{},e.ajaxSettings,r,{contentType:false,processData:false,cache:false,type:i||"POST"});if(r.uploadProgress){u.xhr=function(){var 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zero elements found by selector"+(e.isReady?"":" (DOM not ready)"));return this}if(t.delegation){e(document).off("submit.form-plugin",this.selector,r).off("click.form-plugin",this.selector,i).on("submit.form-plugin",this.selector,t,r).on("click.form-plugin",this.selector,t,i);return this}return this.ajaxFormUnbind().bind("submit.form-plugin",t,r).bind("click.form-plugin",t,i)};e.fn.ajaxFormUnbind=function(){return this.unbind("submit.form-plugin click.form-plugin")};e.fn.formToArray=function(n,r){var i=[];if(this.length===0){return i}var s=this[0];var o=this.attr("id");var u=n?s.getElementsByTagName("*"):s.elements;var a;if(u&&!/MSIE [678]/.test(navigator.userAgent)){u=e(u).get()}if(o){a=e(':input[form="'+o+'"]').get();if(a.length){u=(u||[]).concat(a)}}if(!u||!u.length){return i}var f,l,c,h,p,d,v;for(f=0,d=u.length;f<d;f++){p=u[f];c=p.name;if(!c||p.disabled){continue}if(n&&s.clk&&p.type=="image"){if(s.clk==p){i.push({name:c,value:e(p).val(),type:p.type});i.push({name:c+".x",value:s.clk_x},{name:c+".y",value:s.clk_y})}continue}h=e.fieldValue(p,true);if(h&&h.constructor==Array){if(r){r.push(p)}for(l=0,v=h.length;l<v;l++){i.push({name:c,value:h[l]})}}else if(t.fileapi&&p.type=="file"){if(r){r.push(p)}var m=p.files;if(m.length){for(l=0;l<m.length;l++){i.push({name:c,value:m[l],type:p.type})}}else{i.push({name:c,value:"",type:p.type})}}else if(h!==null&&typeof h!="undefined"){if(r){r.push(p)}i.push({name:c,value:h,type:p.type,required:p.required})}}if(!n&&s.clk){var g=e(s.clk),y=g[0];c=y.name;if(c&&!y.disabled&&y.type=="image"){i.push({name:c,value:g.val()});i.push({name:c+".x",value:s.clk_x},{name:c+".y",value:s.clk_y})}}return i};e.fn.formSerialize=function(t){return e.param(this.formToArray(t))};e.fn.fieldSerialize=function(t){var n=[];this.each(function(){var r=this.name;if(!r){return}var i=e.fieldValue(this,t);if(i&&i.constructor==Array){for(var s=0,o=i.length;s<o;s++){n.push({name:r,value:i[s]})}}else if(i!==null&&typeof i!="undefined"){n.push({name:this.name,value:i})}});return e.param(n)};e.fn.fieldValue=function(t){for(var n=[],r=0,i=this.length;r<i;r++){var s=this[r];var o=e.fieldValue(s,t);if(o===null||typeof o=="undefined"||o.constructor==Array&&!o.length){continue}if(o.constructor==Array){e.merge(n,o)}else{n.push(o)}}return n};e.fieldValue=function(t,n){var r=t.name,i=t.type,s=t.tagName.toLowerCase();if(n===undefined){n=true}if(n&&(!r||t.disabled||i=="reset"||i=="button"||(i=="checkbox"||i=="radio")&&!t.checked||(i=="submit"||i=="image")&&t.form&&t.form.clk!=t||s=="select"&&t.selectedIndex==-1)){return null}if(s=="select"){var o=t.selectedIndex;if(o<0){return null}var u=[],a=t.options;var f=i=="select-one";var l=f?o+1:a.length;for(var c=f?o:0;c<l;c++){var h=a[c];if(h.selected){var p=h.value;if(!p){p=h.attributes&&h.attributes.value&&!h.attributes.value.specified?h.text:h.value}if(f){return p}u.push(p)}}return u}return e(t).val()};e.fn.clearForm=function(t){return this.each(function(){e("input,select,textarea",this).clearFields(t)})};e.fn.clearFields=e.fn.clearInputs=function(t){var n=/^(?:color|date|datetime|email|month|number|password|range|search|tel|text|time|url|week)$/i;return this.each(function(){var r=this.type,i=this.tagName.toLowerCase();if(n.test(r)||i=="textarea"){this.value=""}else if(r=="checkbox"||r=="radio"){this.checked=false}else if(i=="select"){this.selectedIndex=-1}else if(r=="file"){if(/MSIE/.test(navigator.userAgent)){e(this).replaceWith(e(this).clone(true))}else{e(this).val("")}}else if(t){if(t===true&&/hidden/.test(r)||typeof t=="string"&&e(this).is(t)){this.value=""}}})};e.fn.resetForm=function(){return this.each(function(){if(typeof this.reset=="function"||typeof this.reset=="object"&&!this.reset.nodeType){this.reset()}})};e.fn.enable=function(e){if(e===undefined){e=true}return this.each(function(){this.disabled=!e})};e.fn.selected=function(t){if(t===undefined){t=true}return this.each(function(){var n=this.type;if(n=="checkbox"||n=="radio"){this.checked=t}else if(this.tagName.toLowerCase()=="option"){var r=e(this).parent("select");if(t&&r[0]&&r[0].type=="select-one"){r.find("option").selected(false)}this.selected=t}})};e.fn.ajaxSubmit.debug=false})
</script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#myform').on('change', '.wpcf7-file', function (e) {
                e.preventDefault();
                var myParent = $(this).parent();
                var filname= $('input[type=file]').val()

