#797 Introduced Doc for geneTable filtering.

client-base/src/main/webapp/html/featureDocs/gene-table-filter.md

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+
+# Genetable filter doc
+
+This documentation aims to show you how Knetminer genes table filters work. It showcases the code structure in `gene-table-filter.js`. 
+
+## Genes-table-filtering.js 
+This file contains the JavaScript scripts that handle the knetscore and graph distance filters present in the knetminer's gene view. It houses three Objects: `knetscoreFilter`, `graphDistanceFilter` and `geneTableFilterMgr`, and it can be found [here][10]
+
+KnetScoreFilter object handles the functionalities associated with gene view knetscore filter.
+```
+// Detects min and max knetscore values from genetable data.
+detectRange (tableData)
+{
+    ...
+}
+
+// Sets min & max range values after both values are detected in detectRange() above.
+setRangeValue(value, rangeType)
+{
+    ...
+}
+
+// Handles on change event triggered when left thumb of gene view slider is triggered
+// Takes min input HTML object as paramter
+handleLeftThumb(minElement)
+{
+    ...
+}
+
+// Handles on change event triggered when right thumb of gene view slider is triggered
+handleRightThumb(maxElement)
+{
+    ...
+}
+
+//Method takes an input value and direction parameter to signify style slider based on distance covered.
+setScorePosition (inputValue, direction)
+{
+    ...
+}
+
+// Renders knetscore slider to knetminer UI.
+renderUi()
+{
+    ...
+};
+```
+
+graphDistanceFilter object houses methods handling functionalities associated with gene view graph distance filter.
+```
+    // MaxNumber property used for comparison reasons to check for maximum distance within genetable data.
+    maxNumber : -Infinity
+
+    // Sets the maximum graph distance value from genetable data.
+    detectRange(tableData)
+    {
+        ...
+    }
+    // Creates HTML select element based maximum graph distance.
+    createSelectElement(){
+        ...
+    }
+    // Renders graph distance drop-down element to knetminer UI.
+    renderUi()
+    {
+        ...
+    }
+
+```
+
+geneTableFilterMgr object handles management of graph-distance and knetscore filters 
+```
+// TableData property used to store the genetable data
+tableData:[]
+
+// Saves table data
+setup(data)
+{
+    ...
+}
+// Method renders graph-distance and knetscore filters to UI and called in setup() above.
+renderFiltersToUi()
+{
+    ...
+}
+
+// Method called to handle events triggered by graph distance and Knettscore value changes
+filterByDistanceAndScore(event)
+{
+    ...
+}
+
+// Method renders filtered table, called above
+renderFilteredTable(table)
+{
+    ...
+}
+// Toggle visibility of gene view table body based on length filtered table 
+// When the filtered table length is less than one, the table body is not visible.
+// Called in filterByDistanceAndScore().
+toggleTableState(dataLength)
+```
+
+[10]: https://github.com/Rothamsted/knetminer/blob/master/client-base/src/main/webapp/html/javascript/genes-table-filtering.js#L133
+