Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here's some tips to, at least, make your code more portable (dunno if it will be better performance wise, but should be, since DOM Manipulation is less expensive)</p> <h2>Tips</h2> <ol> <li>First separate your event handle from the HTML</li> <li>Pass the "new food" as a function paramater</li> <li>Tie the array elements to the DOM using the ID</li> <li>Instead of rerendering everything when something changes (using innerHTML in the list), just change the relevant bit</li> </ol> <h2>Benefits:</h2> <ol> <li>You actually only loop once (when removing elements from the array).</li> <li>You don't re-render the list everytime something changes, just the element clicked</li> <li>Added bonus: It's more portable.</li> <li>Should be faster</li> </ol> <h2>Example code:</h2> <p><a href="http://jsfiddle.net/tivie/WX7ZW/4/" rel="nofollow"><strong>FIDDLE</strong></a></p> <h3>HTML</h3> <pre><code>&lt;div id="eventBinder"&gt; &lt;!-- we add to our foodList from the value of the following input --&gt; &lt;input id="addFood" type="text" value="food" /&gt; &lt;!-- we call addToFood(); through the following button --&gt; &lt;button id="addFoodBtn" value="Add more to food"&gt;Add Food&lt;/button&gt; &lt;!-- The list of food is displayed in the following div --&gt; &lt;div id="foods"&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <h3>JS</h3> <pre><code>// FoodList Class var FoodList = function (selectorID) { return { foodArray: [], listEl: document.getElementById(selectorID), idCnt: 0, add: function (newFood) { var id = 'myfood-' + this.idCnt; this.foodArray.push({ id: id, food: newFood }); var foodDom = document.createElement('div'), foodText = document.createTextNode(newFood); foodDom.setAttribute('id', id); foodDom.setAttribute('class', 'aFood'); foodDom.appendChild(foodText); this.listEl.appendChild(foodDom); ++this.idCnt; }, remove: function (foodID) { for (var f in this.foodArray) { if (this.foodArray[f].id === foodID) { delete this.foodArray[f]; var delFood = document.getElementById(foodID); this.listEl.removeChild(delFood); } } } }; }; //Actual app window.myFoodList = new FoodList('foods'); document.getElementById('eventBinder').addEventListener('click', function (e) { if (e.target.id === 'addFoodBtn') { var food = document.getElementById('addFood').value; window.myFoodList.add(food); } else if (e.target.className === 'aFood') { window.myFoodList.remove(e.target.id); } }, false); </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POA good JavaScript to add/remove items from/to array?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USTivie
    1. USTivie
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThank you for the detailed answer. Unluckily it's beyond my current level. Yet, sooner or later I'll have to learn how to use classes.
      singulars
      1. PO
      1. USMenian Lee
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload