Merge pull request #61 from frank-weindel/hide-the-tip

If tipFormatter is null, don't show the tip

README.md

@@ -144,9 +144,9 @@ ReactDOM.render(<Rcslider />, container);
         </tr>
         <tr>
           <td>tipFormatter</td>
-          <td>function</td>
+          <td>function or `null`</td>
           <td></td>
-          <td>Format the value of the tooltip if it shows.</td>
+          <td>Format the value of the tooltip if it shows. If `null` the tooltip will always be hidden.</td>
         </tr>
         <tr>
           <td>dots</td>

examples/slider.js

@@ -86,6 +86,10 @@ ReactDOM.render(
       <p>Basic Slider with `tipFormatter`</p>
       <Slider tipFormatter={percentFormatter} tipTransitionName="rc-slider-tooltip-zoom-down" onChange={log} />
     </div>
+    <div style={style}>
+      <p>Basic Slider without tooltip</p>
+      <Slider tipFormatter={null} onChange={log} />
+    </div>
     <div style={style}>
       <p>Controlled Slider</p>
       <Slider value={50} />

src/Slider.jsx

@@ -339,7 +339,7 @@ class Slider extends React.Component {
     const lowerOffset = this.calcOffset(lowerBound);
 
     const handleClassName = prefixCls + '-handle';
-    const isNoTip = (step === null) && !tipFormatter;
+    const isNoTip = (step === null) || (tipFormatter === null);
 
     const upper = (<Handle className={handleClassName}
                            noTip={isNoTip} tipTransitionName={tipTransitionName} tipFormatter={tipFormatter}