The Built-In Functions Are Not Meant for Query Strings These have been depreciated and replaced with two pairs,ĮncodeURIComponent() and decodeURIComponent().ģ.1. Originally there was just escape() and unescape(). We need to closely examine the handy tools built into by JavascriptĮncoding functions and three decoding functions for URLs. So that's what I'm going to do in this article.īefore we get down to the task of writing a query string parser, Query string parser to the public, it ought to obey those rules, since The "application/x-www-form-urlencoded" rules, and if we are offering a However it is certainly standard practice to encode query strings using Recommend that you use semicolons to separate the key/value pairs In fact, the W3C recommends that you make at least one change in such I'm not required to follow the W3C recommendations. Then the parsers I saw on the net would be fine. Special characters or spaces, never have null values, If in my application my query strings never contain In that case I can encode the parameters any darned way I please. In my case, the parameters are just generated by another one of my pages. Generated by a form submission with method="GET", then this is So in the specific case that the query string you are parsing was The name is separated from the value by `=' and name/value pairs are separated from each other by `&'. The control names/values are listed in the order they appear in the document.Line breaks are represented as "CR LF" pairs (i.e., `%0D%0A'). Space characters are replaced by `+', and then reserved characters are escaped as described in, section 2.2: Non-alphanumeric characters are replaced by `%HH', a percent sign and two hexadecimal digits representing the ASCII code of the character. On the URL, instead of in the request body as is done with the more normallyįorms submitted with this content type must be encoded as follows:Ĭontrol names and values are escaped. Where whatever was filled into the form is passed in the query string With content type "application/x-www-form-urlencoded" With method="GET", and submit it, then it will be posted There is really only one case where there is a standard for how the query Maybe it contains key/value pairs, and maybe it doesn't.Ībout the only hard rule is that it shouldn't ever contain a pound sign. Go, the query string is just a string whose syntax is defined by theĪpplication. You see, really there is no standard defining the correct way toĮncode key/value pairs into a query string. Query String Standards (or the Lack Thereof)Īll this looked rather unsatisfactory to me, but, in a way, It should be possible to getĪll the values in such cases, not just the first or last.Ģ. This is the normal resultįrom form elements like multiple selects. Failure to Correctly Handle Multiple Values.Ī query string can contain multiple values for the same key, like.Would not distinguish these cases from key1 and key2 being Query strings can contain parameters with a null value, written as Failure to Correctly Handle Null Values.Though admittedly it is a case that doesn't come up often. I didn't see a single solution that handled this correctly, Something like " rock%26roll=here+to+stay" is perfectly legal,Īnd should give the result that " rock&roll" is It is possible for the key strings to be encoded as well. I saw one that tried to handle this by called decodeURI() onīut that would decode neither the plus signs nor the " %26" in They would return " Rock+%26+Roll" as the value of the string. Most of the solutions I saw did no decoding of this at all. What if my search string is " Rock & Roll"? Which appears to do everything correctly.) I noticed four distinct problems with their parsing of query strings.Īmong the dozens of solutions I saw, only a few handled even one of these Proffered on the net, but my first impression, as I read through them, I did indeed find plenty of solutions to this problem generously I should be able to google up something someone else wrote. So I shouldn't have to write it from scratch. I figured this was a normal enough kind of thing to want to do, " Fruit Bat" and the number of results to display Those command line arguments, so that it will know that the search string is That is I have a page that is loaded by a URL something like:Īnd I want the Javascript that is embedded in the HTML page to be retrieve Parameters that were passed to it in the URL. Recently I had a Javascript application that needed to parse the query Javascript Madness: Query String Parsing Jan Wolter Javascript Madness: Query String Parsing Javascript Madness Intro
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