我已經花了大部分時間來包裝我的頭。我有兩種觸發同一事件的方法。 1.通過點擊輸入文件選擇器或 2.通過將文件拖放到「拖放區」我如何寫入兩個幾乎相同的JavaScript函數到一個,基於addEventListener的屁股觸發器
事件之間的唯一區別是文件API使用不同的方法。 並且似乎在eventListeners函數調用中允許的唯一參數是(event)。我可能錯過了一些東西,但任何幫助,非常感謝
但它真的很煩人,只是複製粘貼幾乎相同的代碼。有沒有辦法將這兩個函數「fileSelect(event)和dropSelect(event)」寫入一個?
的代碼:
function fileSelect(event){
event.stopPropagation();
event.preventDefault();
selectedFile = event.target.files[0]; //Uses ".files" from the file API in HTML5. In this case accessing info on a single file (files[0]).
//Insert file info
document.getElementById('filename').innerHTML = "filename: " + selectedFile.name;
document.getElementById('filetype').innerHTML = "filetype: " + selectedFile.type;
document.getElementById('filesize').innerHTML = "filesize: " + parseFloat(selectedFile.size/1024).toFixed(1) + " kb";
}
//parse the info from a drag'n'drop-selected image. WRITE THESE 2 FUNCTIONS INTO ONE!
function dropSelect(event){
event.stopPropagation();
event.preventDefault();
selectedFile = event.dataTransfer.files[0]; //Uses ".files" from the file API in HTML5. In this case accessing info on a single file (files[0]).
//Insert file info
document.getElementById('filename').innerHTML = "filename: " + selectedFile.name;
document.getElementById('filetype').innerHTML = "filetype: " + selectedFile.type;
document.getElementById('filesize').innerHTML = "filesize: " + parseFloat(selectedFile.size/1024).toFixed(1) + " kb";
}
//add onchange event to the file_select input:file. This will run function "fileSelect", onChange.
document.getElementById('file_select').addEventListener('change', fileSelect, false);
//start fileselect when drag'n'drop.
function handleDragOver(event){
event.stopPropagation();
event.preventDefault();
event.dataTransfer.dropEffect = 'copy';
}
document.getElementById('upload_box').addEventListener('dragover', handleDragOver, false);
document.getElementById('upload_box').addEventListener('drop', dropSelect, false);
+1屁股觸發。 – 2013-02-12 16:12:16
這是相同的方法:重構出不同的部分並將其傳遞給重構函數 - 它是一個獲取'selectedFile'的單個參數。 – 2013-02-12 16:13:10