How can I read a GET element from url via javascript?

This question already has an answer here:

How can I get query string values in JavaScript? 73 answers

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You can try the following:

if((window.location.href).indexOf('?') != -1) {
    var queryString = (window.location.href).substr((window.location.href).indexOf('?') + 1); 

    // "queryString" will now contain kerdesPost=fdasdas%20ad%20asd%20ad%20asdas

    var value = (queryString.split('='))[1];

    // "value" will now contain fdasdas%20ad%20asd%20ad%20asdas

    value = decodeURIComponent(value);

    // "value" will now contain fdasdas ad asd ad asdas (unescaped value)
}

JSFiddle

This should get you what you need.

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