Skip to main content

HTML: Cum sa facem disable un element din drop down.

Uneori avem nevoie pe UI sa facem un element dintr-un drop-down disable. Utilizatorul sa il poata vedea, dar sa nu il poata selecta. Aceasta varianta este foarte utila cand un update la o aplicatie deja existenta, unele optiuni dispar. Pana cand toti utilizatori o sa isi faca update la configuratie( backward compatibility).
Pe fiecare optine dintr-un select avem atributul disable ce care il putem seta. Pana aici totul pare in regula:
<select name="telefon">     <option value="1">Nokia</option>     <option value="2" disabled="disabled">LG</option>     <option value="3">Samsung</option></select>
Optiunea de LG nu o sa poata fi selectata, dar utilizatorul o poate vizualiza, iar din codul de java script se poate selecta aceasta valoare.
Ar aparea ceva de genul acesta:

Singura problema este cu IE. Acesta nu suporta acest atribut. Pentru a rezolva acest neajuns putem sa folosim urmatorul cod javascript:
<script>
function AddOptionsDisabledSupport(){
var allSelectItems = document.getElementsByTagName('select');
for(var i=0; i < allSelectItems.length; i++){
allSelectItems[i].onchange= function(){
if(this.options[this.selectedIndex].disabled){
if(this.options.length<=1){
this.selectedIndex = -1;
}else
if(this.selectedIndex < this.options.length - 1){
this.selectedIndex++;
}else{
this.selectedIndex--;
}
}
}

//Change the color to gray.
for(var j=0; j < allSelectItems[i].options.length; j++){
if(allSelectItems[i].options[j].disabled){
allSelectItems[i].options[j].style.color = '#CCC';
}
}
}
}

//Run each time when page is loaded.
window.attachEvent("onload", AddOptionsDisabledSupport)
</script>
Iar de acuma acest atribut o sa poata fi folosit si pe IE.

Comments

  1. Totusi, incepand cu IE >= 8.0, option disabled e suportat si de IE..

    ReplyDelete
  2. Acuma am vazut commentul, in seara asta pun si vs jquery.
    Doar ca nu tot timpul avem jquery la indemana.

    ReplyDelete

Post a Comment

Popular posts from this blog

How to audit an Azure Cosmos DB

In this post, we will talk about how we can audit an Azure Cosmos DB database. Before jumping into the problem let us define the business requirement: As an Administrator I want to be able to audit all changes that were done to specific collection inside my Azure Cosmos DB. The requirement is simple, but can be a little tricky to implement fully. First of all when you are using Azure Cosmos DB or any other storage solution there are 99% odds that you’ll have more than one system that writes data to it. This means that you have or not have control on the systems that are doing any create/update/delete operations. Solution 1: Diagnostic Logs Cosmos DB allows us activate diagnostics logs and stream the output a storage account for achieving to other systems like Event Hub or Log Analytics. This would allow us to have information related to who, when, what, response code and how the access operation to our Cosmos DB was done. Beside this there is a field that specifies what was th...

Cloud Myths: Cloud is Cheaper (Pill 1 of 5 / Cloud Pills)

Cloud Myths: Cloud is Cheaper (Pill 1 of 5 / Cloud Pills) The idea that moving to the cloud reduces the costs is a common misconception. The cloud infrastructure provides flexibility, scalability, and better CAPEX, but it does not guarantee lower costs without proper optimisation and management of the cloud services and infrastructure. Idle and unused resources, overprovisioning, oversize databases, and unnecessary data transfer can increase running costs. The regional pricing mode, multi-cloud complexity, and cost variety add extra complexity to the cost function. Cloud adoption without a cost governance strategy can result in unexpected expenses. Improper usage, combined with a pay-as-you-go model, can result in a nightmare for business stakeholders who cannot track and manage the monthly costs. Cloud-native services such as AI services, managed databases, and analytics platforms are powerful, provide out-of-the-shelve capabilities, and increase business agility and innovation. H...

Cloud Myths: Migrating to the cloud is quick and easy (Pill 2 of 5 / Cloud Pills)

The idea that migration to the cloud is simple, straightforward and rapid is a wrong assumption. It’s a common misconception of business stakeholders that generates delays, budget overruns and technical dept. A migration requires laborious planning, technical expertise and a rigorous process.  Migrations, especially cloud migrations, are not one-size-fits-all journeys. One of the most critical steps is under evaluation, under budget and under consideration. The evaluation phase, where existing infrastructure, applications, database, network and the end-to-end estate are evaluated and mapped to a cloud strategy, is crucial to ensure the success of cloud migration. Additional factors such as security, compliance, and system dependencies increase the complexity of cloud migration.  A misconception regarding lift-and-shits is that they are fast and cheap. Moving applications to the cloud without changes does not provide the capability to optimise costs and performance, leading to ...