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最新评论
-
dadadada2x:
user模型里加上 protected def email ...
流行的权限管理 gem devise的定制 -
Sev7en_jun:
shrekting 写道var pattern = /^(0| ...
强悍的ip格式 正则表达式验证 -
jiasanshou:
好文章!!!
RPM包rpmbuild SPEC文件深度说明 -
寻得乐中乐:
link_to其实就是个a标签,使用css控制,添加一个参数: ...
Rails在link_to中加参数 -
aiafei0001:
完全看不懂,不知所然.能表达清楚一点?
"$ is not defined" 的问题怎么办
这是一个特别的,不太正统的需求,
因为,大部分时候,ajax的返回,只要返回json类型数据就可以了
然而,如果返回的是partial,partial里有变量是hash,而这个hash又需要jquery的plugin例如图表之类的用,那就需要这个rails的hash转成javascript能认,能读的hash了。
思路呢,还是通过json
就是在haml或者erb页面里吧hash转json
然后
或者
eval
另外,这样的转换,需要比较标准的json格式,要一般的转换参考用下面的
https://github.com/douglascrockford/JSON-js
因为,大部分时候,ajax的返回,只要返回json类型数据就可以了
然而,如果返回的是partial,partial里有变量是hash,而这个hash又需要jquery的plugin例如图表之类的用,那就需要这个rails的hash转成javascript能认,能读的hash了。
思路呢,还是通过json
就是在haml或者erb页面里吧hash转json
然后
jQuery.parseJSON( json )
var obj = jQuery.parseJSON('{"name":"John"}'); alert( obj.name === "John" );
或者
eval
另外,这样的转换,需要比较标准的json格式,要一般的转换参考用下面的
https://github.com/douglascrockford/JSON-js
引用
JavaScript is a general purpose programming language that was introduced as the page scripting language for Netscape Navigator. It is still widely believed to be a subset of Java, but it is not. It is a Scheme-like language with C-like syntax and soft objects. JavaScript was standardized in the ECMAScript Language Specification, Third Edition.
JSON is a subset of the object literal notation of JavaScript. Since JSON is a subset of JavaScript, it can be used in the language with no muss or fuss.
var myJSONObject = {"bindings": [
{"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
{"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
]
};
In this example, an object is created containing a single member "bindings", which contains an array containing three objects, each containing "ircEvent", "method", and "regex" members.
Members can be retrieved using dot or subscript operators.
myJSONObject.bindings[0].method // "newURI"
To convert a JSON text into an object, you can use the eval() function. eval() invokes the JavaScript compiler. Since JSON is a proper subset of JavaScript, the compiler will correctly parse the text and produce an object structure. The text must be wrapped in parens to avoid tripping on an ambiguity in JavaScript's syntax.
var myObject = eval('(' + myJSONtext + ')');
The eval function is very fast. However, it can compile and execute any JavaScript program, so there can be security issues. The use of eval is indicated when the source is trusted and competent. It is much safer to use a JSON parser. In web applications over XMLHttpRequest, communication is permitted only to the same origin that provide that page, so it is trusted. But it might not be competent. If the server is not rigorous in its JSON encoding, or if it does not scrupulously validate all of its inputs, then it could deliver invalid JSON text that could be carrying dangerous script. The eval function would execute the script, unleashing its malice.
To defend against this, a JSON parser should be used. A JSON parser will recognize only JSON text, rejecting all scripts. In browsers that provide native JSON support, JSON parsers are also much faster than eval. It is expected that native JSON support will be included in the next ECMAScript standard.
var myObject = JSON.parse(myJSONtext, reviver);
The optional reviver parameter is a function that will be called for every key and value at every level of the final result. Each value will be replaced by the result of the reviver function. This can be used to reform generic objects into instances of pseudoclasses, or to transform date strings into Date objects.
myData = JSON.parse(text, function (key, value) {
var type;
if (value && typeof value === 'object') {
type = value.type;
if (typeof type === 'string' && typeof window[type] === 'function') {
return new (window[type])(value);
}
}
return value;
});
A JSON stringifier goes in the opposite direction, converting JavaScript data structures into JSON text. JSON does not support cyclic data structures, so be careful to not give cyclical structures to the JSON stringifier.
var myJSONText = JSON.stringify(myObject, replacer);
If the stringify method sees an object that contains a toJSON method, it calls that method, and stringifies the value returned. This allows an object to determine its own JSON representation.
The stringifier method can take an optional array of strings. These strings are used to select the properties that will be included in the JSON text.
The stringifier method can take an optional replacer function. It will be called after the toJSON method (if there is one) on each of the values in the structure. It will be passed each key and value as parameters, and this will be bound to object holding the key. The value returned will be stringified.
Values that do not have a representation in JSON (such as functions and undefined) are excluded.
Nonfinite numbers are replaced with null. To substitute other values, you could use a replacer function like this:
function replacer(key, value) {
if (typeof value === 'number' && !isFinite(value)) {
return String(value);
}
return value;
}
JSON is a subset of the object literal notation of JavaScript. Since JSON is a subset of JavaScript, it can be used in the language with no muss or fuss.
var myJSONObject = {"bindings": [
{"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
{"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
]
};
In this example, an object is created containing a single member "bindings", which contains an array containing three objects, each containing "ircEvent", "method", and "regex" members.
