Validation events in Vue Form validator component

16 Mar 20237 minutes to read

Validation events have two types of events. These are

• validationBegin
• validationComplete

Validation Begin

validationBegin event triggers before the validation starts and also it invoke for each rules in validation process. Please find the below code snippet.

validationBegin: function(args) {
        // ("Validation begin");
      },

The following values are passed in args. You can use this values in event validation.

Fields	Description
element	Specifies the input element
name	Specifies the event name (validationBegin)
param	Specifies the param value (true/false)
value	Specifies the input value

Validation Complete

validationComplete event triggered after validation is completed and also it invoke for each rules in validation process. Please find the below code snippet.

validationComplete: function(args) {
        // ("Validation complete");
      }

The following values are passed in args. You can use this values in event validation.

Fields	Description
element	Specifies the input element
name	Specifies the event name (validationComplete)
param	Specifies the param value (true/false)
value	Specifies the input value
status	Specifies the status (success/failure)
inputName	Specifies the type of input

Please find the simple sample for validation events.

app.vue

<template>
  <div class="wrap">

    <form id="form-element" class="form-horizontal">
      <div class="form-group">
        <div class="col-sm-3 control-label">Select Date</div>
        <div class="col-sm-6">
          <ejs-datepicker
            id="datepicker"
            name="date"
            class="form-control"
            placeholder="Select a date"
          ></ejs-datepicker>
          <div class="error-element"></div>
        </div>
      </div>

      <div id="list_event">
        <h4>
          <b>Event Trace</b>
        </h4>
        <div id="evt">
          <ul id="eList"></ul>
        </div>
      </div>
    </form>

    <div class="evtbtn">
      <ejs-button id="clear" @click.native="onClick">Clear</ejs-button>
    </div>
  </div>
</template>

<script>
import Vue from "vue";
import { DatePickerPlugin } from "@syncfusion/ej2-vue-calendars";
import { FormValidator } from "@syncfusion/ej2-vue-inputs";
import { queryParams } from "@syncfusion/ej2-base";
import { ButtonPlugin } from "@syncfusion/ej2-vue-buttons";
import { throws } from "assert";
Vue.use(DatePickerPlugin);
Vue.use(ButtonPlugin);

export default {
  name: "App",
  methods:{
     onClick: function(event) {
        document.getElementById("eList").innerHTML = "";
      },

  },
  mounted() {
    var options = {
      rules: {
        date: { required: true }
      },
      validationBegin: function(args) {
        this.appendElement("Validation begin <hr>");
      },
      appendElement: function(html) {
        let span = document.createElement("span");
        span.innerHTML = html;
        let log = document.getElementById("eList");
        log.insertBefore(span, log.firstChild);
      },
      customPlacement: function(element, errorElement) {
        document.querySelector(".error-element").appendChild(errorElement);
      },
      validationComplete: function(args) {
        if (args.status === "success") {
          this.appendElement("Validation complete success <hr>");
        } else {
          this.appendElement("Validation complete failure <hr>");
        }
      },
    };
    // defines FormValidator to validate the TimePicker
    var formObject = new FormValidator("#form-element", options);
  }
};
</script>

<style>
.wrap {
  margin-top: 10px;
}
.error-element {
  margin-top: 5px;
}
#list_event {
  margin-top: 60px;
  padding-left: 5px;
  min-width: 200px;
}

#evt {
  border: 1px solid #dcdcdc;
  padding: 10px;
  min-width: 10px;
}

.eventarea {
  min-width: 250px;
}

#EventLog b {
  color: #388e3c;
}

.evtbtn {
  margin-top: 40px;
  margin-left: 70px;
}
</style>

In the above code example, after completion of validation, the status of the validation process is passed as arguments to validationComplete method and the values are assigned according to the status of the validation.