validation - How to apply min/max attribute to v-model in Vue? -


current constraint of min , max not respected due way v-on implemented:

      <input id="passwordlength"              class="form-control form-control-sm"              type="number"              min="5"              max="35"              v-model="options.length">       <span class="input-group-btn" v-on:click="options.length+=1">         <button class="btn btn-secondary" type="button">           <i class="fa fa-plus"></i>         </button>       </span>

question

how can respect constrain , still keep elegant implementation?

you add custom modifier v-model directive:

// function gets min , max values element , prevents value of model going below min or above max function bindnumberinrange(el, binding, vnode) {   let model = binding.expression;   let min = parseint(el.min);   let max = parseint(el.max);   let val = parseint(binding.value);    if ((min !== nan) && (min >= val)) {     vnode.context[model] = min;   } else if ((max !== nan) && (max <= val)) {     vnode.context[model] = max;   }    el.value = val; }  // original reference v-model directive let modeldirective = vue.directive('model')  // set new definition of v-model directive vue.directive('model', {   bind: function(el, binding, vnode) {      // first fire original v-model bind hook     modeldirective.bind(el, binding, vnode);      if (binding.modifiers.range) {       bindnumberinrange(el, binding, vnode)     }   },   componentupdated: function(el, binding, vnode) {     // first fire original v-model componentupdated hook     modeldirective.componentupdated(el, binding, vnode);      if (binding.modifiers.range) {       bindnumberinrange(el, binding, vnode)     }   } })

then, need add .range modifier v-model when want model respect min , max attributes of affected element:

<input type="number" min="4" max="10" v-model.range="foo">

here's codepen example.

here's vue's (semi-lacking) documentation on directives.


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