Two methods to redirect URL parameters in JavaScript

Summary of Two Methods for redirecting URL parameters in JavaScript this article mainly introduces two methods for redirecting URL parameters in JavaScript. Let's not talk about them here. Let's look at the sample code directly.

I. Character concatenation

Function setUri (para, val) {var strNewUrl = new String (); var strUrl = new String (); var url = window. location. href; strUrl = window. location. href; if (strUrl. indexOf ("? ")! =-1) {strUrl = strUrl. substr (strUrl. indexOf ("? ") + 1); // obtain the parameter if (strUrl. toLowerCase (). indexOf (para. toLowerCase () =-1) {// if no parameter is found, assign strNewUrl = url + "&" + para + "=" + val; window. location. href = strNewUrl;} else {var aParam = strUrl. split ("&"); for (var I = 0; I <aParam. length; I ++) {if (aParam [I]. substr (0, aParam [I]. indexOf ("= ")). toLowerCase () = para. toLowerCase () {aParam [I] = aParam [I]. substr (0, aParam [I]. indexOf ("=") + "= "+ Val ;}} strNewUrl = url. substr (0, url. indexOf ("? ") + 1) + aParam. join (" & "); window. location. href = strNewUrl;} else {strUrl + = "? "+ Para +" = "+ val; window. location. href = strUrl ;}}

Ii. Use Regular Expressions

// Use the regular function setPara (para, val) {var newpar = ""; var url = window. location. href; var pars = location. search. substring (1); var reg = new RegExp ("(^ |)" + para + "= ([^ &] *) (| $)"); if (reg. test (pars) {// The required parameter para var p1 = pars. split (para) [0]; // productID = 100857 & count = 1 & var p2 = pars. split (para) [1]; // = 75825 & coupval = 1.5 & addressID = 358 & invoiceID = 1245 & invoiceName = jesse if (p2.indexOf ("&")>-1) {v Ar p3 = p2.split ("&") [0]; if (p3 = "=" + val + "") {return false ;} newpar = p1 + para + '=' + val + '&' + (p2.split (p3) [1];} else {if (p1) {newpar = p1 + para + '=' + val;} else {newpar = para + '=' + val ;}} else {if (url. indexOf ("? ") =-1) {newpar = pars +" & "+ para +" = "+ val ;} else {newpar = pars + "&" + para + "=" + val ;}} window. location. href = location. href. split ('? ') [0] + "? "+ Newpar ;}

Call:

Script window. onload = function () {var btn = document. getElementById ("btnClick"); btn. onclick = function () {// url: http: // localhost: 54714/testuri. aspx? ProductID = 100857 & count = 1 & coupresId = 12785 & coupval = 1.5 & openId = 12456 & addressID = 358 & invoiceID = & invoiceName = // setUri ("coupresId", 0 ); setPara ("coupresId", 0) ;}} script

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