e7c0b1022a82e9facc4f0dceb8d84b19a63b6894
larrym
  Wed Jan 11 15:50:51 2012 -0800
add validateUrl
diff --git src/hg/js/utils.js src/hg/js/utils.js
index 44b272f..0e946f4 100644
--- src/hg/js/utils.js
+++ src/hg/js/utils.js
@@ -364,30 +364,42 @@
             if(val > rangeMax) {
                 if(popup) {
                     obj.value = prompt(title +" is invalid.\nMust be no greater than "+rangeMax+".",obj.value);
                     continue;
                 } else {
                     alert(title +" of '"+obj.value +"' is invalid.\nMust be no greater than "+rangeMax+".");
                     obj.value = obj.defaultValue;
                     return false;
                 }
             }
         }
         return true;
     }
 }
 
+function validateUrl(url)
+{   // returns true if url is a valid url, otherwise returns false and shows an alert
+
+    // I got this regexp from http://stackoverflow.com/questions/1303872/url-validation-using-javascript
+    var regexp = /^(https?|ftp):\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?(((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?)(:\d*)?)(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)?(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i;
+    if(regexp.test(url)) {
+        return true;
+    } else {
+        alert(url + " is an invalid url")
+        return false;
+    }
+}
 
 function metadataIsVisible(trackName)
 {
     var divit = $("#div_"+trackName+"_meta");
     if (divit == undefined || divit.length == 0)
         return false;
     return ($(divit).css('display') != 'none');
 }
 
 function metadataShowHide(trackName,showLonglabel,showShortLabel)
 {
 // Will show subtrack specific configuration controls
 // Config controls not matching name will be hidden
     var divit = $("#div_"+trackName+"_meta");
     if (divit == undefined || divit.length == 0)