// Compare Listings /* author: scott lenger last updated: February 2008 instructions: 1. add link to this file 2. add "compareVehicles();" to onload script in document head 3. make form id="compare" 4. ensure submit inputs (type="submit") are contained in the form tag todo: allow for more than 3 vehicles improve php error handling on resulting page */ function compareSelected(element) { var inputType = element.type; // get the input type var vehiclesSelected = 0; // reset vehicle counter // find all inputs inside the form var inputs = document.getElementById("compare"); inputs.getElementsByTagName("input"); for (var i=0; i 4) { // if more than 3 vehicles are selected alert("A Maximum of 4 vehicles can be compared at a time"); // uncheck the current checkbox element.checked = false; } else if (inputType == "submit") { // submit the form document.getElementById("compare").submit(); // input name="" cannot be "submit" } } // this adds javascript to the form elements function compareVehicles() { if (!document.getElementById("compare")) {return;} // stop the script if the form id isn't found // find all inputs inside of the form var inputs = document.getElementById("compare"); // must use id of form tag inputs.getElementsByTagName("input"); for (var i=0; i