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我正在尝试将JavaScript函数注入到运行服务器URL“www.myserver.com”的webview中。但是,我无法这样做。我尝试了几种方法,但没有成功。我尝试设置js警报,在读取js文件时不会弹出。我不确定我做错了什么。这里是我到目前为止的代码: 我的js文件 “page.js”:我如何注入一个复杂的JavaScript自运行功能到android的webview?
(function() {
**alert("this is a test alert");**
if (window.page) {
return; // page has been loaded from somewhere, not to redefine it again
}
function Response(xhr) {
this.xhr = xhr;
this.status = xhr.status;
}
Response.prototype.getHeader = function(header) {
return this.xhr.getResponseHeader(header);
};
Response.prototype.getBody = function() {
return this.xhr.responseText;
};
function ajax(url, callback) {
//TODO support PUT method
var xhr = new XMLHttpRequest();
xhr.open("GET", url, true);
xhr.onerror = function(e) {
callback.onerror(e);
};
xhr.onreadystatechange = function(event) {
if (this.readyState != this.DONE || this.status == 0) {
return;
}
if (this.status != 200) {
var response = new Response(xhr);
callback.onfail(response);
return;
}
callback.onsuccess(this.responseText);
};
xhr.send();
};
var rpc = {
type: ["SMALL", "LARGE"],
exec: function(call, type) {// "call" conform to JSON-RPC 2.0
//TODO differentiate POST/GET based on rpc.type.SMALL/LARGE
var param = encodeURIComponent(JSON.stringify(call));
ajax("?_$b=" + param, {
onerror: function(e) {
//TODO use logging
alert("Error:"+e.toString());
},
onfail: function(response) {
//TODO use logging
alert("Failed:"+response.getBoby());
},
onsuccess: function(text) {
//TODO use logging
alert("page success:"+text);
},
});
}
};
var _$b = window.page = {
version: "0.1"
};
_$b.has = function(feature) {
// TODO support nested objects, e.g.: "cache.get"
return _$b[feature];
};
_$b.notify = function(id, data) {
// TODO invoke the function from native and send web event
// var event = document.createEvent('Event');
// event.initEvent(id, true, true);
// document.dispatchEvent(event);
alert("id:" + id + ";data:" + data);
};
_$b.navigate = function(url, title) {
rpc.exec(// JSON-RPC 2.0
{method: "navigate", params: {
"url": url,
"title": title
}}, rpc.type.SMALL);
};
_$b.cache = {};
_$b.cache.get = function(id) {
rpc.exec(
{method: "cache.get", params: {
"id": id,
}}, rpc.type.SMALL);
};
_$b.cache.put = function(id, obj, ts, ttl) {
rpc.exec(
{method: "cache.put", params: {
"id": id,
"obj": obj,
"ts": ts,
"ttl": ttl,
}}, rpc.type.LARGE);
};
_$b.cache.has = function(id) {
rpc.exec(
{method: "cache.has", params: {
"id": id,
}}, rpc.type.SMALL);
};
})();
这里是我的WebView代码:
@Override
public void onPageFinished(WebView view, String url) {
String javascript = "";
try{
AssetManager manager = view.getContext().getAssets();
InputStream is = manager.open("page.js");
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null) {
javascript += line;
}
is.close();
}
catch(Exception e){}
view.loadUrl("javascript:" + javascript);
}
webview.setWebChromeClient(new WebChromeClient() {});
webview.loadUrl(url);
任何想法如何得到警报弹出? 注意:当我删除js中的所有功能并只保留警报时,警报就可以工作,但是在我重新添加必要的js功能后,警报不再起作用。任何想法可能会阻止它按预期注入js?
我怎么修复和打电话给我的JS功能让它工作?在哪里以及如何在我的本地代码中触发它,以便在您的html中替换onclick =“run”? –
我已经更新了一个新的样本。你需要命名该函数,并执行它来运行它 – sihao
谢谢。当我复制粘贴整个文件内容作为一个字符串,而不是在我的输入流阅读器中读取内容作为“file.js”时它工作。我想它也解释了我的js文件中的选项卡和新行。你知道一种方式,我可以确保这些标签和新行不出现吗?无论哪种方式,谢谢你的回应。你也可以帮我解决这个问题,我正在面对json解析从相同的JavaScript字符串:http://stackoverflow.com/questions/36498500/how-to-json-parse-a-url-parameter-in-android -webview –