Members can be retrieved using dot or subscript operators.
myJSONObject.bindings[0].method // "newURI"
To convert a JSON text into an object, you can use the eval() function. eval() invokes the JavaScript compiler. Since JSON is a proper subset of JavaScript, the compiler will correctly parse the text and produce an object structure. The text must be wrapped in parens to avoid tripping on an ambiguity in JavaScript's syntax.
var myObject = eval('(' + myJSONtext + ')');
The eval function is very fast. However, it can compile and execute any JavaScript program, so there can be security issues. The use of eval is indicated when the source is trusted and competent. It is much safer to use a JSON parser. In web applications over XMLHttpRequest, communication is permitted only to the same origin that provide that page, so it is trusted. But it might not be competent. If the server is not rigorous in its JSON encoding, or if it does not scrupulously validate all of its inputs, then it could deliver invalid JSON text that could be carrying dangerous script. The eval function would execute the script, unleashing its malice.
To defend against this, a JSON parser should be used. A JSON parser will recognize only JSON text, rejecting all scripts. In browsers that provide native JSON support, JSON parsers are also much faster than eval. It is expected that native JSON support will be included in the next ECMAScript standard.
var myObject = JSON.parse(myJSONtext, reviver);
The optional reviver parameter is a function that will be called for every key and value at every level of the final result. Each value will be replaced by the result of the reviver function. This can be used to reform generic objects into instances of pseudoclasses, or to transform date strings into Date objects.
myData = JSON.parse(text, function (key, value) {
var type;
if (value && typeof value === 'object') {
type = value.type;
if (typeof type === 'string' && typeof window[type] === 'function') {
return new (window[type])(value);
}
}
return value;
});
A JSON stringifier goes in the opposite direction, converting JavaScript data structures into JSON text. JSON does not support cyclic data structures, so be careful to not give cyclical structures to the JSON stringifier.
var myJSONText = JSON.stringify(myObject, replacer);
If the stringify method sees an object that contains a toJSON method, it calls that method, and stringifies the value returned. This allows an object to determine its own JSON representation.
The stringifier method can take an optional array of strings. These strings are used to select the properties that will be included in the JSON text.
The stringifier method can take an optional replacer function. It will be called after the toJSON method (if there is one) on each of the values in the structure. It will be passed each key and value as parameters, and this will be bound to object holding the key. The value returned will be stringified.
Values that do not have a representation in JSON (such as functions and undefined) are excluded.
Nonfinite numbers are replaced with null. To substitute other values, you could use a replacer function like this:
function replacer(key, value) {
if (typeof value === 'number' && !isFinite(value)) {
return String(value);
}
return value;
}
var myJSONObject = {"bindings": [ {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"}, {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"}, {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"} ] };
发表评论
-
Destroying a Postgres DB on Heroku
2013-04-24 10:58 926heroku pg:reset DATABASE -
VIM ctags setup ack
2012-04-17 22:13 3254reference ctags --extra=+f --e ... -
alias_method_chain方法在3.1以后的替代使用方式
2012-02-04 02:14 3285alias_method_chain() 是rails里的一个 ... -
一些快速解决的问题
2012-01-19 12:35 1469问题如下: 引用Could not open library ... -
API service 安全问题
2011-12-04 08:47 1378这是一个长期关注的课题 rest api Service的 ... -
Module方法调用好不好
2011-11-20 01:58 1342以前说,用module给class加singleton方法,和 ... -
一个ajax和rails交互的例子
2011-11-19 01:53 1902首先,这里用了一个,query信息解析的包,如下 https: ... -
关于Rubymine
2011-11-18 23:21 2258开个帖子收集有关使用上的问题 前一段时间,看到半价就买了。想 ... -
ruby中和javascript中,动态方法的创建
2011-11-18 21:01 1232class Klass def hello(*args) ... -
textmate快捷键 汇总
2011-11-16 07:20 8136TextMate 列编辑模式 按住 Alt 键,用鼠标选择要 ... -
Ruby面试系列六,面试继续面试
2011-11-15 05:55 2018刚才受到打击了,充分报漏了自己基础不扎实,不肯向虎炮等兄弟学习 ... -
说说sharding
2011-11-13 00:53 1478这个东西一面试就有人 ... -
rails面试碎碎念
2011-11-12 23:51 1939面试继续面试 又有问ru ... -
最通常的git push reject 和non-fast forward是因为
2011-11-12 23:29 17206git push To git@github.com:use ... -
Rails 自身的many to many关系 self has_many
2011-11-12 01:43 2727简单点的 #注意外键在person上people: id ... -
Rails 3下的 in place editor edit in place
2011-11-12 01:20 943第一个版本 http://code.google.com/p ... -
Heroku 的诡异问题集合
2011-11-11 07:22 1690开个Post记录,在用heroku过程中的一些诡异问题和要注意 ... -
SCSS 和 SASS 和 HAML 和CoffeeScript
2011-11-07 07:52 12951Asset Pipeline 提供了内建 ... -
Invalid gemspec because of the date format in specification
2011-11-07 02:14 2112又是这个date format的错误。 上次出错忘了,记录下 ... -
ruby面试系列五,面试题及其他
2011-11-05 21:18 7400周六早晨,因为早了所 ...
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