Form slider with Form Validator in React Range Slider component

02 Feb 2023 / 5 minutes to read

The Slider component can be validated using our FormValidator. The following steps walk-through slider validation.

Render slider component inside a form.
Bind changed event in the slider component to validate the slider value when the value changes.
Initialize and render FormValidator for the form using form ID.

// Initialize Form validation
let formObj: FormValidator;
formObj = new FormValidator("#formId", options);

Set the required property in the FormValidator rules collection. Here, the min property of slider that sets the minimum value in the slider component is set, and it has hidden input as enable validateHidden property is set to true.

// Slider element
<div id="default" name="slider"></div>

// sets required property in the FormValidator rules collection
let options: FormValidatorModel = {
  rules: {
'default': {
  validateHidden: true,
  min: [6, "You must select value greater than 5"]
}
  }
};

Form validation is done either by ID or name value of the slider component. Above ID of the slider is used to validate it.

Using slider name: Render slider with name attribute. In the following code snippet, name attribute value of slider is used for form validation.

// Slider element
<div id="default" name="slider"></div>

// sets required property in the FormValidator rules collection
let options: FormValidatorModel = {
  rules: {
'slider': {
  validateHidden: true,
  min: [6, "You must select value greater than 5"]
}
  }
};

Validate the form using validate method, and it validates the slider value with the defined rules collection and returns the result. If user selects the value less than the minimum value, form will not submit.

formObj.validate();

Slider validation can be done during value changes in slider. Refer to the following code snippet.

// change event handler for slider
function onChanged(args: any) {
  formObj.validate();
}

The FormValidator has following default validation rules, which are used to validate the Slider component.

Rules	Description	Example
`max`	Slider component must have value less than or equal to `max` number	if `max: 3`, 3 is valid and 4 is invalid
`min`	Slider component must have value greater than or equal to `min` number	if `min: 4`, 5 is valid and 2 is invalid
`regex`	Slider component must have valid value in `regex` format	if `regex: '/4/`, 4 is valid and 1 is invalid
`range`	Slider component must have value between `range` number	if `range: [4,5]`, 4 is valid and 6 is invalid

