11 replies to this topic

[marc_guga]

Boa tarde pessoal, estou começando agora com programação HTML+ASP
preciso de ajuda:

preciso fazer um form com três campos de texto (campo1 , campo2, campo3)
de modo que o usuario jogue o valor no campo1 e no campo2 e a pagina calcular
automaticamente o campo3 quando perder o foco do campo2...

agradeço desde já a possivel ajuda

Marcelo

[Alex Hiroshi]

Primeiro vc deve criar os camps

<input type="text" id="campo1" />
<input type="text" id="campo2" />
<input type="text" id="campo3" />

Dei um id para cada campo, vamos usar eles para pegar o valor de cada campo..

Vc quer que, ao sair do segundo campo, ele some o campo1 e o campo2.. e o resultado é mostrado no campo3. .
Para somar é facil, é igual matemática.. com o mais + . Para pegar o valor do campo um, vamos usar

document.getElementById('campo1').value

Para enviar o valor para o campo3, usamos a mesma coisa, vc só precisa mudar o id (a parte em negrito). . Então, fazendo a soma e enviando para o outro campo:

document.getElementById('campo3').value=document.getElementById('campo1').value+this.value

Essa linha vai enviar para o campo 3 o resultado da soma do campo 1 e 2. . repare que usei this.value para pegar o campo2.. isso pq essa linha vai ficar no campo2. .

Ah.. lembrando, para fazer isso funcionar, precisamos usar o evento onblur.. ele vai ser responsavel na por fazer a soma funcionar quando o campo perder o foco . .

<input type="text" id="campo1" />
<input type="text" id="campo2" onblur="document.getElementById('campo3').value=document.getElementById('campo1').value+this.value"/>
<input type="text" id="campo3" />

[marc_guga]

Cara, muito obrigado pela ajuda!!!

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