[英]jquery & ajax uploading images twice
我有一個jQuery腳本通過ajax上傳圖像,但我注意到由於某種原因,它兩次上傳圖像。 在ajax步驟中,然后將它們作為隱藏值嵌入到表單中,然后當有人單擊提交表單時,上載過程將再次開始,但實際上不應該這樣做,因為圖像已經在服務器上了。 我看到它是因為我使用的是Chrome,當我單擊“提交”時,它再次在左下角顯示“正在上傳(19%)..”等。 這不是我的腳本,我真的對jQuery很不好,所以我不知道出了什么問題。 這里是否有明顯的東西可以使它在提交時再次上傳?
function media_sync(form_name, media_type, file_path, file_url, file_embed, nb_uploads, max_uploads, upload_id) {
var radio_buttons = [];
for (var i = 0; i < form_name.length; i++) {
if (form_name.elements[i].type == 'radio' && form_name.elements[i].checked == true) {
radio_buttons[form_name.elements[i].name] = form_name.elements[i].value;
}
}
var jsHttp = new JsHttpRequest();
var xmlHttp = GetXmlHttpObject();
if (jsHttp == null) {
alert("Browser does not support HTTP Request");
return;
}
var media_name = '';
switch (media_type) {
case 1:
media_name = 'ad_image';
break;
case 2:
media_name = 'ad_video';
break;
case 3:
media_name = 'ad_dd';
break;
}
var media_box_name = 'display_media_boxes_' + media_name;
file_embed = base64Encode(file_embed);
var url = relative_path + 'file_upload.php';
var action = url + '?do=add&media_type=' + media_type + '&file_url=' + file_url +
'&file_embed=' + file_embed + '&nb_uploads=' + nb_uploads + '&upload_id=' + upload_id;
var thumbnail_div = document.getElementById('display_media_boxes_' + media_name);
var new_content = document.createElement('div');
if (file_embed != '') {
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4) {
var response = xmlHttp.responseText;
var results = response.split('|');
if (results[5] != '') {
alert(results[5]);
}
else {
new_content.innerHTML = results[3];
while (new_content.firstChild) {
thumbnail_div.appendChild(new_content.firstChild);
}
var hidden_div = document.getElementById('hidden_media_boxes');
var hidden_content = document.createElement('div');
hidden_content.innerHTML = '<input type="hidden" name="' + results[1] + '[]" id="hidden_' + results[2] + '" value="' + results[4] + '">';
while (hidden_content.firstChild) {
hidden_div.appendChild(hidden_content.firstChild);
}
nb_uploads++;
}
document.getElementById('item_file_url_' + media_type).value = '';
document.getElementById('item_file_embed_' + media_type).value = '';
if (nb_uploads >= max_uploads) {
document.getElementById('btn_upload_' + media_type).disabled = true;
document.getElementById('item_file_upload_' + media_type).disabled = true;
document.getElementById('item_file_url_' + media_type).disabled = true;
document.getElementById('item_file_embed_' + media_type).disabled = true;
}
document.getElementById('nb_uploads_' + media_type).value = nb_uploads;
}
};
xmlHttp.open("POST", action, true);
xmlHttp.send(null);
}
else {
jQuery.blockUI({
message: $('#uploading_image'),
css: {
top: '20%',
left: ($(window).width() - 400) /2 + 'px',
width: '400px'
}
});
var image_loading = document.createElement('div');
image_loading.innerHTML = '';
thumbnail_div.appendChild(image_loading);
jsHttp.onreadystatechange = function() {
if (jsHttp.readyState == 4) {
var response = jsHttp.responseText;
var results = response.split('|');
if (results[5] != '') {
alert(results[5]);
thumbnail_div.removeChild(image_loading);
setTimeout(jQuery.unblockUI, 500);
}
else {
new_content.innerHTML = results[3];
while (new_content.firstChild) {
thumbnail_div.replaceChild(new_content.firstChild, image_loading);
}
setTimeout(jQuery.unblockUI, 500);
var hidden_div = document.getElementById('hidden_media_boxes');
var hidden_content = document.createElement('div');
hidden_content.innerHTML = '<input type="hidden" name="' + results[1] + '[]" id="hidden_' + results[2] + '" value="' + results[4] + '">';
while (hidden_content.firstChild) {
hidden_div.appendChild(hidden_content.firstChild);
}
nb_uploads++;
}
document.getElementById('item_file_url_' + media_type).value = '';
document.getElementById('item_file_embed_' + media_type).value = '';
if (nb_uploads >= max_uploads) {
document.getElementById('btn_upload_' + media_type).disabled = true;
document.getElementById('item_file_upload_' + media_type).disabled = true;
document.getElementById('item_file_url_' + media_type).disabled = true;
document.getElementById('item_file_embed_' + media_type).disabled = true;
}
document.getElementById('nb_uploads_' + media_type).value = nb_uploads;
for (var i = 0; i < form_name.length; i++) {
if (form_name.elements[i].type == 'radio' && radio_buttons[form_name.elements[i].name] == form_name.elements[i].value) {
form_name.elements[i].checked = true;
}
}
}
};
jsHttp.open("POST", action, true);
jsHttp.send({file: file_path});
}
jQuery('#upload_form').attr('target', '_self');
}
HTML表單非常基本,帶有一堆隱藏值字段,它們只是變量和圖像上載部分,如下所示:
<form id="upload_form" action="new.php" method="post" enctype="multipart/form-data" name="ad_create_form">
<input class="upload_button" type="file" name="item_file_upload_1" id="item_file_upload_1"
onchange="media_sync(ad_create_form, 1,
this.form.item_file_upload_1,
document.getElementById('item_file_url_1').value,
document.getElementById('item_file_embed_1').value,
document.getElementById('nb_uploads_1').value,
5,
'000000015');" />
<input name="finish" id="finish" value="Add" type="submit" class="btn">
</form>
非常感謝任何人都可以找出原因所在! :)
您有一個“ onchange”,它會觸發media_sync函數,然后該函數運行Ajax來發布數據。 然后,您還可以讓表單本身提交數據。 這就是為什么它要上傳兩次,一次上傳到Ajax,一次上傳到表單。 您需要選擇一個而不是同時使用兩者。 我不確定要使用哪一個,這取決於您希望頁面如何工作。 我的猜測是,Ajax就足夠了,因此刪除表單提交(因為表單中唯一的東西還是一個輸入)。
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