Source

Preview

index.jsx

index.html

index.css

index.tsx

import * as React from 'react';
import * as ReactDOM from "react-dom";
import { SliderComponent } from '@syncfusion/ej2-react-inputs';
import { FormValidator } from '@syncfusion/ej2-inputs';
function App() {
    React.useEffect(() => {
        componentDidMount();
    }, []);
    let ticks = { placement: "Before", largeStep: 20, smallStep: 5, showSmallTicks: true };
    let value = [30, 70];
    // sets required property in the FormValidator rules collection
    let minOptions = {
        rules: {
            "min-slider": {
                validateHidden: true,
                min: [40, "You must select value greater than or equal to 40"]
            }
        }
    };
    // sets required property in the FormValidator rules collection
    let maxOptions = {
        rules: {
            "max-slider": {
                validateHidden: true,
                max: [40, "You must select value less than or equal to 40"]
            }
        }
    };
    // sets required property in the FormValidator rules collection
    let valOptions = {
        rules: {
            "val-slider": {
                validateHidden: true,
                regex: [/40/, "You must select value equal to 40"]
            }
        }
    };
    // sets required property in the FormValidator rules collection
    let rangeOptions = {
        rules: {
            "range-slider": {
                validateHidden: true,
                range: [40, 80, "You must select values between 40 and 80"]
            }
        }
    };
    // sets required property in the FormValidator rules collection
    let customOptions = {
        rules: {
            "custom-slider": {
                validateHidden: true,
                range: [validateRange.bind(this), "You must select values between 40 and 80"]
            }
        }
    };
    // Initialize Form validation
    let formMinObj = null;
    let formMaxObj = null;
    let formValObj = null;
    let formRangeObj = null;
    let formCustomObj = null;
    function componentDidMount() {
        formMinObj = new FormValidator("#formMinId", minOptions);
        formMaxObj = new FormValidator("#formMaxId", maxOptions);
        formValObj = new FormValidator("#formValId", valOptions);
        formRangeObj = new FormValidator("#formRangeId", rangeOptions);
        formCustomObj = new FormValidator("#formCustomId", customOptions);
    }
    function onMinChanged(args) {
        // validate the slider value in the form
        formMinObj.validate();
    }
    function onMaxChanged(args) {
        // validate the slider value in the form
        formMaxObj.validate();
    }
    function onValChanged(args) {
        // validate the slider value in the form
        formValObj.validate();
    }
    function onRangeChanged(args) {
        // validate the slider value in the form
        formRangeObj.validate();
    }
    function onCustomChanged(args) {
        // validate the slider value in the form
        formCustomObj.validate();
    }
    let SliderCustomObj = null;
    function validateRange(args) {
        return (SliderCustomObj.value[0] >= 40 &&
            SliderCustomObj.value[1] <= 80);
    }
    return (<div id="container">
  <div className="col-lg-12 control-section">
    <div className="content-wrapper">
      <div className="form-title">
        <span>Min</span>
      </div>
      <form id="formMinId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent id="min-slider" name="min-slider" type="MinRange" value={30} ticks={ticks} changed={onMinChanged.bind(this)}/>
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Max</span>
      </div>
      <form id="formMaxId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent id="max-slider" name="max-slider" type="MinRange" value={30} ticks={ticks} changed={onMaxChanged.bind(this)}/>
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Value</span>
      </div>
      <form id="formValId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent id="val-slider" name="val-slider" type="MinRange" value={30} ticks={ticks} changed={onValChanged.bind(this)}/>
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Range</span>
      </div>
      <form id="formRangeId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent id="range-slider" name="range-slider" type="MinRange" value={30} ticks={ticks} changed={onRangeChanged.bind(this)}/>
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Custom</span>
      </div>
      <form id="formCustomId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent id="custom-slider" name="custom-slider" type="Range" value={value} ticks={ticks} changed={onCustomChanged.bind(this)} ref={slider => {
        SliderCustomObj = slider;
    }}/>
          </div>
        </div>
      </form>
    </div>
  </div>
</div>);
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));

<!DOCTYPE html>
<html lang="en">

<head>
            
    <title>Syncfusion React ListView</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-react-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.4.48/ej2-react-buttons/styles/material.css" rel="stylesheet" />
    <link href="index.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='element'>
    </div>
</body>

</html>

.highcontrast form {
  background: #000000
}

/* csslint ignore:start */
.highcontrast label.e-custom-label,
.highcontrast label.e-float-text,
.highcontrast label.salary,
.highcontrast input::placeholder,
.highcontrast .e-float-input label.e-float-text {
  color: #fff !important;
  line-height: 2.3;
}
/* csslint ignore:end */

.e-error,
.e-float-text {
  font-weight: 500;
}

table,
td,
th {
  padding: 5px;
}

.form-horizontal .form-group {
  margin-left: 0;
  margin-right: 0;
}

form {
  border: 1px solid #ccc;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.36);
  border-radius: 5px;
  background: #f9f9f9;
  padding: 23px;
  padding-bottom: 20px;
  margin: auto;
  max-width: 650px;
}

.form-title {
  width: 100%;
  text-align: center;
  padding: 10px;
  font-size: 16px;
  font-weight: 600;
  color: black;
}

import * as React from 'react';
import * as ReactDOM from "react-dom";
import { SliderComponent } from '@syncfusion/ej2-react-inputs';
import { FormValidator, FormValidatorModel } from '@syncfusion/ej2-inputs';
import { ButtonComponent } from '@syncfusion/ej2-react-buttons';

function App() {
React.useEffect(() => {
componentDidMount();
  }, []);
  let ticks: object ={ placement: "Before", largeStep: 20, smallStep: 5, showSmallTicks: true };
  let value: number[] = [30, 70];

  // sets required property in the FormValidator rules collection
  let minOptions: FormValidatorModel = {
rules: {
  "min-slider": {
    validateHidden: true,
    min: [40, "You must select value greater than or equal to 40"]
  }
}
  };

