用javascript我怎么能添加一个查询字符串参数的url,如果不存在或如果它存在,更新当前值?我使用jquery为我的客户端开发。
当前回答
感谢现代javascript, node.js和浏览器的支持,我们可以摆脱第三方库的漩涡(jquery, query-string等)和DRY自己。
下面是javascript(node.js)和typescript版本的函数,用于添加或更新给定url的查询参数:
Javascript
const getUriWithParam = (baseUrl, params) => { const Url = new URL(baseUrl); const urlParams = new URLSearchParams(Url.search); for (const key in params) { if (params[key] !== undefined) { urlParams.set(key, params[key]); } } Url.search = urlParams.toString(); return Url.toString(); }; console.info('expected: https://example.com/?foo=bar'); console.log(getUriWithParam("https://example.com", {foo: "bar"})); console.info('expected: https://example.com/slug?foo=bar#hash'); console.log(getUriWithParam("https://example.com/slug#hash", {foo: "bar"})); console.info('expected: https://example.com/?bar=baz&foo=bar'); console.log(getUriWithParam("https://example.com?bar=baz", {foo: "bar"})); console.info('expected: https://example.com/?foo=baz&bar=baz'); console.log(getUriWithParam("https://example.com?foo=bar&bar=baz", {foo: "baz"}));
打印稿
const getUriWithParam = (
baseUrl: string,
params: Record<string, any>
): string => {
const Url = new URL(baseUrl);
const urlParams: URLSearchParams = new URLSearchParams(Url.search);
for (const key in params) {
if (params[key] !== undefined) {
urlParams.set(key, params[key]);
}
}
Url.search = urlParams.toString();
return Url.toString();
};
对于React Native
URL在React Native中没有实现。所以你必须事先安装react-native-url-polyfill。
对于对象参数
请看这个答案中的第二个解决方案
其他回答
我想要的是:
使用浏览器的本地URL API 可以添加、更新、获取或删除吗 期望在散列之后的查询字符串,例如对于单页应用程序
function queryParam(options = {}) { var defaults = { method: 'set', url: window.location.href, key: undefined, value: undefined, } for (var prop in defaults) { options[prop] = typeof options[prop] !== 'undefined' ? options[prop] : defaults[prop] } const existing = (options.url.lastIndexOf('?') > options.url.lastIndexOf('#')) ? options.url.substr(options.url.lastIndexOf('?') + 1) : '' const query = new URLSearchParams(existing) if (options.method === 'set') { query.set(options.key, options.value) return `${options.url.replace(`?${existing}`, '')}?${query.toString()}` } else if (options.method === 'get') { const val = query.get(options.key) let result = val === null ? val : val.toString() return result } else if (options.method === 'delete') { query.delete(options.key) let result = `${options.url.replace(`?${existing}`, '')}?${query.toString()}` const lastChar = result.charAt(result.length - 1) if (lastChar === '?') { result = `${options.url.replace(`?${existing}`, '')}` } return result } } // Usage: let url = 'https://example.com/sandbox/#page/' url = queryParam({ url, method: 'set', key: 'my-first-param', value: 'me' }) console.log(url) url = queryParam({ url, method: 'set', key: 'my-second-param', value: 'you' }) console.log(url) url = queryParam({ url, method: 'set', key: 'my-second-param', value: 'whomever' }) console.log(url) url = queryParam({ url, method: 'delete', key: 'my-first-param' }) console.log(url) const mySecondParam = queryParam({ url, method: 'get', key: 'my-second-param', }) console.log(mySecondParam) url = queryParam({ url, method: 'delete', key: 'my-second-param' }) console.log(url)
下面是使用锚HTML元素的内置属性的另一种方法:
处理多值参数。 没有修改#片段或查询字符串本身以外的任何内容的风险。 可能会更容易读?但是它更长。
