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Gopal Rao
Mumbai, Maharashtra, India
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How to get url query string in jquery sharepoint 2013
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Introduction 
For example, when creating the sharepoint hosted app the custom properties send through querystring.In that process you need to get query string values by jquery.The example codes follows
Jquery
function getUrlVariable() {/* Function to get query string values */
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for (var i = 0; i < hashes.length; i++) {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = decodeURIComponent(hash[1]);
    }
    return vars;
}

$(document).ready(function () {
var queryVariable = getUrlVariable();/* Assign function to variable */
eListName = decodeURIComponent(queryVariable["listName"]);/* Getting the values */
eEventTitle = decodeURIComponent(queryVariable["eventTitle"]);
});
Another way
// Function to get the URL parameters
function getURLParameter(name) {
    return decodeURI(
          (RegExp(name + '=' + '(.+?)(&|$)').exec(location.search) || [,
null])[1]
    );
}
$(document).ready(function () {
hostweburl = decodeURIComponent(getURLParameter("SPHostUrl"));
appweburl = decodeURIComponent(getURLParameter("SPAppWebUrl"));
});
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