  // sets required property in the FormValidator rules collection
  let maxOptions: FormValidatorModel = {
rules: {
  "max-slider": {
    validateHidden: true,
    max: [40, "You must select value less than or equal to 40"]
  }
}
  };

  // sets required property in the FormValidator rules collection
  let valOptions: FormValidatorModel = {
rules: {
  "val-slider": {
    validateHidden: true,
    regex: [/40/, "You must select value equal to 40"]
  }
}
  };

  // sets required property in the FormValidator rules collection
  let rangeOptions: FormValidatorModel = {
rules: {
  "range-slider": {
    validateHidden: true,
    range: [40, 80, "You must select values between 40 and 80"]
  }
}
  };

  // sets required property in the FormValidator rules collection
  let customOptions: FormValidatorModel = {
rules: {
  "custom-slider": {
    validateHidden: true,
    range: [validateRange.bind(this), "You must select values between 40 and 80"]
  }
}
  };

  // Initialize Form validation
  let formMinObj: FormValidator = null as any;

  let formMaxObj: FormValidator = null as any;

  let formValObj: FormValidator = null as any;

  let formRangeObj: FormValidator = null as any;

  let formCustomObj: FormValidator = null as any;

  function componentDidMount(){
formMinObj = new FormValidator("#formMinId", minOptions);
formMaxObj = new FormValidator("#formMaxId", maxOptions);
formValObj = new FormValidator("#formValId", valOptions);
formRangeObj = new FormValidator("#formRangeId", rangeOptions);
formCustomObj = new FormValidator("#formCustomId", customOptions);
  }

  function onMinChanged(args: any): void {
// validate the slider value in the form
formMinObj.validate();
  }

  function onMaxChanged(args: any): void {
// validate the slider value in the form
formMaxObj.validate();
  }

  function onValChanged(args: any): void {
// validate the slider value in the form
formValObj.validate();
  }

  function onRangeChanged(args: any) {
// validate the slider value in the form
formRangeObj.validate();
  }

  function onCustomChanged(args: any) {
// validate the slider value in the form
formCustomObj.validate();
  }

  let SliderCustomObj: SliderComponent = null as any;

  function validateRange(args: any) {
return (
  (SliderCustomObj.value as number[])[0] >= 40 &&
  (SliderCustomObj.value as number[])[1] <= 80
);
  }

  return (
<div id="container">
  <div className="col-lg-12 control-section">
    <div className="content-wrapper">
      <div className="form-title">
        <span>Min</span>
      </div>
      <form id="formMinId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent
              id="min-slider"
              name="min-slider"
              type="MinRange"
              value={30}
              ticks={ticks}
              changed={onMinChanged.bind(this)}
            />
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Max</span>
      </div>
      <form id="formMaxId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent
              id="max-slider"
              name="max-slider"
              type="MinRange"
              value={30}
              ticks={ticks}
              changed={onMaxChanged.bind(this)}
            />
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Value</span>
      </div>
      <form id="formValId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent
              id="val-slider"
              name="val-slider"
              type="MinRange"
              value={30}
              ticks={ticks}
              changed={onValChanged.bind(this)}
            />
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Range</span>
      </div>
      <form id="formRangeId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent
              id="range-slider"
              name="range-slider"
              type="MinRange"
              value={30}
              ticks={ticks}
              changed={onRangeChanged.bind(this)}
            />
          </div>
        </div>
      </form>
      <div className="form-title">
        <span>Custom</span>
      </div>
      <form id="formCustomId" className="form-horizontal">
        <div className="form-group">
          <div className="e-float-input">
            <SliderComponent
              id="custom-slider"
              name="custom-slider"
              type="Range"
              value={value}
              ticks={ticks}
              changed={onCustomChanged.bind(this)}
              ref={slider => {
                SliderCustomObj = slider as any;
              }}
            />
          </div>
        </div>
      </form>
    </div>
  </div>
</div>
  );
}
export default App;
ReactDOM.render(<App />, document.getElementById('element'));

Please provide additional information

Thank you for your feedback and comments.We will rectify this as soon as possible!