在javascript中检查伏阵

Question

i need little help with volt and javascript ( volt is templating for phalcon framework) i need to check html inputs with javascript, but problem appeared when i tried to generate 15input forms

                          {% if isset(image_keywords[i]) %}
                          {% set keyvalue = image_keywords[i] %}
                          <input type="text" class="keyWordLimit form-control input-sm" name="image_keywords[{{ i }}]" size="25" value="{{ value }}">
                          {% else %}
<input type="text" class="keyWordLimit form-control input-sm" name="image_keywords[{{ i }}]" size="25" value="">
                          {% endif %}
                      {% endfor %}

so how can i pass trough this javascript check

  if (frm.image_keywords.value == "") {
            alert("Please enter Keywords");
            frm.image_keywords.focus();
            return false;}

i tried with single input and it works well, but really dont understand how to deal with 15 inputs