                if (filname) { 
                $(this).parent().find('#progress-div').show();          
                $('#myform').ajaxSubmit({
                    // target: '#progress-div123',/**********only for response************/
                    beforeSubmit: function () {
                        myParent.find('#progress-bar').width('0%');
                    },
                    uploadProgress: function (event, position, total, percentComplete) {
                        myParent.find('#progress-bar').width(percentComplete + '%');
                        myParent.find('#progress-bar').html('<div id="progress-status">' + percentComplete + ' %</div>')
                    },
                    success: function showResponse(responseText, statusText, xhr, $form) {

                        //myParent.find('#progress-div').hide(10000);
                    },
                    resetForm: false
                });

                }
                return false;
            });


           /***********Error msg if file not valid***************/
                $('input[type=file]').change(function () {
                var val = $(this).val().toLowerCase();
                var regex = new RegExp("(.*?)\.(pdf|txt|jpg|png|doc|docx|xlx|xls|xlsx|jpg|ppt|pptx|tif|tiff|\n\
                bmp|pcd|gif|bmp|zip|rar|odt|avi|ogg|m4a|mov|mp3|mp4|mpg|wav|wmv|stp|sldprt|sldasm|iges|igs|stl|x_t|step\n\
                |stp|prt|asm|idw|iam|ipt|dxf|dwg|pdf|slddrw|dwf)$");
                if (!(regex.test(val))) {
                    $(this).val('');
                    alert('Please select correct file format');
                }
                });
            /*********End*****************/

        });
</script>

Style:

<style>
    body{width:610px;}
    #uploadForm {border-top:#F0F0F0 2px solid;background:#FAF8F8;padding:10px;}
    #uploadForm label {margin:2px; font-size:1em; font-weight:bold;}
    .demoInputBox{padding:5px; border:#F0F0F0 1px solid; border-radius:4px; background-color:#FFF;}
    #progress-bar {background-color: #12CC1A;height:20px;color: #FFFFFF;width:0%;-webkit-transition: width .3s;-moz-transition: width .3s;transition: width .3s;}
    .btnSubmit{background-color:#09f;border:0;padding:10px 40px;color:#FFF;border:#F0F0F0 1px solid; border-radius:4px;}
    #progress-div
    {
        border: 1px solid #0fa015;
        border-radius: 4px;
        margin: -35px 2px 7px 295px;
        padding: 5px 0;
        text-align: center;
        width: 277px;
    }

    #targetLayer{width:100%;text-align:center;}
</style>