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[英]Load text from local .txt file into html textarea using JavaScript
[英]local html load txt file
所以我正在使用本地html和javascript文件作為視頻文件的gui。 這幾乎是我的服務器index.php的外賣版本,它們可以在其他地方使用。 一切正常,但我正在嘗試從txt文件加載內容。 我的網絡服務器使用XMLHttpRequest來檢索它,因為它是服務器端。 但是由於外賣版本不在服務器上,因此文本文件與html文件位於同一本地目錄中
function loadBookmarks(){
var infoDoc = new XMLHttpRequest()
infoDoc.open("GET","info.bk");
infoDoc.send();
infoDoc.onreadystatechange = function() {
if (infoDoc.readyState== 4 && infoDoc.status == 200) {
document.getElementById("bookmarks").querySelector('p').innerHTML = infoDoc.responseText;
document.getElementById("infoButton").style.backgroundColor = "#119933";
} else {
document.getElementById("bookmarks").querySelector('p').innerHTML = "";
document.getElementById("infoButton").style.backgroundColor = "#993333"
}
}
}
那就是我正在使用的功能。 還有另一種方法可以使用非服務器離線javascript文件從文件中獲取文本嗎?
米切爾
這是一種解決方法,涉及一些約束,但根據您的目標,可能會滿足您的需求。 或不。
AFAIK您將無法使用XmlHttpRequest實現此目的,但可以使用FileReader加載文件。 您可以在此SO中找到一個有效的示例
缺點是FileReader必須從手動交互中觸發。 因此,如果沒有用戶(YOU)單擊並瀏覽要加載的文件,您將無法加載文件。
你能應付嗎?
如果是這樣,那就更糟了,因為一旦加載完畢,只需將文件內容放入localeStorage中即可,因此下次加載頁面或刷新頁面時,文件中的數據可能來自localeStorage ,您無需手動選擇要再次加載的文件。 當然,如果文件已更改,但您不在服務器/ Web服務器上,則文件自動更改的可能性很小。 因此,我想如果您必須手動更改文件,則還可以接受另一種手動干預。
https://developer.mozilla.org/zh-CN/docs/Web/API/Window/localStorage
如果還不是您的選擇,請考慮在文件和localeStorage中使用JSON格式的文本,它可以簡化您的數據轉換。
[編輯]當然,如果您的文件永不改變,只需將數據嵌入到javascript變量中即可。
[EDIT 2]示例
<body>
<!-- The input widget to select a file from browse -->
<input type="file" id="file-input" />
<!-- testing purpose only, a markup to display the loaded file content -->
<h3>Loading a file:</h3>
<pre id="file-content"></pre>
<script>
// Place a listener to know when the page is loaded
window.addEventListener('load',function(e){
// If there is some persistent data on the browser called 'stored_data'
if( localStorage.getItem('stored_data')){
// We can do something with this data
// without asking a user interaction at first
// User interaction could be done in order to refresh the data ( file changed since storing in browser cache )
doSomethingWithFileContents();
}
});
/**
* This is the callback of the addEventListener, it will be executed each time user select a file
* It's linked below, on the addEventListener call
*/
function readSingleFile(e) {
//retrieve the first selected file the user has select
var file = e.target.files[0];
// If no file selected, abort this function execution
if (!file) {
return;
}
// If a file is selected, create a new file reader
var reader = new FileReader();
// Define a callback to be run when the file will be loaded
reader.onload = function(e) {
// You can still use some console.log for debugging purpose
//console.log(e);
// Retrive the content of the loaded file
var contents = e.target.result;
// To enable some persistency, store the contents into a localeStorage
// It means next time you load the page, the data could come from the browser cache
localStorage.setItem('stored_data', contents );
// Will can now call the logic what we need to do with the file content
doSomethingWithFileContents();
};
// Trigger the file reader to load the selected file
reader.readAsText(file);
}
/**
* This function will be executed when data is ready.
* You should implements the logic that should be run with the file data
*
* - Data is ready could mean:
* - Data was available through localStorage
* - Data has just been loaded through FileReader
*/
function doSomethingWithFileContents() {
// Retrieve the cached data
var loadedData = localStorage.getItem('stored_data');
// Get the element that will display the raw data
var element = document.getElementById('file-content');
// Set its content to the storedData
element.textContent = loadedData;
// Once again, I strongly recommend you to use JSON formatted value in the file
// It will enable some easy transformation/parsing from js side
}
// Place a addEventListener on the file-input id element
// When its value changed, run the readSingleFile function
document.getElementById('file-input').addEventListener('change', readSingleFile, false);
</script>
</body>
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