var a = document.createElement('a'), getHrefWithUpdatedQueryString = function(param, value) { return updatedQueryString(window.location.href, param, value); }, updatedQueryString = function(url, param, value) { /* A function which modifies the query string by setting one parameter to a single value. Any other instances of parameter will be removed/replaced. */ var fragment = encodeURIComponent(param) + '=' + encodeURIComponent(value); a.href = url; if (a.search.length === 0) { a.search = '?' + fragment; } else { var didReplace = false, // Remove leading '?' parts = a.search.substring(1) // Break into pieces .split('&'), reassemble = [], len = parts.length; for (var i = 0; i < len; i++) { var pieces = parts[i].split('='); if (pieces[0] === param) { if (!didReplace) { reassemble.push('&' + fragment); didReplace = true; } } else { reassemble.push(parts[i]); } } if (!didReplace) { reassemble.push('&' + fragment); } a.search = reassemble.join('&'); } return a.href; };
如果它没有设置或想要更新一个新值,您可以使用:
window.location.search = 'param=value'; // or param=new_value
这是用简单Javascript写的。
EDIT
你可能想尝试使用jquery查询对象插件
窗口.位置.搜索 = jQuery.query.set(“param”, 5);
使用此函数可以添加、删除和修改URL中的查询字符串参数
/**
@param String url
@param object param {key: value} query parameter
*/
function modifyURLQuery(url, param){
var value = {};
var query = String(url).split('?');
if (query[1]) {
var part = query[1].split('&');
for (i = 0; i < part.length; i++) {
var data = part[i].split('=');
if (data[0] && data[1]) {
value[data[0]] = data[1];
}
}
}
value = $.extend(value, param);
// Remove empty value
for (i in value){
if(!value[i]){
delete value[i];
}
}
// Return url with modified parameter
if(value){
return query[0] + '?' + $.param(value);
} else {
return query[0];
}
}
添加新的和修改现有参数的url
var new_url = modifyURLQuery("http://google.com?foo=34", {foo: 50, bar: 45});
// Result: http://google.com?foo=50&bar=45
删除现有的
var new_url = modifyURLQuery("http://google.com?foo=50&bar=45", {bar: null});
// Result: http://google.com?foo=50
基于@amateur的回答(现在结合了来自@j_walker_dev评论的修复),但考虑到url中关于散列标签的评论,我使用以下方法:
function updateQueryStringParameter(uri, key, value) {
var re = new RegExp("([?&])" + key + "=.*?(&|#|$)", "i");
if (uri.match(re)) {
return uri.replace(re, '$1' + key + "=" + value + '$2');
} else {
var hash = '';
if( uri.indexOf('#') !== -1 ){
hash = uri.replace(/.*#/, '#');
uri = uri.replace(/#.*/, '');
}
var separator = uri.indexOf('?') !== -1 ? "&" : "?";
return uri + separator + key + "=" + value + hash;
}
}
编辑修复[?|&]在正则表达式中当然应该是[?正如评论中指出的那样
编辑:支持删除URL参数的替代版本。我已经使用value === undefined作为表示删除的方式。可以使用value === false,甚至可以根据需要使用单独的输入参数。
function updateQueryStringParameter(uri, key, value) {
var re = new RegExp("([?&])" + key + "=.*?(&|#|$)", "i");
if( value === undefined ) {
if (uri.match(re)) {
return uri.replace(re, '$1$2').replace(/[?&]$/, '').replaceAll(/([?&])&+/g, '$1').replace(/[?&]#/, '#');
} else {
return uri;
}
} else {
if (uri.match(re)) {
return uri.replace(re, '$1' + key + "=" + value + '$2');
} else {
var hash = '';
if( uri.indexOf('#') !== -1 ){
hash = uri.replace(/.*#/, '#');
uri = uri.replace(/#.*/, '');
}
var separator = uri.indexOf('?') !== -1 ? "&" : "?";
return uri + separator + key + "=" + value + hash;
}
}
}
详见https://jsfiddle.net/cdt16wex/