Saturday, 21 May 2011
Parsing the query string in Javascript into a single GLOBAL object
Two useful ideas combined:
1. From the book "Javascript the good bits", comes the idea to put all your (Javascript) global variables as ?? of a single global object called GLOBAL like this
var GLOBAL={}
GLOBAL.v1="value1";
GLOBAL.v2=0xFF;
2. If the html document is called with a URL with a search string (file.htm?v1=value1&v2=0xFF) then using Javascript you can parse the query string in the following way...
// http://stevenbenner.com/2010/03/javascript-regex-trick-parse-a-query-string-into-an-object/
// load GLOBAL with properties from the querystring at the end of the URL
// e.g. "?session=2010_2011&mod_id=COA122" produces GLOBAL.session='2010_2011' & GLOBAL.mod_id='COA122'
var GLOBAL={}
location.search.replace(
new RegExp("([^?=&]+)(=([^&]*))?", "g"),
function($0, $1, $2, $3) {
var e="GLOBAL."+$1+" = '"+$3+"'";
//alert(e);
eval(e);
}
);
Thursday, 12 May 2011
Removing rowspan from a table
I had written a data mining (scraping) script to obtain data from a table and it was working - until the table started having rowspan entries in it. I decided the easiest way to continue was to write a script to replace the rowspan entries with the requisite number of simple entries.
Here is the rowspan replacement script I used (it is written in Javascript and uses jQuery)
The reverse() bit is needed to preserve order - the script uses prepend to insert new elements so we have to start with the last element that needs work and finish with the first.
Here is the rowspan replacement script I used (it is written in Javascript and uses jQuery)
The reverse() bit is needed to preserve order - the script uses prepend to insert new elements so we have to start with the last element that needs work and finish with the first.
function replace_rowspan(section){
$.fn.reverse = [].reverse; //http://forum.jquery.com/topic/jquery-reverse-a-collection-of-jquery-elements
//script to process an array containing rowspan and re-write it without rowspan by putting in all the repeats
while($(section).find("td[rowspan]").length>0){ //are there any rowspans left
$(section).find("tr>td[rowspan]:first").each(function(i,tdi){ //find a row with a rowspan
var the_row=$(tdi).parents("tr");
$(the_row).find("td[rowspan]").reverse().each(function(j,tdj){
var c=$(tdj).clone();
var rs=$(tdj).attr("rowspan")-1;
var v=$(tdj).text();
$(tdj).removeAttr("rowspan");
if(rs>=2) //if the rowspan left is 2 or more, then leave the rowspan attribute in and let it be processed next time round
$(the_row).next().prepend($(c).attr("rowspan",rs).addClass("green") );
else if(rs==1) // otherwise this will be the last new entry and the rowspan attribute can be removed
$(the_row).next().prepend($(c).removeAttr("rowspan").addClass("red") );
})
})
}
}
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