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Validate the slider using FormValidator

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.js
index.html
index.css
// Initialize Slider component
var SliderMinObj = new ej.inputs.Slider({
    type: 'MinRange',
    value: 30,
    ticks: { placement: 'Before', largeStep: 20, smallStep: 5, showSmallTicks: true },
    changed: onMinChanged
});
SliderMinObj.appendTo("#min-slider");
// sets required property in the FormValidator rules collection
var minOptions = {
    rules: {
        'min-slider': {
            validateHidden: true,
            min: [40, "You must select value greater than or equal to 40"]
        }
    }
};
// Initialize Form validation
var formMinObj = new ej.inputs.FormValidator("#formMinId", minOptions);
function onMinChanged(args) {
    // validate the slider value in the form
    formMinObj.validate();
}
// Initialize Slider component
var SliderMaxObj = new ej.inputs.Slider({
    type: 'MinRange',
    value: 30,
    ticks: { placement: 'Before', largeStep: 20, smallStep: 5, showSmallTicks: true },
    changed: onMaxChanged
});
SliderMaxObj.appendTo("#max-slider");
// sets required property in the FormValidator rules collection
var maxOptions = {
    rules: {
        'max-slider': {
            validateHidden: true,
            max: [40, "You must select value less than or equal to 40"]
        }
    }
};
// Initialize Form validation
var formMaxObj = new ej.inputs.FormValidator("#formMaxId", maxOptions);
function onMaxChanged(args) {
    // validate the slider value in the form
    formMaxObj.validate();
}
// Initialize Slider component
var SliderValObj = new ej.inputs.Slider({
    type: 'MinRange',
    value: 30,
    ticks: { placement: 'Before', largeStep: 20, smallStep: 5, showSmallTicks: true },
    changed: onValChanged
});
SliderValObj.appendTo("#val-slider");
// sets required property in the FormValidator rules collection
var valOptions = {
    rules: {
        'val-slider': {
            validateHidden: true,
            regex: [/40/, "You must select value equal to 40"]
        }
    }
};
// Initialize Form validation
var formValObj = new ej.inputs.FormValidator("#formValId", valOptions);
function onValChanged(args) {
    // validate the slider value in the form
    formValObj.validate();
}
// Initialize Slider component
var SliderRangeObj = new ej.inputs.Slider({
    type: 'MinRange',
    value: 30,
    ticks: { placement: 'Before', largeStep: 20, smallStep: 5, showSmallTicks: true },
    changed: onRangeChanged
});
SliderRangeObj.appendTo("#range-slider");
// sets required property in the FormValidator rules collection
var rangeOptions = {
    rules: {
        'range-slider': {
            validateHidden: true,
            range: [40, 80, "You must select values between 40 and 80"]
        }
    }
};
// Initialize Form validation
var formRangeObj = new ej.inputs.FormValidator("#formRangeId", rangeOptions);
function onRangeChanged(args) {
    // validate the slider value in the form
    formRangeObj.validate();
}
// Initialize Slider component
var SliderCustomObj = new ej.inputs.Slider({
    type: 'Range',
    value: [30, 70],
    ticks: { placement: 'Before', largeStep: 20, smallStep: 5, showSmallTicks: true },
    changed: onCustomChanged
});
SliderCustomObj.appendTo("#custom-slider");
// sets required property in the FormValidator rules collection
var customOptions = {
    rules: {
        'custom-slider': {
            validateHidden: true,
            range: [validateRange, "You must select values between 40 and 80"]
        }
    }
};
// Initialize Form validation
var formCustomObj = new ej.inputs.FormValidator("#formCustomId", customOptions);
function onCustomChanged(args) {
    // validate the slider value in the form
    formCustomObj.validate();
}
function validateRange(args) {
    return SliderCustomObj.value[0] >= 40 && SliderCustomObj.value[1] <= 80;
}
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 Slider</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Essential JS 2 Slider Component">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <div class="col-lg-12 control-section">
            <div class="content-wrapper" style="margin-bottom: 25px;overflow-x: hidden">
                <div class="form-title">
                    <span>Min</span>
                </div>
                <form id="formMinId" class="form-horizontal">
                    <div class="form-group">
                        <div class="e-float-input">
                            <div id="min-slider" name="min-slider"></div>
                        </div>
                    </div>
                </form>
                <div class="form-title">
                    <span>Max</span>
                </div>
                <form id="formMaxId" class="form-horizontal">
                    <div class="form-group">
                        <div class="e-float-input">
                            <div id="max-slider" name="max-slider"></div>
                        </div>
                    </div>
                </form>
                <div class="form-title">
                    <span>Value</span>
                </div>
                <form id="formValId" class="form-horizontal">
                    <div class="form-group">
                        <div class="e-float-input">
                            <div id="val-slider" name="val-slider"></div>
                        </div>
                    </div>
                </form>
                <div class="form-title">
                    <span>Range</span>
                </div>
                <form id="formRangeId" class="form-horizontal">
                    <div class="form-group">
                        <div class="e-float-input">
                            <div id="range-slider" name="range-slider"></div>
                        </div>
                    </div>
                </form>
                <div class="form-title">
                    <span>Custom</span>
                </div>
                <form id="formCustomId" class="form-horizontal">
                    <div class="form-group">
                        <div class="e-float-input">
                            <div id="custom-slider" name="custom-slider"></div>
                        </div>
                    </div>
                </form>
            </div>
        </div>
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
    visibility: hidden;
}

#loader {
    color: #008cff;
    font-family: 'Helvetica Neue', 'calibiri';
    font-size: 14px;
    height: 40px;
    left: 45%;
    position: absolute;
    top: 45%;
    width: 30%;
}

.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;
}