在一个使用AJAX调用的web应用程序中，我需要提交一个请求，但在URL的末尾添加一个参数，例如:
原始URL:
http://server/myapp.php?id=10
导致的网址:
http://server/myapp.php?id=10&enabled=true
寻找一个JavaScript函数，该函数解析URL并查看每个参数，然后添加新参数或更新已经存在的值。
当前回答
以下几点:
合并重复的查询字符串参数 使用绝对和相对url 在浏览器和节点中工作
/**
* Adds query params to existing URLs (inc merging duplicates)
* @param {string} url - src URL to modify
* @param {object} params - key/value object of params to add
* @returns {string} modified URL
*/
function addQueryParamsToUrl(url, params) {
// if URL is relative, we'll need to add a fake base
var fakeBase = !url.startsWith('http') ? 'http://fake-base.com' : undefined;
var modifiedUrl = new URL(url || '', fakeBase);
// add/update params
Object.keys(params).forEach(function(key) {
if (modifiedUrl.searchParams.has(key)) {
modifiedUrl.searchParams.set(key, params[key]);
}
else {
modifiedUrl.searchParams.append(key, params[key]);
}
});
// return as string (remove fake base if present)
return modifiedUrl.toString().replace(fakeBase, '');
}
例子:
// returns /guides?tag=api
addQueryParamsToUrl('/guides?tag=hardware', { tag:'api' })
// returns https://orcascan.com/guides?tag=api
addQueryParamsToUrl('https://orcascan.com/guides?tag=hardware', { tag: 'api' })
其他回答
以下功能将帮助您添加，更新和删除参数或从URL。
/ / example1and
var myURL = '/search';
myURL = updateUrl(myURL,'location','california');
console.log('added location...' + myURL);
//added location.../search?location=california
myURL = updateUrl(myURL,'location','new york');
console.log('updated location...' + myURL);
//updated location.../search?location=new%20york
myURL = updateUrl(myURL,'location');
console.log('removed location...' + myURL);
//removed location.../search
/ / example2
var myURL = '/search?category=mobile';
myURL = updateUrl(myURL,'location','california');
console.log('added location...' + myURL);
//added location.../search?category=mobile&location=california
myURL = updateUrl(myURL,'location','new york');
console.log('updated location...' + myURL);
//updated location.../search?category=mobile&location=new%20york
myURL = updateUrl(myURL,'location');
console.log('removed location...' + myURL);
//removed location.../search?category=mobile
/ /青年们
var myURL = '/search?location=texas';
myURL = updateUrl(myURL,'location','california');
console.log('added location...' + myURL);
//added location.../search?location=california
myURL = updateUrl(myURL,'location','new york');
console.log('updated location...' + myURL);
//updated location.../search?location=new%20york
myURL = updateUrl(myURL,'location');
console.log('removed location...' + myURL);
//removed location.../search
/ / example4
var myURL = '/search?category=mobile&location=texas';
myURL = updateUrl(myURL,'location','california');
console.log('added location...' + myURL);
//added location.../search?category=mobile&location=california
myURL = updateUrl(myURL,'location','new york');
console.log('updated location...' + myURL);
//updated location.../search?category=mobile&location=new%20york
myURL = updateUrl(myURL,'location');
console.log('removed location...' + myURL);
//removed location.../search?category=mobile
/ / example5
var myURL = 'https://example.com/search?location=texas#fragment';
myURL = updateUrl(myURL,'location','california');
console.log('added location...' + myURL);
//added location.../search?location=california#fragment
myURL = updateUrl(myURL,'location','new york');
console.log('updated location...' + myURL);
//updated location.../search?location=new%20york#fragment
myURL = updateUrl(myURL,'location');
console.log('removed location...' + myURL);
//removed location.../search#fragment
这是函数。
function updateUrl(url,key,value){
if(value!==undefined){
value = encodeURI(value);
}
var hashIndex = url.indexOf("#")|0;
if (hashIndex === -1) hashIndex = url.length|0;
var urls = url.substring(0, hashIndex).split('?');
var baseUrl = urls[0];
var parameters = '';
var outPara = {};
if(urls.length>1){
parameters = urls[1];
}
if(parameters!==''){
parameters = parameters.split('&');
for(k in parameters){
var keyVal = parameters[k];
keyVal = keyVal.split('=');
var ekey = keyVal[0];
var evalue = '';
if(keyVal.length>1){
evalue = keyVal[1];
}
outPara[ekey] = evalue;
}
}
if(value!==undefined){
outPara[key] = value;
}else{
delete outPara[key];
}
parameters = [];
for(var k in outPara){
parameters.push(k + '=' + outPara[k]);
}
var finalUrl = baseUrl;
if(parameters.length>0){
finalUrl += '?' + parameters.join('&');
}
return finalUrl + url.substring(hashIndex);
}
如果你在链接或其他地方弄乱了url，你可能也必须考虑哈希。这里有一个相当容易理解的解决方案。可能不是最快的，因为它使用正则表达式…但在99.999%的情况下，这种差异真的不重要!
function addQueryParam( url, key, val ){
var parts = url.match(/([^?#]+)(\?[^#]*)?(\#.*)?/);
var url = parts[1];
var qs = parts[2] || '';
var hash = parts[3] || '';
if ( !qs ) {
return url + '?' + key + '=' + encodeURIComponent( val ) + hash;
} else {
var qs_parts = qs.substr(1).split("&");
var i;
for (i=0;i<qs_parts.length;i++) {
var qs_pair = qs_parts[i].split("=");
if ( qs_pair[0] == key ){
qs_parts[ i ] = key + '=' + encodeURIComponent( val );
break;
}
}
if ( i == qs_parts.length ){
qs_parts.push( key + '=' + encodeURIComponent( val ) );
}
return url + '?' + qs_parts.join('&') + hash;
}
}
你需要适应的基本实现是这样的:
function insertParam(key, value) {
key = encodeURIComponent(key);
value = encodeURIComponent(value);
// kvp looks like ['key1=value1', 'key2=value2', ...]
var kvp = document.location.search.substr(1).split('&');
let i=0;
for(; i<kvp.length; i++){
if (kvp[i].startsWith(key + '=')) {
let pair = kvp[i].split('=');
pair[1] = value;
kvp[i] = pair.join('=');
break;
}
}
if(i >= kvp.length){
kvp[kvp.length] = [key,value].join('=');
}
// can return this or...
let params = kvp.join('&');
// reload page with new params
document.location.search = params;
}
这大约是正则表达式或基于搜索的解决方案的两倍，但这完全取决于查询字符串的长度和任何匹配的索引
为了完成起见，我以慢速regex方法为基准(大约慢了150%)
function insertParam2(key,value)
{
key = encodeURIComponent(key); value = encodeURIComponent(value);
var s = document.location.search;
var kvp = key+"="+value;
var r = new RegExp("(&|\\?)"+key+"=[^\&]*");
s = s.replace(r,"$1"+kvp);
if(!RegExp.$1) {s += (s.length>0 ? '&' : '?') + kvp;};
//again, do what you will here
document.location.search = s;
}
试试这个。
// uses the URL class
function setParam(key, value) {
let url = new URL(window.document.location);
let params = new URLSearchParams(url.search.slice(1));
if (params.has(key)) {
params.set(key, value);
}else {
params.append(key, value);
}
}
此解决方案使用更新的搜索参数更新窗口的当前URL，而无需实际重新加载页面。这种方法在PWA/SPA上下文中很有用。
function setURLSearchParam(key, value) {
const url = new URL(window.location.href);
url.searchParams.set(key, value);
window.history.pushState({ path: url.href }, '', url.href);
}
